GB/T 4744-2013 Hydrostatic pressure method for testing and evaluation of waterproof properties of textiles

More and more manufacturers choose to perform waterproof finishing on fabrics. Manufacturers have certain requirements and related standards for the waterproof performance and hydrostatic pressure resistance of fabrics, such as GB/T 4744-2013 Textile Waterproof Performance Test Standard.

1.Principle:

The hydrostatic pressure experienced by the fabric represents the resistance encountered by water penetrating the fabric. Under standard atmospheric conditions, one side of the sample is subjected to a continuously rising water pressure until three water seepage points appear on the other side. The pressure value when the third water seepage point appears is recorded and used to evaluate the sample. Waterproof properties.

2. Anti-hydrostatic pressure level:

The degree to which a fabric resists penetration by water.

3. Instrument: hydrostatic pressure tester;

Sample A is clamped horizontally and does not bulge;

The area of sample B is 100cm;

C During the test of the specimen, the clamping device must not leak;

D sample does not slip in the clamping device;

ETry to reduce the possibility of water seepage on the edge of the specimen at the edge of the clamping device

4. Test water:

Sample:

The temperature of distilled or deionized water in different parts of the fabric should be maintained at (20 ± 2) % or 5 samples should be cut out and should not be at (27 ± 2) C. Experiment on areas with deep folds or creases. If it is necessary to measure the hydrostatic pressure value at the joint, the joint should be located in the middle of the specimen.

1. Wipe the experimental water on the holding surface, and clamp the sample so that the front side of the sample is ISTEST

GB/T 4744-2013

Testing and evaluation of textile waterproofing properties Hydrostatic pressure method

1. Wipe the experimental water on the holding surface, and clamp the sample so that the front side of the sample

Contact with water.

2. Apply continuous pressure to the sample at a water pressure rise rate of 60cmH2O/min

Increase the water pressure and observe water seepage.

3. Record the hydrostatic pressure value when the third water droplet first appears on the sample.

Note: If the fabric breaks and water sprays out or the composite fabric bulges when filled with water during the test, record the hydrostatic pressure value at this time and explain the test phenomenon in the report.

5. Relevant product standards:

“GB/T 28464- 2012 Textiles – Coated fabrics for clothing”

Type I ≥ 15kpa Type II ≥ 30kpa Type I ≥ 30kpa Type IV ≥ 60kpa

“GB/T 21295-2014 Technical Requirements for Physical and Chemical Properties of Clothing”

The hydrostatic pressure required for rainproof function is not less than 13kpa, and the hydrostatic pressure resistance of finished products required for heavy rainproof function is not less than 35kpa.;

“GB/T 32614-2016 Outdoor Sportswear Jackets”

Grade I product, fabric resistance to hydrostatic pressure ≥50kPa before washing, fabric seams ≥40kPa. Fabric resistance to hydrostatic pressure after washing ≥40kPa, fabric seams ≥30kPa:

For Grade II products, the hydrostatic pressure resistance of the fabric before washing is ≥30kPa, and the seams of the fabric are ≥25kPa. The hydrostatic pressure resistance of the fabric after washing is ≥20kPa, and the seams of the fabric are ≥15kPa.

6. Notes:

1. Experimental water: distilled water or deionized water.

2. When taking samples, tests should not be conducted on areas with deep wrinkles or creases.

3. Before testing, check whether there is water on the surface of the clamping ring and wipe it clean.

4. When clamping the sample, make the surface of the sample contact the water, and there should be no air between the sample and the water.

5. If the test results are uneven, the single values of the test results should be reported separately.

6. If the front side of the specimen cannot be determined, the single-sided coated fabric coating-side is in contact with the water.Touch, other.

7. Test both sides separately and report the results separately.

8. If the third water drop appears on the edge of the clamping device, resulting in a net water pressure of the third water drop.

9. If the value is lower than the low value of other samples of the same sample, the data will be eliminated, and the sample will be added for another experiment.

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