Marley active mass. General specifications
Gauze medical description , quality, properties may be different, as there are several types this product. It should be noted that not all gauze can be used for medical purposes. Fabric for medical use referred to as gauze medical application such a product is clear from its name.
What qualities and distinctive features does medical gauze have, and for what purposes is it used?
Gauze medical description general
The material is intended for medical use. This is the main, but not the only area of its application.
This loose tissue with linen 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. Such material is characterized by excellent indicators of hygroscopicity. This is achieved due to the unique structure of the canvas.
Gauze medical description of the main characteristics:
- quickly absorbs moisture and retains it;
- does not leave a pile on the surface that is being processed;
- perfectly breathable, 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 labeling of the product - medical gauze, the description must include this information. The material that has undergone sterilization is widely used in surgery, for treating damaged skin areas and for other medical purposes.
Bleaching, sterilization is carried out by means of safe methods without the use of chlorine. Thus, the canvas does not provoke allergies, irritation on the treated areas of the body.
The product is on the market various types. The product has certain density indicators, measured in grams per square meter. Distinguish a product with a density of 28, 32, 36 g/sq.m. The higher this parameter, the more expensive. Each type of canvas is designed for certain needs. in hospitals, medical institutions most often used canvas with a density of 36 g / sq.m.
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, date of issue. The presence of holes, large gaps, dirty spots is not allowed.
Gauze medical application
Gauze medical application has a very diverse. This is an indispensable consumable product in the medical industry due to its lightness, strength, excellent ability to pass oxygen, which contributes to rapid healing. It is intended for dressings, stopping bleeding, drying wounds, eliminating purulent discharge, preventing damage from secondary pollution, and so on.
Gauze cloth is used for the manufacture of various products:
- cuts of certain sizes - 5, 10, 100, 200 meters;
- dressing;
- bandages, masks, etc.
Due to its unique qualities, gauze fabric is used not only in the medical industry. Also medical gauze has found application in many areas of industry, suitable for domestic needs.
In traumatology, gypsum-impregnated cloth is used to fix injuries and fractures. Products impregnated with various medicines used as a medicinal product. The most common product that is made from a linen with healing impregnation is bactericidal wipes, tampons to stop bleeding.
Gauze medical description and application in other industries:
- has excellent filtering properties, therefore it is used as a filter product;
- used as a rag, cleaning cloth, for cleaning dust, dirt;
- has found application for industrial purposes for cleaning surfaces from oils, fuel oil;
- degreasing the plane before painting;
- in the furniture industry plays the role of a lining;
- for gluing books and so on.
Non-sterile products are often used in household, sanitary areas. It is used for childcare. Often it is purchased as a wiping fiber, as it has excellent absorbency, is simply wrung out, and dries quickly.
Sterile tissue is most often used in medical direction. It's thin, fat-free, processed special method textile. Products have sufficient indicators of softness, hygroscopicity.
There are many varieties 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 the Decree of the State Standard of the Russian Federation of 18.01.95 N 6)
Edition of 01/18/1995 - Valid from 01/01/1996
RUSSIAN FEDERATION COMMITTEE ON STANDARDIZATION, METROLOGY AND CERTIFICATION
MEDICAL GAUGE GENERAL SPECIFICATIONS
medical gauze. General specification
GOST 9412-93
Introduction date 1996-01-01
Foreword
1. Developed by the Central Scientific - research institute cotton industry (TsNIHBI).
2. Introduced by the State Standard of Russia.
3. Adopted by the Interstate Council for Standardization, Metrology and Certification on March 15, 1994 (report of the Technical Secretariat N 1).
| State name | Name of the national standardization body |
| Republic of Azerbaijan | Azgosstandart |
| Republic of Belarus | Belstandard |
| The Republic of Kazakhstan | State Standard of the Republic of Kazakhstan |
| Republic of Kyrgyzstan | Kyrgyzstandart |
| The Republic of Moldova | Moldovastandard |
| Russian Federation | Gosstandart of Russia |
| Republic of Turkmenistan | Main State Inspectorate of Turkmenistan |
| Ukraine | State Standard of Ukraine |
4. Resolution of the Committee Russian Federation on standardization, metrology and certification dated 18.01.95 N 6, the interstate standard GOST 9412-93 was put into effect directly as the state standard of the Russian Federation from January 1, 1996.
5. Instead of GOST 9412-77.
1 AREA OF USE
This standard applies to cotton and blended, viscose-filled, gray 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. Specifications.
GOST 1277-75 Nitrate silver.
GOST 3118-77 Hydrochloric acid. Specifications.
GOST 3760-79 Water ammonia. Specifications.
GOST 3773-72 Ammonium chloride. Specifications.
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 handicrafts. Methods for determining the density of threads and bunches of pile.
GOST 3813-72 Textile materials. Fabrics and handicrafts. Methods for determining discontinuous characteristics in tension.
GOST 3816-81 Textile fabrics. Methods for determining hygroscopic and water-repellent properties.
GOST 4108-72 Barium chloride. Specifications.
GOST 4145-74 Potassium sulfate. Specifications.
GOST 4159-79 Iodine. Specifications.
GOST 4204-77 Sulfuric acid. Specifications.
GOST 4233-77 Sodium chloride.
GOST 4461-77 Nitric acid. Specifications.
GOST 4530-76 Calcium carbonate. Specifications.
GOST 5530-81 Packaging and technical fabrics. Specifications.
GOST 5712-78 Ammonium oxalate 1-aqueous. Specifications.
GOST 29227-91 Laboratory glassware. Pipettes graduated. Part 1. General requirements.
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, basic parameters and sizes.
GOST 25617-83 Linen, semi-linen, cotton and mixed fabrics and products. Methods of chemical tests.
3. REQUIREMENTS
3.1. Gauze must be produced in accordance with the requirements of this standard, technical descriptions and typical technological regimes approved in in due course.
Harsh gauze should ensure the release of finished gauze in accordance with the requirements of this standard.
3.2. Characteristics
3.2.1. Gauze should be produced from cotton yarn in accordance with the normative documentation for standardization and cotton-viscose yarn in accordance with the 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.
Allowed length of bleached gauze in a piece is not less than 20 m in an amount of not more than 10% of the lot.
The length of gauze in a roll should be:
for bleached - from 800 to 1300 m;
for severe - from 5000 to 8000 m.
It is 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 the manufacture of bandages, unstitched pieces of gauze, as well as stitching of gauze with various types of edges, are not allowed. The gauze stitching is done on an overlock machine.
In places of stitching two pieces of gauze, a width reduction of 10 cm on each side is allowed. The seam is considered a conditional cut. The distance from the end of a 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 with a size of 50x200 mm should be, N (kgf), not less than:
for bleached:
Based - 78.0 (8.0);
for harsh:
On the basis - 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 along the density surface must be at least minus 5%.
Permissible deviations in the number of threads per 10 cm should be,%:
for harsh:
Based on - +/-2;
For duck - +/-3;
for bleached, not less than:
On the basis - -2;
For duck - -3.
Plus allowable deviations on the density surface and the number of threads per 10 cm for bleached gauze are not limited.
3.2.7. According to physical and chemical parameters, bleached gauze must meet the requirements specified in Table 1.
Table 1
PHYSICAL - CHEMICAL INDICATORS OF BLEACHED GAUGE
| Name of indicator | Norm |
| Water extract reaction | Neutral |
| Mass fraction of chloride salts, %, no more | 0,02 |
| Mass fraction of sulfate salts,%, no more | 0,02 |
| Mass fraction of calcium salts, %, no more | 0,06 |
| Time for determining the content of oxidizable substances, min, not less than | 5 |
| Content of sizing agents | Not allowed |
| The content of coloring substances | Colorless extracts |
| Mass fraction of fatty substances, %, not more than Wetability, s, not 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 stability of whiteness, %, no more | 10 |
| Note - The indicator of the degree of stability of whiteness 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 on the background of gauze larger than 5 cm, oily and dirty spots, a tightened edge of more than 1 m along the length of the fabric;
defects of the 2nd group - short cuts of more than three threads, weft shortfall of more than three threads, wefts of more than five threads, close in three or more threads, holes on the background of gauze no larger than 5 cm, fringe along 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 gauze in reflected or natural light on drying drums and tenter equipment.
3.2.8.2. The defects of the 1st group must be cut out at the manufacturer.
The vices 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. No more than six conditional cuts are allowed for a conditional length of a piece of 100 m.
If the actual length of a piece or roll deviates from the conditional length, the number of conditional cuts (Pu) per cub length of the piece is calculated by the formula:
| Pu = | Pf x 100 | (1) | |
| lf | |||
where Pf - the actual number of conditional cuts in a piece or roll;
lf - actual length of a piece or roll, m;
100 - conditional length of a piece, m.
The length of the conditional cutouts of gauze 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. In severe gauze, marks or stains of dye that are not washed off during bleaching are not allowed.
3.2.9. IN technical description for a specific dressing (article) of finished and severe gauze should be installed the following indicators: raw material composition; linear density of yarn; number of threads per 10 cm in warp and weft; surface density; brand width; breaking load; weave.
Technical descriptions for gauze used for military orders must be agreed with the customer.
3.2.10. By agreement between the manufacturer and the consumer, it is allowed to establish additional requirements that are not provided for by this standard.
3.2.11. The gauze is folded into pieces or rolled into rolls in full width evenly without buckling and overhanging of the edges of the gauze.
Pieces of bleached gauze are folded into two folds. Packs are completed with two or three pieces of gauze and tied with twine according to 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. At both ends of a piece or roll, a personal brand of the operator of the tenter equipment is applied. 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, pack or bale of indelible ink must be marked or labeled with the following data in clear printed type:
gauze name and article number;
gauze total length and article number;
total length of conditional cuts;
lot numbers;
release dates;
designations of this standard.
3.4. Package
3.4.1. Packs of bleached gauze are wrapped in paper and tied with twine, then they are completed in bales weighing 80 kg and packed in packing fabric according to GOST 5530 or non-woven fabric according to regulatory and technical documentation.
3.4.2. Bleached gauze rolls are wrapped in paper and wrapping cloth.
By agreement between the manufacturer and the consumer, it is allowed to pack bleached gauze rolls in paper and polyethylene 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, issued with one quality document.
Each batch of gauze is accompanied by a quality document indicating the following data:
the name of the enterprise - the manufacturer and his trade mark;
gauze name and article number;
gauze quality assessment results;
designation of this standard;
lot numbers;
the number of rolls or bales in a lot.
4.2. All rolls or bundles of a lot shall be checked for conformity with the requirements of this standard for correct packaging and marking.
4.3. To check the quality of gauze in terms of 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 the 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 doubled number of rolls (packs) selected from the same batch is carried out on it.
The result of the re-check 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 of 10 cm - according to GOST 3812.
5.5. Determination of breaking load - according to GOST 3813.
5.6. Determination of whiteness and the degree of stability of whiteness - according to GOST 18054.
5.7. Determination of humidity and capillarity - according to GOST 3816, with the following addition: capillarity is determined in a room that excludes drafts, 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 water extract reaction
5.9.1. Conducting a test
From each point sample taken from the batch, three elementary samples weighing 5 g each are cut out, combined, 150 cubic meters are poured. cm of distilled water and boil for 15 min. 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 with 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, a solution of an aqueous extract obtained in accordance with 5.9 is used.
5.10.2. Equipment and reagents
Desiccator according to GOST 25336.
Flasks with a capacity of 1000 cubic meters. see according to GOST 25336.
Pipettes according to GOST 29227.
Sodium chloride according to GOST 4233.
Extract water 10 cu. 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 standard 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 dilute the solution with distilled water to the mark. 25 cu. cm solution A is diluted to 1000 cc. cm and get an exemplary solution - solution B, containing 0.01 mg of chlorine - ion in 1 cu. cm or 0.001%.
5.10.4. Conducting a test
To 10 cu. cm of water extract pour 0.5 cu. cm solution of nitric acid, 0.5 cu. see a solution of silver nitrate and mix. Simultaneously to 10 cu. cm exemplary solution B add 0.5 cu. see 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 that of the reference solution.
5.11. Determination of the mass fraction of sulfate salts
5.11.1. To determine the mass fraction of sulfate salts, a solution of an aqueous extract obtained in accordance with 5.9 is used.
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. see 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.
Extract water 10 cu. cm.
5.11.3. Preparing for the test
Solution A. To prepare a standard solution A of sulfate - ion in a volumetric flask with a capacity of 1000 cubic meters. cm dissolve 1.814 g of potassium sulfate, dried at 100-105 degrees. C to constant weight and bring the volume of the solution with distilled water to the mark. 10 cu. cm solution A is shaken with distilled water to 1000 cu. cm and get an exemplary solution B containing 0.01 mg sulfate - ion in 1 cu. cm or 0.001%.
5.11.4. Conducting a test
To 10 cu. cm of water extract pour 0.5 cu. see solution of hydrochloric acid, 1 cu. see a solution of barium chloride and mix. Simultaneously to 10 cu. cm exemplary solution B add 0.5 cu. cm hydrochloric acid solution, 1 cu. see a solution of barium chloride and mix. 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 exemplary standard.
5.12. Determination of the mass fraction of calcium salts
5.12.1. To determine the mass fraction of calcium salts, an aqueous extract solution obtained in accordance with 5.9 is used.
5.12.2. Equipment, reagents and solutions
Volumetric flasks with a capacity of 100, 1000 cubic meters. see according to GOST 25336.
Scales are analytical.
Drying cabinet providing drying temperature (107 +/- 2) deg. WITH.
Desiccator according to GOST 25336.
Cups for weighing (bottle bags) according to GOST 25336.
Pipettes according to GOST 29227.
Test tubes according to GOST 25336.
Ammonia water in accordance with 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%.
Extract water 10 cu. cm.
5.12.3. Preparing for the test
Solution A. To prepare an exemplary solution A of calcium - an ion, a sample of calcium carbonate 0.749 g, dried at 100-105 degrees. C to constant weight, mixed in a volumetric flask with a capacity of 100 cubic meters. cm from 10 cu. see water. Then a solution of hydrochloric acid is gradually added to the flask until the calcium carbonate is completely dissolved and after the disappearance of bubbles carbon dioxide Dilute the volume of the solution with distilled water to the mark. 10 cu. cm solution A is diluted with distilled water to 1000 cubic meters. cm and get an exemplary solution B containing 0.03 mg of calcium - an ion in 1 cu. cm or 0.003%.
5.12.4. Testing
To 10 cu. cm of water extract pour 1 cu. cm solution of ammonium chloride, 1 cu. cm ammonia solution and 1 cu. cm solution of ammonium oxalate and mix. Simultaneously to 10 cu. cm exemplary solution B add 1 cu. cm solution of ammonium chloride, 1 cu. cm 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 / cu. dm.
Sulfuric acid according to GOST 4204, solution with a mass fraction of 10%.
5.13.2. Conducting a test
To 10 cu. cm water extract pour 3-5 drops of dilute sulfuric acid and 3 drops of potassium permanganate solution. Received weak staining fluid should not disappear within 5 minutes.
5.14. Determination of the content of sizing agents
To 10 cu. cm water extract add one drop of iodine solution according to GOST 4159 with a mass fraction of 0.5 mol / cu. dm. Blue or light blue coloring is not allowed.
5.15. Determination of the content of coloring substances
A glass with a diameter of not more than 5 cm is placed on white paper and 50 cubic meters are poured into it. cm 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 the liquid.
5.16. Determination of ash content
5.16.1. Conducting a test
Two elementary samples of gauze dried in determining the moisture content are burned until complete combustion in porcelain crucibles, previously brought to constant weight.
5.16.2. Results processing
Ash content (Z) as a percentage is calculated by 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 the two determinations is taken as the final result.
5.17. Determination of wettability
From each tested accuracy of the gauze sample, two elementary samples of 5x5 cm each are cut out and lowered with tweezers in a straightened form onto the surface of distilled water with a temperature of 20 degrees C.
The width of the vessel should exclude the possibility of samples touching its walls. Samples must be immersed in water within 10 s for cotton gauze and 6 s for mixed gauze.
6. TRANSPORT AND STORAGE
Transportation and storage of gauze - according to GOST 7000.
On the shelves of pharmacies, you can find various products, including the simplest ones, such as plasters, bandages and ordinary gauze. But few people know that this product must meet certain requirements in order to fully perform its functions. In all medical institutions, they purchase only those products that comply with GOST. Consider 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 cut, which in most cases is found in pharmacies in individual packaging. It is often used for dressings, fixing cotton swabs, as well as other medical products.
Medical gauze in rolls is 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 produced specifically for a variety of medical purposes as the basis for dressings, which 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 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 plain weave. It is made up of sparsely woven threads (having a simple weave) and is usually dyed in 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 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 contaminants. In production shops, such material is used to eliminate oil and subsequent degreasing of 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.
GOST 9412-93 gauze can also be sterile, in which case it is bleached without the use of chlorine and its various components. Due to this, the resulting canvas is not capable of provoking allergic reactions during contact with damaged skin. Just sterile gauze is used for the preparation of most medical products.
Medical gauze - technical specifications
Thus, medical gauze meets a number of requirements. It is characterized by excellent capillary and hemostatic properties. Due to the 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 10.0 s, and the breaking load must be equal to H-78. On sterile gauze, no visual defects, extensive holes in the canvas should be visible. In addition, it should not have spots, and there should be no shortage of more than three threads in a row in the weave.
Medical gauze - GOST 9412-93 - has a certain width - ninety centimeters. Usually it is sold in rolls of a thousand meters, or in cuts of two to ten meters.
Additional Information
Sterile gauze is used for the preparation of 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). Such a structure is usually used during surgical interventions in order to eliminate excess moisture in the right areas. Such a group of products must especially correspond to the quality, because their components are constantly in contact with liquids. human body and can carry infection.
Also, gauze can be purchased in the form of a cut, such material is already used in the hospital to form dressings and tampons, designed to be in direct contact with the wound. Quite often, gauze cuts are used for dressing wounds of a large area and burn lesions. Due to the presence of pressed edges on the cut, the gauze is in contact with the body especially softly, which helps to reduce the intensity. pain.
Thus, bleached cotton gauze is actually a universal dressing and surgical material, which is actively used in different areas medicine, represented by surgery, dentistry, obstetrics, traumatology, etc. It is worth noting that non-sterile gauze should be used for household needs, it is cheaper and more practical.
Ekaterina, www.site
P.S. The text uses some forms characteristic of oral speech.
One of the materials well suited for "wiping" is gauze. But gauze, like any other fabric, has its own characteristics. Next I will tell what is gauze, its types and characteristics.
gauze harsh
Harsh gauze or sometimes it is 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 in order to wipe off dirt, dust and various liquids.
From severe gauze they make technical bleached gauze And medical gauze. For the latter, according to GOST, severe gauze with a density of at least 39 g / m2 should be used. The width of a roll of harsh 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
It is sometimes believed that bleached gauze is medical, but in fact it is not. And technical bleached gauze differs from medical gauze primarily in density, it is different for all manufacturers, and then I will give standard densities that can be found on the market.
Density of bleached technical gauze:
- 25 g / m2 - the minimum density that occurs, sometimes given out as gauze with a density of 26 g / m2 and higher. Used as the cheapest option.
- 26 g/m2 - more common, not much different from 25 g/m2, it is this gauze that 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 given out for it.
- 32 g / m2 is also a fairly popular type of gauze, in addition to “rubbing” it is used as filters for liquids, and is also often passed off as medical gauze. 🙂 Such gauze is already much denser.
- 34 g / m2 - sometimes found.
Density of course also affects the price, respectively, the lower the density, the lower the price and the higher, the more expensive.
On the left 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 with a width of 90 cm, in any case, this is the most popular width and I have not seen another one. The width is generally standard and there’s even nothing to say here, the next point is much more important.
An important parameter is how many meters are wound in a roll. It is important because it also affects the price, but unlike density, there is another dependence, the fewer running meters in a roll, the more expensive the gauze.
Standard winding in a roll is 1000 running meters. and 200 linear meters Also, in addition to rolls, they sell gauze cuts of 1, 3, 5, 10 linear meters. m., they are usually folded and packed in a transparent bag.
You can also say that gauze rolls come with and without a sleeve, this usually does not affect the price.
Bleached medical gauze technical characteristics
This gauze is taken out separate item, since not all bleached gauze can be considered medical, or rather, bandages and medical wipes are made from any bleached gauze (of course, they differ 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.
Medical gauze density according to GOST, it should be at least 36 g / m2, but in fact, sometimes gauze with a density of 32 g / m2 is given out for it (fortunately, there are fewer unscrupulous sellers on the market). A roll width of 90 cm is also popular and much less common is medical gauze 84 cm wide. Winding in rolls, the same in 1000 and 200 meters. As well as gauze cuts of 1, 3, 5, 10 (in fact, manufacturers can make cuts of any size on 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 autoclaving at elevated temperature and pressure.
The range of application of medical gauze is somewhat different, it is rarely used for wiping purposes, since it is more expensive and is mainly used for its intended purpose (for the manufacture of dressings). Gauze bandages and tampons are widely used in medicine and various laboratories. Also medical gauze is good for filtering various liquids, including in manufacturing.
Gauze with a density of 52 g/m2
Another type of gauze is used much less frequently compared to other types, as it costs more. And the scope of application is mainly as filters.
In conclusion…
I would also like to note that gauze trimmings from production (marriage, both harsh and bleached gauze) are pressed and packed into briquettes of 10 kg, thus obtaining. Below are photos of medical gauze, bleached technical and harsh with comments.
Photo of bleached gauze
On the left 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
Introduction date 1996-01-01
Foreword
1 DEVELOPED by the Central Research Institute of the Cotton Industry (TsNIHBI)
2 INTRODUCED by the State Standard of Russia
3 ADOPTED by the Interstate Council for Standardization, Metrology and Certification on March 15, 1994 (Report of the Technical Secretariat No. 1)
Voted to accept:
State name | Name of national authority |
Republic of Azerbaijan | Azgosstandart |
Republic of Belarus | Belstandard |
The Republic of Kazakhstan | State Standard of the Republic of Kazakhstan |
Republic of Kyrgyzstan | Kyrgyzstandart |
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 of the Russian Federation for Standardization, Metrology and Certification dated January 18, 1995 N 6, the interstate standard GOST 9412-93 was put into effect directly as the state standard of the Russian Federation from January 1, 1996.
5 INSTEAD OF GOST 9412-77
6 REVISION. August 2003
1 area of use
1 area of use
This standard applies to cotton and blended, viscose-filled, gray 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 Nitrate silver. Specifications
GOST 3118-77 Hydrochloric acid. Specifications
GOST 3760-79 Water ammonia. 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 handicrafts. Methods for determining the density of threads and bunches of pile
GOST 3813-72 (ISO 5081-77, ISO 5082-82) Textile materials. Fabrics and handicrafts. Methods for determining rupture characteristics in tension
GOST 3816-81 (ISO 811-81) Textile fabrics. Methods for determining hygroscopic and water-repellent properties
GOST 4108-72 Barium chloride 2-aqueous. 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* Packaging and technical fabrics. Specifications
________________
* On the territory of the Russian Federation, GOST 5530-2004 applies. Here and further. - Database manufacturer's note.
GOST 5712-78 Ammonium oxalate 1-aqueous. Specifications
GOST 6709-72 Distilled water. Specifications
GOST 7000-80 Textile materials. Packaging, marking, 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. Method for determining whiteness
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, basic parameters and dimensions
GOST 25617-83 Linen, semi-linen, cotton and mixed fabrics and products. Chemical test methods
GOST 29227-91 (ISO 835-1-81) Laboratory glassware. Pipettes graduated. Part 1. General requirements
3 Requirements
3.1 Gauze should be produced in accordance with the requirements of this standard, technical descriptions and typical technological regimes approved in the prescribed manner.
Harsh gauze should ensure the release of finished gauze in accordance with the requirements of this standard.
3.2 Characteristics
3.2.1 Gauze should be produced from cotton yarn in accordance with the normative documentation for standardization and cotton-viscose yarn in accordance with the 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.
Allowed length of bleached gauze in a piece is not less than 20 m in an amount of not more than 10% of the lot.
The length of gauze in a roll should be:
for bleached - from 800 to 1300 m;
for severe - from 5000 to 8000 m.
It is 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 the manufacture of bandages, unstitched pieces of gauze, as well as stitching of gauze with various types of edges, are not allowed. The gauze stitching is done on an overlock machine.
In places of stitching two pieces of gauze, a width reduction of 10 cm on each side is allowed. The seam is considered a conditional cut. The distance from the end of a 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 Breaking load of a strip of gauze with a size of 50x200 mm should be, N (kgf), not less than:
for bleached:
- on the basis - 78.0 (8.0);
- duck - 34.0 (3.5);
for harsh:
On the basis - 83.0 (8.5);
- duck - 44.0 (4.5).
3.2.5 The surface density of gauze should 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 harsh:
- on the basis - ±2;
- duck - ±3;
for bleached, not less than:
- on the basis - -2;
- for duck - -3.
Plus allowable deviations in surface density and the 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 - Physical and chemical parameters of bleached gauze
Name of indicator | |
Water extract reaction | Neutral |
Mass fraction of chloride salts, %, no more | |
Mass fraction of sulfate salts,%, no more | |
Mass fraction of calcium salts, %, no more | |
Time for determining the content of oxidizable substances, min, not less than | |
Not allowed |
|
Colorless extracts |
|
Mass fraction of fatty substances, %, no more | |
Wettability, s, no more than: | |
for cotton gauze | |
for mixed gauze | |
Capillarity, cm/h, not less | |
Humidity, % | |
Ash content, %, no more | |
Whiteness, %, not less | |
Degree of stability of whiteness, %, no more | |
Note - The indicator of the degree of stability of whiteness 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 appearance defects are not allowed in gauze:
defects of the 1st group - holes on the background of gauze larger than 5 cm, oily and dirty spots, a tightened edge of more than 1 m along the length of the fabric;
defects of the 2nd group - short cuts of more than three threads, weft shortfall of more than three threads, wefts of more than five threads, close in three or more threads, holes on the background of gauze no larger 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 gauze in reflected or natural light on drying drums and tenter equipment.
3.2.8.2 Defects of the 1st group must be cut out at the manufacturer.
The vices 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. No more than six conditional cuts are allowed for a conditional length of a piece of 100 m.
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 by the formula
where - the actual number of conditional cuts in a piece or roll;
- actual length of a piece or roll, m;
- conditional length of the piece, m.
The length of conditional gauze cutouts is not included in the total 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 are not washed off during bleaching are not allowed in the harsh gauze.
3.2.9 In the technical description for a specific dressing (article) of finished and heavy gauze, the following indicators should 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 descriptions for gauze used for military orders must be agreed with the customer.
3.2.10 By agreement between the manufacturer and the consumer, it is allowed to establish additional requirements that are not provided for by this standard.
3.2.11 The gauze is folded into pieces or rolled into rolls in full width evenly without distortions and overhanging of the edges of the gauze.
Pieces of bleached gauze are folded into two folds. Packs are completed with two or three pieces of gauze and tied with twine according to GOST 17308 or with a braid along the 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 At both ends of a piece or roll, a personal stamp of the operator of tenter equipment is applied in a 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, pack or bale of indelible ink must be marked or labeled with the following data in clear printed type:
the total length of gauze in a pack, bale or roll;
total length of conditional cuts;
lot numbers;
release dates;
designations of this standard.
3.4 Packaging
3.4.1 Packages of bleached gauze are wrapped with paper and tied with twine, then they are assembled into bales weighing 80 kg and packed in packaging fabric according to GOST 5530 or non-woven fabric according to ND.
3.4.2 Rolls of bleached gauze are wrapped with paper and wrapping cloth.
By agreement between the manufacturer and the consumer, it is allowed to pack bleached gauze rolls in paper and polyethylene film.
4 Acceptance rules
4.1 Gauze is accepted 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, issued with one quality document.
Each batch of gauze is accompanied by a quality document indicating the following data:
the name of the manufacturer and its trademark;
gauze name and article number;
gauze quality assessment results;
designations of this standard;
lot numbers;
the number of rolls or bales in a lot.
4.2 All rolls or bundles of a lot shall be checked for correct packaging and labeling with the requirements of this standard.
4.3 To check the quality of gauze in terms of 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 checks 3% of the 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 doubled number of rolls (packs) taken from the same batch is carried out on it.
The result of the re-check applies to the entire batch.
5 Test methods
5.1 Sampling - according to GOST 20566.
5.2 The selected samples must be kept in expanded 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 stability of whiteness - 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 aqueous extract reaction
5.9.1 Conducting the test
From each point sample taken from a batch, three elementary samples of 5 g each are cut out, combined, poured into 150 cm3 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 with universal indicator paper or bromthymol 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, a solution of an aqueous extract obtained in accordance with 5.9 is used.
5.10.2 Apparatus and reagents
Scales are analytical.
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 extractor 10 cm.
Silver nitrate according to GOST 1277, solution with a mass fraction of 2%.
Nitric acid according to GOST 4461
5.10.3 Test preparation
Solution A. To prepare a standard solution A of chlorine ion in a volumetric flask with a capacity of 1000 cm 3, dissolve 0.659 g of slightly calcined sodium chloride and bring the volume of the solution to the mark with distilled water. 25 ml of solution A is diluted to 1000 ml and a reference solution is obtained - solution B, containing 0.01 mg of chlorine ion per 1 ml or 0.001%.
5.10.4 Testing
To 10 cm3 of an aqueous extract, add 0.5 cm3 of a solution of nitric acid, 0.5 cm2 of a solution of silver nitrate and mix. At the same time, 0.5 cm3 of solutions of nitric acid and silver nitrate are added to 10 cm3 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 that of the reference solution.
5.11 Determination of the mass fraction of sulfate salts
5.11.1 To determine the mass fraction of sulfate salts, an aqueous extract solution obtained in accordance with 3.9 is used.
5.11.2 Apparatus, reagents and solutions
Drying cabinet providing drying temperature (107±2) °C.
Cups for weighing (bottle bags) in accordance with GOST 25336.
Volumetric flasks, with a capacity of 1000 cm3 in accordance with 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 extractor 10 cm.
Distilled water according to GOST 6709.
5.11.3 Test preparation
Solution A. To prepare a standard solution A of sulfate ion in a volumetric flask with a capacity of 1000 cm3, dissolve 1.814 g of potassium sulfate dried at 100-105 ° C to constant weight and bring the volume of the solution with distilled water to the mark. 10 ml of solution A is diluted with distilled water to 1000 ml and an exemplary solution B is obtained containing 0.01 mg of sulfate ion per 1 ml or 0.001%.
5.11.4 Testing
To 10 cm3 of aqueous extract, add 0.5 cm3 of hydrochloric acid solution, 1 cm3 of barium chloride solution and mix. At the same time, 0.5 ml of hydrochloric acid solution and 1 ml of barium chloride solution are added to 10 ml 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, an aqueous extract solution obtained in accordance with 3.9 is used.
5.12.2 Apparatus, reagents and solutions
Volumetric flasks with a capacity of 100, 1000 cm3 in accordance with GOST 25336.
Scales are analytical.
, a solution with a mass fraction of 10%.
Distilled water according to GOST 6709.
5.12.3 Test preparation
Solution A. To prepare a reference solution A of calcium ion, a weighed portion of calcium carbonate 0.749 g, dried at 100-105 ° C to constant weight, is mixed in a volumetric flask with a capacity of 100 cm3 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 ml of solution A is diluted with distilled water to 1000 ml and an exemplary solution B is obtained containing 0.03 mg of calcium ion per 1 ml or 0.003%.
5.12.4 Testing
To 10 cm3 of aqueous extract, add 1 cm3 of ammonium chloride solution, 1 cm3 of ammonia solution and 1 cm3 of ammonium oxalate solution and mix. At the same time, 1 ml of ammonium chloride solution, 1 ml of ammonia solution and 1 ml of ammonium oxalate are added to 10 ml 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 oxidisable 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 Conducting the test
3-5 drops of dilute sulfuric acid and 3 drops of potassium permanganate solution are added to 10 cm of water extract. The resulting faint coloration of the liquid should not disappear within 5 minutes.
5.14 Determination of sizing agents
One drop of iodine solution according to GOST 4159 with a mass fraction of 0.5 mol / dm is added to 10 cm of water extract. Blue or light blue coloring is not allowed.
5.15 Determination of the content of coloring substances
A glass with a diameter of not 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 painted. The color intensity is determined by the vertical layer of the liquid.
5.16 Determination of ash content
5.16.1 Testing
Two elementary samples of gauze dried in determining the moisture content are burned until complete combustion in porcelain crucibles, previously brought to constant weight.
5.16.2 Handling results
Ash content () as a percentage is calculated by 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 the two determinations is taken as the final result.
5.17 Determination of wettability
From each tested accuracy* of gauze samples, two elementary samples of 5x5 cm each are cut out and lowered with tweezers 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 exclude the possibility of samples touching its walls. Samples must be immersed in water within 10 s for cotton gauze and 6 s for mixed gauze.
6 Transport and storage
Transportation and storage of gauze - according to GOST 7000.
Electronic text of the document
prepared by Kodeks JSC and verified against:
official publication
M.: IPK Standards Publishing House, 2003
