GB/T 12704.1-2009 English PDF

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 12704.1-2009	70	Add to Cart	Auto, < 3 mins	Textiles -- Test method for water-vapour transmission of fabrics -- Part 1: Desiccant method	Valid
GB/T 12704-1991	230	Add to Cart	Auto, < 3 mins	Fabrics--Determination of vapour transmission rate--Dish method	Obsolete

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Basic data

Standard ID: GB/T 12704.1-2009 (GB/T12704.1-2009)
Description (Translated English): Textiles -- Test method for water-vapour transmission of fabrics -- Part 1: Desiccant method
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: W55
Classification of International Standard: 59.080.30
Word Count Estimation: 10,155
Date of Issue: 2009-03-19
Date of Implementation: 2010-01-01
Older Standard (superseded by this standard): GB/T 12704-1991
Quoted Standard: GB/T 3820; GB/T 6529; GB/T 8170
Regulation (derived from): National Standard Approval Announcement 2009 No.3 (Total No.143)
Issuing agency(ies): General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China
Summary: This standard specifies the use of moisture vapor permeability of fabric measuring method approach. This section applies to all types of fabric thickness of 10mm or less, does not apply to water vapor transmission rate greater than 29000g/(m2. 24h) fabrics.

GB/T 12704.1-2009: Textiles -- Test method for water-vapour transmission of fabrics -- Part 1: Desiccant method

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Textiles -- Test method for water-vapour transmission of fabrics -- Part 1: Desiccant method ICS 59:080:30 W04 National Standards of People's Republic of China GB/T 12704:1-2009 Replacing GB/T 12704-1991 Test method for moisture permeability of textile fabrics Part 1: Hygroscopic method Published on:2009-03-19 2010-01-01 Implementation General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China Released by the Standardization Administration of China

foreword

GB/T 12704 "Test method for moisture permeability of textile fabrics" includes the following two parts: --- Part 1: Moisture absorption method; --- Part 2: Evaporation method: This part is Part 1 of GB/T 12704: This Part replaces GB/T 12704-1991 "Determination of moisture permeability of fabrics, moisture permeable cup method": This part and GB/T 12704- The main differences in:1991 are: --- Delete the relevant terms of Method B; --- In the scope, "applicable to all kinds of fabrics, including moisture-permeable coated fabrics" is changed to "applicable to all kinds of fabrics with a thickness of less than 10mm: It is not suitable for fabrics with a moisture permeability greater than 29000g/(m2·24h)”; --- Deleted the definition of "moisture permeability", and added the terms and definitions of "moisture permeability", "moisture permeability" and "moisture permeability coefficient"; --- Put forward specific requirements for the test box, and standardize the quality range of the moisture-permeable cup and the moisture-permeable cup assembly; --- Increase the humidity control of the sample; --- Added blank test; --- Added b), c) two groups of test conditions; --- It is stipulated that the total increase of desiccant moisture absorption shall not exceed 10%; --- Change the equilibration time from the original standard 0:5h to 1h, and stipulate that the initial equilibration time and weighing can be adjusted according to the moisture permeability of the sample: The interval time is adjusted accordingly; --- Change "the weighing time of each combination does not exceed 30s" to "not exceed 15s"; ---Added the calculation formulas of moisture permeability and moisture permeability coefficient; --- Added Appendix A "Relationship between saturated water vapor pressure and temperature": Appendix A of this section is a normative appendix: This part is proposed by China Textile Industry Association: This part is under the jurisdiction of the Basic Standards Branch of the National Textile Standardization Technical Committee (SAC/TC209/SC1): This section is drafted by: China Textile Standard (Beijing) Inspection and Certification Center Co:, Ltd:, National Textile Products Quality Supervision and Inspection Center: The main drafters of this section: Zhang Hui: The previous versions of the standards replaced by this part are as follows: --- GB/T 12704-1991: GB/T 12704:1-2009 Test method for moisture permeability of textile fabrics Part 1: Hygroscopic method

1 Scope

This part of GB/T 12704 specifies the method for measuring the moisture permeability of fabrics by the moisture absorption method: This section applies to all kinds of fabrics with a thickness of less than 10mm, but not to fabrics with a moisture permeability greater than 29000g/(m2·24h):

2 Normative references

The terms in the following documents are the terms of this part through reference to this part of GB/T 12704: All dated citations document, all subsequent amendments (excluding errata content) or revisions do not apply to this part, however, it is encouraged to reach agreement in accordance with this part The parties to the agreement study the availability of the latest versions of these documents: For undated references, the latest edition applies to this part: GB/T 3820 Determination of Thickness of Textiles and Textile Products GB/T 6529 Standard atmosphere for humidity control and testing of textiles (GB/T 6529-2008, ISO 139:2005, MOD) GB/T 8170 Numerical Rounding Rules and Representation and Judgment of Limit Values

3 Terms and Definitions

The following terms and definitions apply to this part of GB/T 12704: 3:1 W T Under the condition of maintaining the specified temperature and humidity on both sides of the sample, the mass of water vapor passing through the unit area of the sample vertically within the specified time, in grams per square meter The unit is cubic meter hour [g/(m2·h)] or gram per square meter 24 hours [g/(m2·24h)]: 3:2 WP Under the condition of maintaining the specified temperature and humidity on both sides of the sample, under the unit water vapor pressure difference, the vertical passage of the sample per unit area within the specified time The mass of water vapor, measured in grams per square meter Pascal hour [g/(m2·Pa·h)]: 3:3 Under the condition of maintaining the specified temperature and humidity on both sides of the sample, under the unit water vapor pressure difference, the unit thickness and unit surface are vertically penetrated in unit time: The mass of water vapor of the accumulated sample, in grams centimeters per square centimeter second Pascal [g·cm/(cm2·s·Pa)] as the unit:

4 Principles

Place the moisture permeable cup filled with desiccant and sealed with the fabric sample in a sealed environment with specified temperature and humidity, and permeate it within a certain period of time: Changes in the mass of the wet cup were used to calculate the moisture permeability, moisture permeability and moisture permeability coefficient of the samples: GB/T 12704:1-2009

5 Equipment and materials

5:1 Test chamber 5:1:1 The test chamber shall be equipped with temperature and humidity sensors and measuring devices, the temperature control accuracy is ±2°C, and the relative humidity control accuracy is ±4%, and each time the door of the test chamber is closed, the specified temperature and humidity shall be reached within 3 minutes: 5:1:2 It should have a continuous and stable circulating air velocity with a size of 0:3m/s to 0:5m/s: 5:1:3 It should be ensured that the temperature and humidity are uniform everywhere in the working space of the test chamber, and condensation should not occur on the surface of the sample during the test: 5:2 Permeable cup and accessories 5:2:1 The dimensions of the permeable cup and accessories are shown in Figure 1: 5:2:2 The moisture permeable cup, pressure ring, cup cover, bolts and nuts shall be made of light materials that are airtight, moisture impermeable and corrosion-resistant: The moisture permeable cup and cup cover shall be corresponding number: 5:2:3 The mass of the test combination consisting of sample, moisture absorbent, moisture permeable cup and accessories should be less than 210g: 5:2:4 The gasket is made of rubber or polyurethane plastic: 5:2:5 The width of vinyl adhesive tape should be greater than 10mm: GB/T 12704:1-2009 5:2:6 The moisture-permeable cups sealed by other methods can also be used as long as they meet the two dimensions of inner diameter 60mm and cup depth 22mm: 5:3 Other appliances 5:3:1 Electronic balance with an accuracy of 0:001g: 5:3:2 Keep the oven at a temperature of 160 °C: 5:3:3 Desiccant, using anhydrous calcium chloride (chemically pure), with a particle size of 0:63mm to 2:5mm, should be dried in an oven at 160°C before use 3h: 5:3:4 Standard sieves, one with an aperture of 0:63mm and one with an aperture of 2:5mm: 5:3:5 Dryer, standard wafer punch: 5:3:6 Fabric thickness meter, measure the thickness of the fabric according to GB/T 3820 with an accuracy of 0:01mm:

6 Sample preparation and humidity conditioning

6:1 The sample should be cut at 1/10 of the width from the edge of the fabric and 2m from the end of the piece, and the sample should be representative: 6:2 Cut at least three samples from each sample, each with a diameter of 70mm: For samples with different materials on both sides (e:g: coatings fabric), unless otherwise specified, three samples shall be taken from each side and shall be stated in the test report: 6:3 For the coated fabric, the sample shall be flat and uniform, and shall not have defects such as holes, pinholes, wrinkles and scratches: 6:4 For samples requiring higher test accuracy, another sample should be taken for blank test: 6:5 The sample shall be conditioned according to the provisions of GB/T 6529:

7 Test conditions

The test conditions of group a) are preferred: If necessary, group b), group c) or other test conditions can be used: a) Temperature (38±2)℃, relative humidity (90±2)%; b) Temperature (23±2)℃, relative humidity (50±2)%; c) Temperature (20±2)℃, relative humidity (65±2)%:

8 Test steps

8:1 Put about 35g of the desiccant specified in 5:3:3 into the clean and dry moisture-permeable cup, and shake it evenly to make the desiccant form a flat surface: Dry The filling height of the desiccant is about 4mm from the position of the lower surface of the sample: No desiccant was added to the cup of the blank test: 8:2 Place the sample on the moisture permeable cup with the test surface facing up, install the gasket and the pressure ring, screw on the nut, and then seal the pressure with vinyl tape from the side: Rings, gaskets, and breathable cups make up the test assembly: Note: Steps 8:1 and 8:2 should be completed in as short a time as possible: 8:3 Quickly place the test assembly horizontally in the test chamber (chamber) that has reached the test conditions specified in Chapter 7, and equilibrate for 1 h: take out: 8:4 Quickly cover the corresponding cup, put it in a silica gel desiccator at about 20°C for 30min, and weigh it one by one according to the serial number, accurate to 0:001g: The weighing time of each test combination shall not exceed 15s: 8:5 After weighing, shake the desiccant in the cup slightly to mix it up and down, so as to avoid using the upper layer of desiccant for a long time to weaken the drying effect: During the vibration process, try to avoid contacting the desiccant with the sample: 8:6 Remove the lid of the cup, quickly put the test assembly into the test box, take it out after the test time of 1h, and weigh it according to the provisions of 8:4: The sequence of weighing the test combination should be consistent: Note: If the moisture permeability of the sample is too small, the test time of 8:6 can be extended and explained in the test report: 8:7 The total increase of desiccant moisture absorption shall not exceed 10%:

9 Result calculation

9:1 The moisture permeability of the sample is calculated according to formula (1): The test results are expressed as the average value of three samples, and the results are rounded to three digits according to GB/T 8170: GB/T 12704:1-2009 ......

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