Marley active mass. General technical conditions
Gauze medical description , quality, properties may be different, since there are several types of this product. It is worth noting that not all gauze can be used for medical purposes. Fabric for medical use referred to as gauze medical use This product is clear from its name.
What qualities and distinctive features does medical gauze have, and for what purposes is it used?
Medical gauze general description
The matter is intended for use for medical purposes. This is the main, but not the only area of its application.
This loose fabric with plain weave. The raw material for the production of the material is cotton. Due to the fact that the threads are located at a considerable distance from one another, the fabric is very light and transparent. This material is characterized by excellent hygroscopicity. This is achieved due to the unique structure of the fabric.
Medical gauze description of main characteristics:
- quickly absorbs moisture and retains it;
- does not leave lint on the surface being processed;
- excellent air permeability, which is very important for fast healing fabrics;
- can be reused, as it is easily washed and quickly wrung out, etc.
IN medical field bleached fabric is used. It can be either sterile or non-sterile. On the product labeling, medical gauze, the description must include this information. Material that has been sterilized is widely used in surgery, for treating damaged skin areas and for other medical purposes.
Bleaching, sterilization is carried out using safe methods without the use of chlorine. Thus, the fabric does not provoke allergies or irritation in the treated areas of the body.
The product is presented on the market various types. The product has certain density indicators, measured in grams per square meter. There are products with a density of 28, 32, 36 g/m2. The higher this parameter, the more expensive it is. Each type of canvas is designed for certain needs. In hospitals medical institutions Most often, a canvas with a density of 36 g/m2 is used.
According to GOST, products are wrapped in paper and bags. The product must contain information indicating the manufacturer, characteristics of density, whiteness, humidity and other qualities, and date of manufacture. The presence of holes, large tears, and dirty spots is not allowed.
Gauze for medical use
Medical gauze has very diverse uses. This is an indispensable consumable product in the medical industry due to its lightness, strength, and excellent ability to transmit oxygen, which promotes rapid healing. It is intended for dressings, stopping bleeding, drying wounds, eliminating purulent discharge, protecting damage from secondary contamination, and so on.
Gauze fabric is used to make various products:
- sections of certain sizes - 5, 10, 100, 200 meters;
- dressing;
- bandages, masks and others.
Due to its unique qualities, gauze fabric is used not only in the medical industry. Medical gauze has also found application in many areas of industry and is suitable for household needs.
In traumatology, a cloth with gypsum impregnation is used to fix injuries and fractures. Products impregnated with various medicines used as a medicinal product. The most common product made from fabric with healing impregnation is bactericidal wipes and tampons to stop bleeding.
Medical gauze description and application in other areas of industry:
- has excellent filtering properties, therefore it is used as a filter product;
- used as rags, wiping cloths, for cleaning dust and dirt;
- found application for industrial purposes for cleaning surfaces from oils and fuel oil;
- degreasing the surface before painting;
- in the furniture industry it plays the role of lining;
- for gluing books and so on.
Non-sterile products are often used in household and sanitary areas. It is used to care for children. It is often purchased as a cleaning fiber, as it has excellent absorbency, is easy to wring out, and dries quickly.
Sterile tissue is most often used in medical direction. It's thin, fat-free, processed special method textile. The product has sufficient softness and hygroscopicity.
There are many types of medical gauze on the market. What product to buy - lightweight gauze or fabric, corresponding to GOST, depends on personal needs.
TABLE OF CARGO PARAMETERS for calculating the cost of transportation |
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| Description of goods | vendor code | Density (g/sq.m.) | Roll length(m) | Roll width (m) | Roll height (m) | Roll volume (m³) | Roll weight (kg) | Approximate quantity per roll (m) |
| Bleached medical gauze | 6498 | 28 | 0,9 | 0,38 | 0,38 | 0,12 | 25,00 | 1000 |
| Bleached medical gauze | 6498 | 32 | 0,9 | 0,41 | 0,41 | 0,15 | 29,00 | 1000 |
| Bleached medical gauze | 6498 | 36 | 0,9 | 0,45 | 0,45 | 0,18 | 32,00 | 1000 |
(approved by Resolution of the State Standard of the Russian Federation dated January 18, 1995 N 6)
Revision dated 01/18/1995 - Valid from 01/01/1996
COMMITTEE OF THE RUSSIAN FEDERATION FOR STANDARDIZATION, METROLOGY AND CERTIFICATION
MEDICAL GAUGE GENERAL TECHNICAL CONDITIONS
Medical gauze. General specification
GOST 9412-93
Date of introduction 1996-01-01
Preface
1. Developed by the Central Scientific - research institute cotton industry (TsNIHBI).
2. Introduced by Gosstandart of Russia.
3. Adopted by the Interstate Council for Standardization, Metrology and Certification on March 15, 1994 (Report of the Technical Secretariat No. 1).
| State name | Name of the national standardization body |
| Republic of Azerbaijan | Azgosstandart |
| Republic of Belarus | Belstandart |
| The Republic of Kazakhstan | Gosstandart of the Republic of Kazakhstan |
| Republic of Kyrgyzstan | Kyrgyzstandard |
| The Republic of Moldova | Moldovastandard |
| Russian Federation | Gosstandart of Russia |
| Republic of Turkmenistan | Main State Inspectorate of Turkmenistan |
| Ukraine | State Standard of Ukraine |
4. By resolution of the Committee Russian Federation on standardization, metrology and certification dated January 18, 1995 N 6, the interstate standard GOST 9412-93 was put into effect directly as a state standard of the Russian Federation on January 1, 1996.
5. Instead of GOST 9412-77.
1 AREA OF USE
This standard applies to cotton and mixed gauze, with viscose fiber insertion, gauze and bleached gauze intended for the manufacture of dressings.
Mandatory requirements for product quality, aimed at ensuring its safety for the life and health of the population, are set out in accordance with 3.2.7.
2. REGULATORY REFERENCES
GOST 61-75 Acetic acid. Technical conditions.
GOST 1277-75 Silver nitrate.
GOST 3118-77 Hydrochloric acid. Technical conditions.
GOST 3760-79 Ammonia, aqueous. Technical conditions.
GOST 3773-72 Ammonium chloride. Technical conditions.
GOST 3811-72 Textile materials. Fabrics, non-woven fabrics and piece goods. Methods for determining linear dimensions, linear and surface densities.
GOST 3812-72 Textile materials. Fabrics and piece goods. Methods for determining the density of threads and pile tufts.
GOST 3813-72 Textile materials. Fabrics and piece goods. Methods for determining tensile tensile characteristics.
GOST 3816-81 Textile fabrics. Methods for determining hygroscopic and water-repellent properties.
GOST 4108-72 Barium chloride. Technical conditions.
GOST 4145-74 Potassium sulfate. Technical conditions.
GOST 4159-79 Iodine. Technical conditions.
GOST 4204-77 Sulfuric acid. Technical conditions.
GOST 4233-77 Sodium chloride.
GOST 4461-77 Nitric acid. Technical conditions.
GOST 4530-76 Calcium carbonate. Technical conditions.
GOST 5530-81 Fabrics for packaging and technical purposes. Technical conditions.
GOST 5712-78 Ammonium oxalate, 1-water. Technical conditions.
GOST 29227-91 Laboratory glassware. Graduated pipettes. Part 1. General requirements.
GOST 20490-75 Potassium permanganate. Technical conditions.
GOST 20566-75 Textile fabrics and piece goods. Acceptance rules and sampling method.
GOST 25336-82 Laboratory glassware and equipment. Types, main parameters and sizes.
GOST 25617-83 Linen, semi-linen, cotton and mixed fabrics and products. Chemical test methods.
3. REQUIREMENTS
3.1. Gauze must be produced in accordance with the requirements of this standard, technical descriptions and standard technological regimes approved in in the prescribed manner.
The gauze must be capable of producing finished gauze in accordance with the requirements of this standard.
3.2. Characteristics
3.2.1. Gauze must be made from cotton yarn in accordance with normative documentation for standardization and cotton viscose yarn in accordance with normative documentation for standardization.
3.2.2. Gauze for bandages should be produced in the following widths, cm:
severe - 72.5 +/- 1.5; 92 +/- 1.5; 97 +/- 1.5
bleached - 68 +/- 1.0; 84 +/- 1.5; 90 +/- 1.5.
By agreement between the manufacturer and the consumer, it is allowed to produce bleached gauze with a nominal width of more than 90 cm, except for gauze intended for the manufacture of bandages.
3.2.3. The length of gauze in a piece must be at least:
for severe - 200 m;
for bleached - 100 m.
The length of bleached gauze in a piece is allowed to be at least 20 m in an amount of no more than 10% of the batch.
The length of gauze in a roll should be:
for bleached - from 800 to 1300 m;
for severe - from 5000 to 8000 m.
Allowed for bleached gauze with a width of more than 90 cm, the length of gauze in a roll is from 500 to 1300 m.
In rolls of gauze intended for making bandages, unsewn pieces of gauze, as well as stitching gauze with different types of edges, are not allowed. The gauze is sewn using an overlock machine.
In places where two pieces of gauze are sewn together, the width can be reduced by 10 cm on each side. The seam is considered a conditional cut. The distance from the end of the piece or roll to the seam and between the seams should not be less than 10 m.
Pieces of gauze less than 10 m long are allowed, by agreement between the manufacturer and the consumer.
3.2.4. The breaking load of a strip of gauze measuring 50x200 mm should be, N(kgf) not less than:
for bleached:
Based on - 78.0 (8.0);
for severe:
Based on - 83.0 (8.5);
For duck - 44.0 (4.5).
3.2.5. The surface density of gauze should be, g/sq.m, not less than:
for bleached - 36;
for severe - 39.
3.2.6. Permissible deviations on the density surface must be at least minus 5%.
Permissible deviations in the number of threads per 10 cm should be,%:
for severe:
Based on - +/-2;
For duck - +/-3;
for bleached, not less than:
Based on - -2;
For duck - -3.
Plus permissible deviations in surface density and number of threads per 10 cm for bleached gauze are not limited.
3.2.7. In terms of physical and chemical indicators, bleached gauze must meet the requirements specified in Table 1.
Table 1
PHYSICO-CHEMICAL INDICATORS OF BLEACHED GAUGE
| Indicator name | Norm |
| Water extract reaction | Neutral |
| Mass fraction of chloride salts, %, no more | 0,02 |
| Mass fraction of sulfuric acid salts, %, no more | 0,02 |
| Mass fraction of calcium salts, %, no more | 0,06 |
| Time to determine the content of oxidizable substances, min, not less | 5 |
| Content of sizing agents | Not allowed |
| Content of coloring substances | Colorless hoods |
| Mass fraction of fatty substances, %, no more than Wettability, s, no more than: | 0,03 |
| for cotton gauze | 10 |
| for mixed gauze | 6 |
| Capillarity, cm/h, not less | 10 |
| Humidity,% | 5,0-8,5 |
| Ash content,% no more | 0,3 |
| Whiteness, %, not less | 80 |
| Degree of whiteness stability, %, no more | 10 |
| Note - The indicator of the degree of whiteness stability is determined by agreement between the manufacturer and the consumer for gauze intended for the manufacture of sterile dressings. | |
3.2.8. Two groups of defects are not allowed in gauze appearance:
defects of the 1st group - holes in the gauze background measuring more than 5 cm, oil and dirty stains, pulled edges more than 1 m along the length of the fabric;
defects of the 2nd group - undercuts of more than three threads, undercuts of the weft of more than three threads, undercuts of more than five threads, closeness of three or more threads, holes in the gauze background measuring no more than 5 cm, fringe along the edge more than 1.5 cm on one side and more than 2 cm on the other side.
3.2.8.1. Defects in appearance are determined by viewing the gauze in reflected or natural light on drying drums and stretching equipment.
3.2.8.2. Defects of the 1st group must be removed at the manufacturer.
Defects of the 2nd group are considered a conditional cut. The size of the conditional cutout should not exceed 30 cm along the length of the gauze. For a conventional length of a piece of 100 m, no more than six conventional cuts are allowed.
If the actual length of a piece or roll deviates from the conditional length, the number of conditional cuts (Py) per catch length of the piece is calculated using the formula:
| Pu = | Pf x 100 | (1) | |
| lf | |||
where Pf is the actual number of conditional cuts in a piece or roll;
lф - actual length of the piece or roll, m;
100 - conventional length of the piece, m.
The length of the conditional gauze cuts in general measure The length of a piece or roll is not included, but is taken into account as a weight flap.
3.2.8.3. Marks or stains of dye that cannot be washed off during bleaching are not allowed in harsh gauze.
3.2.9. IN technical description for a specific filling (article) of ready-made and harsh gauze should be installed the following indicators: composition of raw materials; linear density of yarn; number of threads per 10 cm in warp and weft; surface density; brand width; breaking load; weave.
Technical specifications for gauze used for military orders must be agreed upon with the customer.
3.2.10. By agreement between the manufacturer and the consumer, it is possible to establish additional requirements not provided for by this standard.
3.2.11. The gauze is folded into pieces or rolled into rolls of the entire width, evenly without distortions or drooping edges of the gauze.
Pieces of bleached gauze are folded into two folds. Packs are filled with two or three pieces of gauze and tied with twine in accordance with GOST 17308 or braid according to regulatory and technical documentation, across the pack in two places or crosswise. It is allowed to bandage packs of harsh gauze in four places (three transverse, one longitudinal bandaging).
3.3. Marking
3.3.1. The personal mark of the spreading equipment operator is applied to both ends of the piece or roll. rectangular shape 75x30 mm in size, located with the long side along the cut of the gauze at a distance of no more than 10 mm from the edge of the cut and from the edge of the gauze.
3.3.2. Each packaged roll, bundle or bale must be marked or labeled with indelible ink in a clear printed font indicating the following information:
name of gauze and article number;
total gauze length and article number;
total length of conditional cuts;
batch numbers;
release dates;
symbols of this standard.
3.4. Package
3.4.1. Packs of bleached gauze are wrapped in paper and tied with twine, then collected into bales weighing 80 kg and packed in packaging fabric in accordance with GOST 5530 or non-woven fabric in accordance with regulatory and technical documentation.
3.4.2. Rolls of bleached gauze are wrapped in paper and packing cloth.
By agreement between the manufacturer and the consumer, it is allowed to pack rolls of bleached gauze in paper and plastic film.
4. ACCEPTANCE RULES
4.1. Gauze is taken in batches. A batch is considered to be the number of rolls or packs of gauze of the same name, article number and type of finish, documented in one quality document.
Each batch of gauze is accompanied by a quality document indicating the following data:
name of the manufacturer and its trademark;
gauze names and article numbers;
gauze quality assessment results;
designation of this standard;
batch numbers;
number of rolls or bales in a batch.
4.2. All rolls or packs of the batch are subject to verification of compliance of the correct packaging and labeling with the requirements of this standard.
4.3. To check the quality of gauze according to physical-mechanical, physical-chemical indicators and linear dimensions, three rolls or packs are selected from the batch.
Determination of the mass fraction of fatty substances and ash content should be carried out on every 10th batch.
4.4. For defects in appearance, the manufacturer checks 100% of the products, the consumer - 3% of rolls or packs from the batch, but not less than three rolls or packs.
4.5. If unsatisfactory test results are obtained for at least one indicator, a double check of the double number of rolls (packs) selected from the same batch is carried out.
The result of the re-inspection applies to the entire batch.
5. TEST METHODS
5.1. Sampling - according to GOST 20566.
5.2. The samples taken must be kept unfolded in climatic conditions according to GOST 10681 at least 12 hours.
5.3. Determination of linear dimensions and surface density - according to GOST 3811.
5.4. Determination of the number of threads per 10 cm - according to GOST 3812.
5.5. Determination of breaking load - according to GOST 3813.
5.6. Determination of whiteness and degree of whiteness stability - according to GOST 18054.
5.7. Determination of humidity and capillarity - according to GOST 3816, with the following addition: capillarity is determined in a draft-free room or in a closed cabinet.
5.8. Determination of the mass fraction of fatty substances and the mass fraction of viscose fiber - according to GOST 25617.
5.9. Determination of the reaction of aqueous extract
5.9.1. Carrying out the test
From each point sample taken from the batch, three elementary samples weighing 5 g each are cut out, combined, and poured into 150 cubic meters. cm of distilled water and boil for 15 minutes. Then squeeze with a glass rod. The liquid is poured into a clean container and cooled to room temperature.
The reaction of the aqueous extract is determined using universal indicator paper or bromithymol blue. The reaction of the water extract should be neutral.
5.10. Determination of the mass fraction of chloride salts
5.10.1. To determine the mass fraction of chloride salts, use a solution of an aqueous extract obtained in accordance with 5.9.
5.10.2. Equipment and reagents
Desiccator according to GOST 25336.
Flasks with a capacity of 1000 cubic meters. cm according to GOST 25336.
Pipettes according to GOST 29227.
Sodium chloride according to GOST 4233.
Water hood 10 cubic meters cm.
Silver nitrate according to GOST 1277 solution with a mass fraction of 2%.
Nitric acid according to GOST 4461 solution with a mass fraction of 10%.
5.10.3. Preparing for the test
Solution A. To prepare a sample solution A of chlorine ion in a volumetric flask with a capacity of 1000 cubic meters. m dissolve 0.659 g of slightly calcined sodium chloride and bring the volume of the solution to the mark with distilled water. 25 cu. cm of solution A is diluted to 1000 cc. cm and obtain a model solution - solution B, containing 0.01 mg of chlorine ion in 1 cubic meter. cm or 0.001%.
5.10.4. Carrying out the test
K 10 cu. cm of water extract add 0.5 cubic meters. cm nitric acid solution, 0.5 cc. cm of silver nitrate solution and mix. At the same time to 10 cubic meters. cm of sample solution B add 0.5 cc. cm solutions of nitric acid and silver nitrate and mix. After 5 minutes, both solutions are compared. The resulting solution is considered to comply with the requirements of this standard if its opalescence does not exceed the opalescence of the reference solution.
5.11. Determination of the mass fraction of sulfuric acid salts
5.11.1. To determine the mass fraction of sulfuric acid salts, use a solution of an aqueous extract obtained according to 5.9.
5.11.2. Equipment, reagents and solutions
Drying cabinet providing drying temperature (107 +/- 2) degrees C.
Volumetric flasks with a capacity of 1000 cubic meters. cm according to GOST 25336.
Pipettes according to GOST 29227.
Barium chloride according to GOST 4108, solution with a mass fraction of 5%.
Potassium sulfate according to GOST 4145.
Water hood 10 cubic meters cm.
5.11.3. Preparing for the test
Solution A. To prepare a sample solution A, sulfate ion in a 1000 cubic meter volumetric flask. cm dissolve 1.814 g of potassium sulfate, dried at 100-105 degrees. C to constant weight and bring the volume of the solution to the mark with distilled water. 10 cu. cm of solution A is diluted with distilled water to 1000 cubic meters. cm and obtain a model solution B containing 0.01 mg of sulfate ion in 1 cubic meter. cm or 0.001%.
5.11.4. Carrying out the test
K 10 cu. cm of water extract add 0.5 cubic meters. cm solution of hydrochloric acid, 1 cu. cm of barium chloride solution and stir. At the same time to 10 cubic meters. cm of sample solution B add 0.5 cc. cm hydrochloric acid solution, 1 cu. cm of barium chloride solution and stir. After 20 minutes, both solutions are compared. The resulting solution is considered to comply with the requirements of this standard if its turbidity does not exceed that of the reference standard.
5.12. Determination of the mass fraction of calcium salts
5.12.1. To determine the mass fraction of calcium salts, use a solution of an aqueous extract obtained in accordance with 5.9.
5.12.2. Equipment, reagents and solutions
Measuring flasks with a capacity of 100, 1000 cubic meters. cm according to GOST 25336.
Analytical balances.
Drying cabinet providing drying temperature (107 +/- 2) degrees. WITH.
Desiccator according to GOST 25336.
Weighing cups (bugs) in accordance with GOST 25336.
Pipettes according to GOST 29227.
Test tubes according to GOST 25336.
Aqueous ammonia according to GOST 3760, solution with a mass fraction of 10%.
Ammonium chloride according to GOST 3773, solution with a mass fraction of 10%.
Ammonium oxalate according to GOST 5712, solution with a mass fraction of 4%.
Calcium carbonate according to GOST 4530.
Hydrochloric acid according to GOST 3118, solution with a mass fraction of 10%.
Water hood 10 cubic meters cm.
5.12.3. Preparing for the test
Solution A. To prepare standard solution A calcium - ion, weigh 0.749 g of calcium carbonate, dried at 100-105 degrees. To constant mass, mix in a 100 cc volumetric flask. cm with 10 cu. cm of water. Then a solution of hydrochloric acid is gradually added to the flask until calcium carbonate is completely dissolved and after the bubbles disappear carbon dioxide bring the volume of solution to the mark with distilled water. 10 cu. cm of solution A is diluted with distilled water to 1000 cubic meters. cm and obtain a model solution B containing 0.03 mg of calcium ion in 1 cubic meter. cm or 0.003%.
5.12.4. Testing
K 10 cu. cm of water extract add 1 cu. cm ammonium chloride solution, 1 cu. cm of ammonia solution and 1 cu. cm ammonium oxalate solution and stir. At the same time to 10 cubic meters. cm of sample solution B add 1 cc. cm ammonium chloride solution, 1 cu. cm of ammonia solution and 1 cu. cm ammonium oxalate and mix. After 10 minutes, both solutions are compared. The test solution is considered to comply with the requirements of this standard if its turbidity does not exceed the turbidity of the reference solution.
5.13. Determination of the content of oxidizable substances
5.13.1. Reagents
Potassium permanganate according to GOST 20490, solution with a mass fraction of 0.02 mol/cub. dm.
Sulfuric acid according to GOST 4204, solution with a mass fraction of 10%.
5.13.2. Carrying out the test
K 10 cu. cm of aqueous extract, add 3-5 drops of diluted sulfuric acid and 3 drops of potassium permanganate solution. Received weak staining The liquid should not disappear within 5 minutes.
5.14. Determination of the content of sizing substances
K 10 cu. cm of aqueous extract, add one drop of iodine solution according to GOST 4159 with a mass fraction of 0.5 mol/cub. dm. Blue or light blue dyeing is not permitted.
5.15. Determination of the content of coloring substances
A glass with a diameter of no more than 5 cm is placed on white paper and 50 cubic meters is poured into it. cm of water extract and 5 cu. cm acetic acid according to GOST 61. Acidified and neutral extracts should not be painted. The color intensity is determined by the vertical layer of liquid.
5.16. Determination of ash content
5.16.1. Carrying out the test
Two elementary samples of gauze, dried during determination of humidity, are burned until complete combustion in porcelain crucibles, previously brought to a constant mass.
5.16.2. Processing the results
Ash content (3) as a percentage is calculated using the formula
| Z = | m1 x 100 | (2) | |
| m2 | |||
m2 is the mass of an elementary sample of gauze after drying, g.
Calculations are carried out to the third decimal place and rounded to the second decimal place. The arithmetic mean of the results of two determinations is taken as the final result.
5.17. Determination of wettability
From each gauze sample being tested, two elementary samples, each 5x5 cm in size, are cut out and, using tweezers, lowered in a straightened form onto the surface of distilled water at a temperature of 20 degrees C.
The width of the vessel should prevent the samples from touching its walls. Samples should be immersed in water no later than 10 s for cotton gauze and 6 s for mixed gauze.
6. TRANSPORTATION AND STORAGE
Transportation and storage of gauze - in accordance with GOST 7000.
On the shelves of pharmacies you can find various products, including the simplest ones, such as plasters, bandages and regular gauze. But few people know that this product must meet certain requirements in order to fully perform its functions. All medical institutions purchase only those products that comply with GOST. Let's look at what medical gauze is (GOST 9412-93), find out its technical characteristics, and also give detailed description.
What kind of medical gauze is it (description)?
Medical gauze - GOST 9412-93 - is a non-sterile or sterile piece, which in most cases is found in pharmacies in individual packaging. It is often used for dressings, fixing cotton swabs, and other medical products.
Medical gauze rolls are bleached cotton, it looks like lightweight fabric made of cotton material and has a high degree of hygroscopicity (the ability to absorb moisture). Such a product is developed specifically for a variety of medical purposes as a basis for dressings that can be presented cotton-gauze bandages, bandages, napkins, bandages, tampons, masks. The main purpose of such products is protection against infectious agents.
Both the medical gauze itself and the products based on it fully comply with GOST 9412-93. They may differ slightly only in the density of such material.
Thus, gauze (the word itself came to us from the French language and literally means muslin) is a very light, transparent, loose and at the same time hygroscopic cotton fabric, which is characterized by a plain weave. It is made up of sparsely woven threads (having a simple weave) and is usually colored White color.
Non-sterile gauze is a fairly popular product; it is often used as a wiping material, because such material is characterized by mass useful qualities. It is able to quickly and effectively absorb liquids, it can be easily wrung out and dried quickly. Thanks to such qualities, gauze was found wide application in the household and in various sanitary works. It is also actively used in production, for example, bleached gauze is used in paint shops for effective cleaning surfaces and dirt. In production shops, such material is used to remove oil and subsequently degrease surfaces, for example, for painting.
Bleached medical gauze is used to create a number of surgical dressings, and it is prepared exclusively from cotton yarn, adhering to modern technologies.
Gauze GOST 9412-93 can also be sterile, in which case it is bleached without the use of chlorine and its various components. Thanks to this, the resulting canvas is not capable of provoking allergic reactions during contact with damaged skin. Sterile gauze is used to prepare most medical products.
Medical gauze - technical characteristics
Thus, medical gauze meets a number of requirements. It is characterized by excellent capillary and hemostatic properties. Due to its wide size range, it is actively used in both pediatric and adult therapeutic practice.
As for the technical characteristics, according to GOST 9412-93, medical gauze must have a whiteness of at least 80%, its wettability must not exceed 10.0c, and its breaking load must be equal to N-78. The sterile gauze should not show any visual defects or large holes in the fabric. In addition, there should be no stains on it, and no shortage of more than three threads in a row in the weave.
Medical gauze - GOST 9412-93 - has a certain width - ninety centimeters. It is usually sold in rolls of a thousand meters, or in sections of two to ten meters.
Additional Information
Sterile gauze is used to prepare various medical raw materials. So, on its basis, a gauze bandage is prepared, which is essentially a narrow and long single-layer strip of gauze, from six to fifteen centimeters wide, rolled into a tube.
Gauze is also used to create gauze swab(napkins). This type of structure is usually used during surgical interventions in order to eliminate excess moisture in the desired areas. This group of products must be especially high quality, because their components are constantly in contact with liquids human body and can cause infection.
Gauze can also be purchased in the form of a cut; such material is already used in the hospital to form bandages and tampons intended to be in direct contact with the wound. Quite often, gauze cuts are used for dressing large-area wounds and burn lesions. Thanks to the pressed edges of the cut, the gauze contacts the body especially gently, which helps reduce the intensity painful sensations.
Thus, bleached cotton gauze is actually a universal surgical dressing material that is actively used in different areas medicine, represented by surgery, dentistry, obstetrics, traumatology, etc. It is worth noting that for household needs it is worth using non-sterile gauze, it is cheaper and more practical.
Ekaterina, www.site
P.S. The text uses some forms characteristic of oral speech.
One material that is well suited for “wiping” is gauze. But gauze, like any other fabric, has its own characteristics. Next I'll tell you what type of gauze is there?, its types and characteristics.
The gauze is harsh
Severe gauze or sometimes called technical gauze is the basis for the production of any other gauze. Initially, it usually has a yellowish tint and is used only in enterprises to wipe away dirt, dust and various liquids.
Technical equipment is made from harsh gauze. bleached gauze And medical gauze. For the latter, according to GOST, harsh gauze with a density of at least 39 g/m2 must be used. The width of a roll of gauze is basically 92 cm. In general, there is nothing more to note here, good material, with high hygroscopicity, is made from 100% cotton, but it is rare to find it, as it is essentially a raw material for the production of bleached gauze.
Bleached gauze characteristics
Sometimes it is believed that bleached gauze is medical, but in fact this is not the case. And technical bleached gauze differs from medical gauze, first of all, in density; it is different for all manufacturers, and below I will give standard densities that can be found on the market.
Density of technical gauze bleached:
- 25 g/m2 is the minimum density that can be found; sometimes it is passed off as gauze with a density of 26 g/m2 or higher. Used as the cheapest option.
- 26 g/m2 - more common, not much different from 25 g/m2, this gauze is widely used as a cleaning material.
- 28 g/m2 - such gauze, as far as I know, does not exist, however, gauze with a density of 26 g/m2 is sometimes passed off as it.
- 32 g/m2 is also a fairly popular type of gauze; in addition to “wiping”, it is used as filters for liquids, and is also often passed off as medical gauze. 🙂 This gauze is already much denser.
- 34 g/m2 - sometimes found.
Density, of course, also affects the price; accordingly, the lower the density, the lower the price, and the higher, the more expensive.
On the left is gauze with a density of 26 g/m2, on the right 32 g/m2
The next characteristic of gauze is the width of the roll. On this moment Bleached gauze is produced in a width of 90 cm, in any case this is the most popular width and I have never seen another. The width is generally standard and there’s not even anything to say here; the next point is much more important.
An important parameter is how many meters are wound on the roll. It is important because it also affects the price, but unlike density, there is a different relationship here: the fewer linear meters in a roll, the more expensive the gauze.
The standard winding per roll is 1000 linear meters. and 200 linear meters In addition to rolls, they also sell gauze cuts of 1, 3, 5, 10 linear. m., they are usually folded and packaged in a transparent bag.
You can also say that rolls of gauze come with or without a sleeve, this usually does not affect the price
Bleached medical gauze technical characteristics
This gauze is taken out a separate item, since not all bleached gauze can be considered medical, or rather, bandages and medical napkins are made from any bleached gauze (of course, differing in quality), but medical gauze that meets all standards has certain indicators. So, what kind of gauze can be considered medical, in accordance with GOST 9412-93, we read further.
Density of medical gauze according to GOST, it should be no lower than 36 g/m2, but in fact, gauze with a density of 32 g/m2 is sometimes passed off as gauze (fortunately, there are fewer and fewer unscrupulous sellers on the market). A roll width of 90 cm is also popular and medical gauze with a width of 84 cm is much less common. Winding in rolls is the same for 1000 and 200 meters. And also gauze cuts of 1, 3, 5, 10 (in fact, manufacturers can make pieces of any size to order, but these are standard).
But everything that is written above concerns non-sterile medical gauze, in order to become sterile it is additionally sterilized. There are several types of sterilization, but the main ones are hot air treatment, with high temperature up to 200 degrees or autoclave treatment at elevated temperatures and pressure.
The range of applications for medical gauze is somewhat different; it is rarely used for cleaning purposes, since it is more expensive and is mainly used for its intended purpose (for the manufacture of dressings). Gauze bandages and swabs are widely used in medicine and various laboratories. Medical gauze is also good for filtration. various liquids, including in production.
Gauze with a density of 52 g/m2
Another type of gauze is used much less frequently compared to other types, as it is more expensive. And the scope of application is mainly as filters.
In conclusion…
I would also like to note that gauze scraps from production (rejects, both raw and bleached gauze) are pressed and packaged into briquettes of 10 kg, thus obtaining. Below are photos of medical gauze, bleached technical gauze and harsh gauze with comments.
Photo of bleached gauze
On the left is gauze with a density of 26 g/m2, on the right 30 g/m2
GOST 9412-93
Group P12
INTERSTATE STANDARD
MEDICAL GAUGE
Are common specifications
Medical gauze.
General specifications
ISS 11.120.20
OKP 93 9370
Date of introduction 1996-01-01
Preface
1 DEVELOPED by the Central Scientific Research Institute of the Cotton Industry (TSNIHBI)
2 INTRODUCED by Gosstandart of Russia
3 ADOPTED by the Interstate Council for Standardization, Metrology and Certification on March 15, 1994 (Report of the Technical Secretariat No. 1)
The following voted for adoption:
State name | Name of the national authority |
Republic of Azerbaijan | Azgosstandart |
Republic of Belarus | Belstandart |
The Republic of Kazakhstan | Gosstandart of the Republic of Kazakhstan |
Republic of Kyrgyzstan | Kyrgyzstandard |
The Republic of Moldova | Moldovastandard |
Russian Federation | Gosstandart of Russia |
Republic of Turkmenistan | Main State Inspectorate of Turkmenistan |
Ukraine | State Standard of Ukraine |
4 By Decree of the Committee of the Russian Federation on Standardization, Metrology and Certification dated January 18, 1995 No. 6, the interstate standard GOST 9412-93 was put into effect directly as the state standard of the Russian Federation on January 1, 1996.
5 INSTEAD GOST 9412-77
6 REPUBLICATION. August 2003
1 area of use
1 area of use
This standard applies to cotton and mixed gauze, with viscose fiber insertion, gauze and bleached gauze intended for the manufacture of dressings.
Mandatory requirements for product quality, aimed at ensuring its safety for the life and health of the population, are set out in accordance with 3.2.7.
2 Normative references
This standard uses references to the following standards:
GOST 61-75 Acetic acid. Specifications
GOST 1277-75 Silver nitrate. Specifications
GOST 3118-77 Hydrochloric acid. Specifications
GOST 3760-79 Ammonia, aqueous. Specifications
GOST 3773-72 Ammonium chloride. Specifications
GOST 3811-72 (ISO 3801-77, ISO 3932-76, ISO 3933-76) Textile materials. Fabrics, non-woven fabrics and piece goods. Methods for determining linear dimensions, linear and surface densities
GOST 3812-72 Textile materials. Fabrics and piece goods. Methods for determining the density of threads and pile bundles
GOST 3813-72 (ISO 5081-77, ISO 5082-82) Textile materials. Fabrics and piece goods. Methods for determining tensile tensile characteristics
GOST 3816-81 (ISO 811-81) Textile fabrics. Methods for determining hygroscopic and water-repellent properties
GOST 4108-72 Barium chloride 2-water. Specifications
GOST 4145-74 Potassium sulfate. Specifications
GOST 4159-79 Iodine. Specifications
GOST 4204-77 Sulfuric acid. Specifications
GOST 4233-77 Sodium chloride. Specifications
GOST 4461-77 Nitric acid. Specifications
GOST 4530-76 Calcium carbonate. Specifications
GOST 5530-81* Fabrics for packaging and technical purposes. Specifications
________________
* GOST 5530-2004 is in force on the territory of the Russian Federation. Here and further. - Database manufacturer's note.
GOST 5712-78 Ammonium oxalate, 1-water. Specifications
GOST 6709-72 Distilled water. Specifications
GOST 7000-80 Textile materials. Packaging, labeling, transportation and storage
GOST 10681-75 Textile materials. Climatic conditions for conditioning and testing samples and methods for their determination
GOST 17308-88 Twines. Specifications
GOST 18054-72 (ISO 105-J02-87) Textile materials. Whiteness determination method
GOST 20490-75 Potassium permanganate. Specifications
GOST 20566-75 Textile fabrics and piece goods. Acceptance rules and sampling method
GOST 25336-82 Laboratory glassware and equipment. Types, main parameters and sizes
GOST 25617-83 Linen, semi-linen, cotton and mixed fabrics and products. Chemical test methods
GOST 29227-91 (ISO 835-1-81) Laboratory glassware. Graduated pipettes. Part 1. General requirements
3 Requirements
3.1 Gauze must be produced in accordance with the requirements of this standard, technical descriptions and standard technological modes approved in the prescribed manner.
The gauze must be capable of producing finished gauze in accordance with the requirements of this standard.
3.2 Characteristics
3.2.1 Gauze must be made from cotton yarn in accordance with normative documentation for standardization and cotton viscose yarn in accordance with normative documentation for standardization.
3.2.2 Gauze for bandages should be produced in the following widths, cm:
severe - 72.5±1.5; 92±1.5; 97±1.5;
bleached - 68±1.0; 84±1.5; 90±1.5.
By agreement between the manufacturer and the consumer, it is allowed to produce bleached gauze with a nominal width of more than 90 cm, except for gauze intended for the manufacture of bandages.
3.2.3 The length of the gauze in a piece must be at least:
for severe - 200 m;
for bleached - 100 m.
The length of bleached gauze in a piece is allowed to be at least 20 m in an amount of no more than 10% of the batch.
The length of gauze in a roll should be:
for bleached - from 800 to 1300 m;
for severe - from 5000 to 8000 m.
Allowed for bleached gauze with a width of more than 90 cm, the length of gauze in a roll is from 500 to 1300 m.
In rolls of gauze intended for making bandages, unsewn pieces of gauze, as well as stitching gauze with different types of edges, are not allowed. The gauze is sewn using an overlock machine.
In places where two pieces of gauze are sewn together, the width can be reduced by 10 cm on each side. The seam is considered a conditional cut. The distance from the end of the piece or roll to the seam and between the seams should not be less than 10 m.
Pieces of gauze less than 10 m long are allowed, by agreement between the manufacturer and the consumer.
3.2.4 The breaking load of a strip of gauze measuring 50x200 mm must be, N (kgf) not less than:
for bleached:
- based on - 78.0 (8.0);
- for duck - 34.0 (3.5);
for severe:
Based on - 83.0 (8.5);
- for duck - 44.0 (4.5).
3.2.5 The surface density of gauze must be, g/m, not less than:
for bleached - 36;
for severe - 39.
3.2.6 Permissible deviations in surface density must be at least minus 5%.
Permissible deviations in the number of threads per 10 cm should be, %:
for severe:
- on the basis - ±2;
- for duck - ±3;
for bleached, not less than:
- based on - -2;
- for duck - -3.
Plus permissible deviations in surface density and number of threads per 10 cm for bleached gauze are not limited.
3.2.7 In terms of physical and chemical parameters, bleached gauze must meet the requirements specified in Table 1.
Table 1 - Physico-chemical parameters of bleached gauze
Indicator name | |
Water extract reaction | Neutral |
Mass fraction of chloride salts, %, no more | |
Mass fraction of sulfuric acid salts, %, no more | |
Mass fraction of calcium salts, %, no more | |
Time to determine the content of oxidizable substances, min, not less | |
Not allowed |
|
Colorless hoods |
|
Mass fraction of fatty substances, %, no more | |
Wettability, s, no more: | |
for cotton gauze | |
for mixed gauze | |
Capillarity, cm/h, not less | |
Humidity, % | |
Ash content, %, no more | |
Whiteness, %, not less | |
Degree of whiteness stability, %, no more | |
Note - The indicator of the degree of whiteness stability is determined by agreement between the manufacturer and the consumer for gauze intended for the manufacture of sterile dressings. |
|
3.2.8 Two groups of defects in appearance are not allowed in gauze:
defects of the 1st group - holes in the background of the gauze measuring more than 5 cm, oil and dirty stains, a pulled edge of more than 1 m along the length of the fabric;
defects of the 2nd group - undercuts of more than three threads, undercuts of the weft of more than three threads, undercuts of more than five threads, closeness of three or more threads, holes in the gauze background measuring no more than 5 cm, fringe on the edge of more than 1.5 cm on one side and more than 2 cm on the other side.
3.2.8.1 Defects in appearance are determined by viewing the gauze in reflected or natural light on drying drums and stretching equipment.
3.2.8.2 Defects of the 1st group must be cut out at the manufacturer.
Defects of the 2nd group are considered a conditional cut. The size of the conditional cutout should not exceed 30 cm along the length of the gauze. For a conventional length of a piece of 100 m, no more than six conventional cuts are allowed.
If the actual length of a piece or roll deviates from the conditional length, the number of conditional cuts per conditional length of the piece is calculated using the formula
where is the actual number of conditional cuts in a piece or roll;
- actual length of the piece or roll, m;
- conditional length of the piece, m.
The length of the conventional cuts of gauze is not included in the overall measure of the length of a piece or roll, but is taken into account as a weight flap.
3.2.8.3 Marks or stains of dye that cannot be washed off during bleaching are not allowed in gray gauze.
3.2.9 In the technical description for a specific filling (article) of finished and gauze, the following indicators must be established: composition of raw materials; linear density of yarn; number of threads per 10 cm in warp and weft; surface density; brand width; breaking load; weave.
Technical specifications for gauze used for military orders must be agreed upon with the customer.
3.2.10 By agreement between the manufacturer and the consumer, it is possible to establish additional requirements not provided for by this standard.
3.2.11 Gauze is folded into pieces or rolled into rolls to the full width evenly without distortions or drooping edges of the gauze.
Pieces of bleached gauze are folded into two folds. Packs are filled with two or three pieces of gauze and tied with twine in accordance with GOST 17308 or with braid according to ND across the pack in two places or crosswise. It is allowed to bandage packs of harsh gauze in four places (three transverse, one longitudinal bandaging).
3.3 Marking
3.3.1 On both ends of the piece or roll, apply the personal mark of the operator of the rectangular stretching equipment measuring 75x30 mm, located with the long side along the cut of the gauze at a distance of no more than 10 mm from the edge of the cut and from the edge of the gauze.
3.3.2 Each packaged roll, bundle or bale must be clearly printed or marked with indelible ink indicating the following information:
total length of gauze in a pack, bale or roll;
total length of conditional cuts;
batch numbers;
release dates;
symbols of this standard.
3.4 Packaging
3.4.1 Packs of bleached gauze are wrapped in paper and tied with twine, then collected into bales weighing 80 kg and packed in packaging fabric in accordance with GOST 5530 or non-woven fabric in accordance with ND.
3.4.2 Rolls of bleached gauze are wrapped in paper and packing cloth.
By agreement between the manufacturer and the consumer, it is allowed to pack rolls of bleached gauze in paper and plastic film.
4 Acceptance rules
4.1 Gauze is taken in batches. A batch is considered to be the number of rolls or packs of gauze of the same name, article number and type of finish, documented in one quality document.
Each batch of gauze is accompanied by a quality document indicating the following data:
name of the manufacturer and its trademark;
gauze names and article numbers;
gauze quality assessment results;
symbols of this standard;
batch numbers;
number of rolls or bales in a batch.
4.2 All rolls or packs of the batch are subject to verification of compliance of the correct packaging and labeling with the requirements of this standard.
4.3 To check the quality of gauze according to physical-mechanical, physical-chemical parameters and linear dimensions, three rolls or packs are selected from the batch.
Determination of the mass fraction of fatty substances and ash content should be carried out on every 10th batch.
4.4 For defects in appearance, the manufacturer checks 100% of the products, the consumer - 3% of rolls or packs from the batch, but not less than three rolls or packs.
4.5 If unsatisfactory inspection results are obtained for at least one indicator, a re-inspection of a double number of rolls (packs) selected from the same batch is carried out.
The result of the re-inspection applies to the entire batch.
5 Test methods
5.1 Sampling - according to GOST 20566.
5.2 The selected samples must be kept in unfolded form in climatic conditions in accordance with GOST 10681 for at least 12 hours.
5.3 Determination of linear dimensions and surface density - according to GOST 3811.
5.4 Determination of the number of threads per 10 cm - according to GOST 3812.
5.5 Determination of breaking load - according to GOST 3813.
5.6 Determination of whiteness and degree of whiteness stability - according to GOST 18054.
5.7 Determination of humidity and capillarity - according to GOST 3816, with the following addition: capillarity is determined in a draft-free room or in a closed cabinet.
5.8 Determination of the mass fraction of fatty substances and the mass fraction of viscose fiber - according to GOST 25617.
5.9 Determination of aqueous extract reaction
5.9.1 Test performance
From each point sample taken from a batch, three elementary samples weighing 5 g each are cut out, combined, filled with 150 cm of distilled water and boiled for 15 minutes. Then squeeze with a glass rod. The liquid is poured into a clean container and cooled to room temperature.
The reaction of the aqueous extract is determined using universal indicator paper or bromothymol blue. The reaction of the water extract should be neutral.
5.10 Determination of the mass fraction of chloride salts
5.10.1 To determine the mass fraction of chloride salts, use a solution of an aqueous extract obtained in accordance with 5.9.
5.10.2 Equipment and reagents
Analytical balances.
Desiccator according to GOST 25336.
Tripods.
Flasks with a capacity of 1000 cm3 according to GOST 25336.
Test tubes according to GOST 25336.
Pipettes according to GOST 29227.
Sodium chloride according to GOST 4233.
Distilled water according to GOST 6709.
Water hood 10 cm.
Silver nitrate according to GOST 1277, solution with a mass fraction of 2%.
Nitric acid according to GOST 4461
5.10.3 Preparation for testing
Solution A. To prepare a sample solution A of chlorine ion, 0.659 g of slightly calcined sodium chloride is dissolved in a 1000 ml volumetric flask and the volume of the solution is adjusted to the mark with distilled water. 25 cm of solution A is diluted to 1000 cm and a standard solution is obtained - solution B, containing 0.01 mg of chlorine ion per 1 cm or 0.001%.
5.10.4 Test performance
To 10 cm of aqueous extract add 0.5 cm of nitric acid solution and 0.5 cm of silver nitrate solution and mix. At the same time, 0.5 cm of solutions of nitric acid and silver nitrate are added to 10 cm of sample solution B and mixed. After 5 minutes, both solutions are compared. The resulting solution is considered to comply with the requirements of this standard if its opalescence does not exceed the opalescence of the reference solution.
5.11 Determination of the mass fraction of sulfuric acid salts
5.11.1 To determine the mass fraction of sulfuric acid salts, use a solution of an aqueous extract obtained in accordance with 3.9.
5.11.2 Equipment, reagents and solutions
Drying cabinet providing drying temperature (107±2) °C.
Weighing cups (bugs) in accordance with GOST 25336.
Volumetric flasks, capacity 1000 cm3, according to GOST 25336.
Pipettes according to GOST 29227.
Barium chloride according to GOST 4108, solution with a mass fraction of 5%.
Potassium sulfate according to GOST 4145.
Hydrochloric acid according to GOST 3118, solution with a mass fraction of 10%.
Water hood 10 cm.
Distilled water according to GOST 6709.
5.11.3 Preparation for testing
Solution A. To prepare a standard solution A of the sulfate ion, 1.814 g of potassium sulfate, dried at 100-105 °C to constant weight, is dissolved in a 1000 cm3 volumetric flask and the volume of the solution is adjusted to the mark with distilled water. 10 cm of solution A is diluted with distilled water to 1000 cm and a standard solution B is obtained, containing 0.01 mg of sulfate ion per 1 cm or 0.001%.
5.11.4 Test performance
To 10 cm of aqueous extract add 0.5 cm of hydrochloric acid solution and 1 cm of barium chloride solution and mix. At the same time, 0.5 cm of hydrochloric acid solution and 1 cm of barium chloride solution are added to 10 cm of sample solution B and mixed. After 20 minutes, both solutions are compared. The resulting solution is considered to comply with the requirements of this standard if its turbidity does not exceed the turbidity of the reference solution.
5.12 Determination of the mass fraction of calcium salts
5.12.1 To determine the mass fraction of calcium salts, use a solution of an aqueous extract obtained in accordance with 3.9.
5.12.2 Equipment, reagents and solutions
Measuring flasks with a capacity of 100, 1000 cm according to GOST 25336.
Analytical balances.
, solution with a mass fraction of 10%.
Distilled water according to GOST 6709.
5.12.3 Preparation for testing
Solution A. To prepare standard solution A of calcium ion, a 0.749 g sample of calcium carbonate, dried at 100-105 °C to constant weight, is mixed in a 100 cm3 volumetric flask with 10 cm3 of water. Then a solution of hydrochloric acid is gradually added to the flask until calcium carbonate is completely dissolved and after the disappearance of carbon dioxide bubbles, the volume of the solution is adjusted to the mark with distilled water. 10 cm of solution A is diluted with distilled water to 1000 cm and a standard solution B is obtained, containing 0.03 mg of calcium ion per 1 cm or 0.003%.
5.12.4 Testing
To 10 cm of aqueous extract add 1 cm of ammonium chloride solution, 1 cm of ammonia solution and 1 cm of ammonium oxalate solution and mix. At the same time, 1 cm of ammonium chloride solution, 1 cm of ammonia solution and 1 cm of ammonium oxalate are added to 10 cm of sample solution B and mixed. After 10 minutes, both solutions are compared. The test solution is considered to comply with the requirements of this standard if its turbidity does not exceed the turbidity of the reference solution
5.13 Determination of the content of oxidizable substances
5.13.1 Reagents
Potassium permanganate according to GOST 20490, solution with a mass fraction of 0.02 mol/dm.
Sulfuric acid according to GOST 4204, solution with a mass fraction of 10%.
5.13.2 Test performance
Add 3-5 drops of diluted sulfuric acid and 3 drops of potassium permanganate solution to 10 cm of water extract. The resulting slight coloration of the liquid should not disappear within 5 minutes.
5.14 Determination of sizing agents content
To 10 cm of aqueous extract add one drop of iodine solution according to GOST 4159 with a mass fraction of 0.5 mol/dm. Blue or light blue dyeing is not permitted.
5.15 Determination of coloring matter content
A glass with a diameter of no more than 5 cm is placed on white paper and 50 cm of water extract and 5 cm of acetic acid are poured into it according to GOST 61. Acidified and neutral extracts should not be colored. The color intensity is determined by the vertical layer of liquid.
5.16 Determination of ash content
5.16.1 Test performance
Two elementary samples of gauze, dried during determination of humidity, are burned until complete combustion in porcelain crucibles, previously brought to a constant mass.
5.16.2 Processing results
Ash content () as a percentage is calculated using the formula
where is the mass of ash, g;
- mass of an elementary sample of gauze after drying, g.
Calculations are carried out to the third decimal place and rounded to the second decimal place. The arithmetic mean of the results of two determinations is taken as the final result.
5.17 Determination of wettability
From each gauze sample tested for accuracy*, two elementary samples, each 5x5 cm in size, are cut out and, using tweezers, lowered in a straightened form onto the surface of distilled water at a temperature of 20 °C.
________________
* The text corresponds to the original. - Database manufacturer's note.
The width of the vessel should prevent the samples from touching its walls. Samples should be immersed in water no later than 10 s for cotton gauze and 6 s for mixed gauze.
6 Transportation and storage
Transportation and storage of gauze - in accordance with GOST 7000.
Electronic document text
prepared by Kodeks JSC and verified against:
official publication
M.: IPK Standards Publishing House, 2003
