GB/T 4744-2013Textiles -- Testing and evaluation for water resistance -- Hydrostatic pressure method (English PDF)

Foreword

This Standard was drafted in accordance with the rules given in GB/T 1.1-2009.

This Standard replaces GB/T 4744-1997 "Textile fabrics - Determination of

resistance to water penetration - Hydrostatic pressure test". Compared with

GB/T 4744-1997, main differences in this Standard are as follows:

- modified the standard's name;

- modified the application scope of Clause 1;

- added Clause 3; and the relevant clauses after clause 3 are incremented;

- deleted the water pressure rise rate in 5.3 as 1.00kPa/min±0.05kPa/min;

- merged and simplified two articles in Clause 6;

- added sampling of joint sample in Clause 7;

- respectively added notes in 8.2, 8.3 and 8.4; deleted the reading accuracy

of 8.4;

- added 9.2;

- deleted Annex A.

This Standard uses redrafting method to modify and adopt ISO 811:1981

"Textile fabrics - Determination of resistance to water penetration - Hydrostatic

pressure test". Compared with ISO 811:1981, the main differences in this

Standard are as follows:

- modified the standard's name;

- modified the application scope of Clause 1;

- added Clause 3; and the relevant clauses after clause 3 are incremented;

- simplified the principle of Clause 4;

- modified the chapter numbers of Clause 5; deleted the water pressure rise

rate in 5.3 as 1.00kPa/min±0.05kPa/min;

- added sampling of joint sample in Clause 7;

- modified Clause 8 as descriptions in sub-clauses; respectively added notes

in 8.2, 8.3 and 8.4; deleted the reading accuracy of 8.4;

Textiles - Testing and evaluation for water resistance -

Hydrostatic pressure method

1 Scope

This Standard specifies the method that uses hydrostatic pressure test to

determine water resistance of textiles and gives evaluation on water resistance.

This Standard is applicable to various fabrics (including composite fabrics) and

their products.

2 Normative references

The following referenced documents are indispensable for the application of

this document. For dated references, only the edition cited applies. For undated

references, the latest edition of the referenced document (including any

amendments) applies.

GB/T 6529, Textiles - Standard atmospheres for conditioning and testing

(GB/T 6529-2008, ISO 139:2005, MOD)

3 Terms and definitions

For the purposes of this document, the following terms and definitions apply.

7 Specimen

After sampling, minimize handling of specimen. Avoid forceful folding. Do not

conduct other treatments except humidity conditioning (such as ironing). Cut at

least 5 specimens from different parts of the fabric. The size of the specimen

shall be able to meet the requirements of the test area. The specimen shall be

as representative as possible. It may test without cutting the specimen.

It shall not test in areas with deep wrinkles or creases. If it is necessary to

determine the hydrostatic pressure at the joint, the joint shall be located in the

middle of the specimen.

8 Steps