GB/T 4745-2012Textiles -- Testing and evaluation for water resistance -- Spray test method (English PDF)

Foreword

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

and GB/T 20000.2-2009.

This standard replaces GB/T 4745-1997 "Textiles - Testing and evaluation for

water resistance - Spray test method". Compared with GB/T 4745-1997, this

standard has the following main differences:

- MODIFY the standard name;

- ADD two terms: water resistance and face (see 3.1 and 3.3);

- ADD the tolerance of specific parameters in the test device (see 5.1, 5.2,

5.3);

- REFINE the spray rating to half level (see 9.1);

- ADD water resistance evaluation (see 9.2);

- In Appendix A, ADD the images and corresponding descriptions of level 0

(see Appendix A).

This standard uses the redrafting method to amend and adopt ISO 4920:2012

"Textiles fabrics - Determination of resistance to surface wetting (spray test)".

Compared with ISO 4920:2012, the main differences between this standard are

as follows:

- MODIFY the standard name;

- ADD the term of water resistance (see 3.1);

- REFINE the spray rating to half level (see 9.1);

- ADD the water resistance evaluation (see 9.2);

- In Appendix A, ADD the corresponding relationship between GB and ISO

spray rating.

This standard was proposed by the China National Textile and Apparel Council.

This standard shall be under the jurisdiction of the Basic Standards

Subcommittee of the National Textile Standardization Technical Committee

(SAC/TC 209/SC 1).

Drafting organizations of this standard: Textile Industry Standardization

Research Institute, Hutai (Panyu) Textile Printing and Dyeing Co., Ltd.

Textiles - Testing and evaluation for water resistance -

Spray test method

1 Scope

This standard specifies the method for measuring the water resistance of

fabrics by the spray test; gives an evaluation of the water resistance.

This standard applies to fabrics with or without waterproof finishing.

This standard is not applicable to the determination of the water permeability of

fabrics, nor to the prediction of the rain-proof permeability of fabrics.

2 Normative references

The following documents are essential to the application of this document. For

the dated documents, only the versions with the dates indicated are applicable

to this document; for the undated documents, only the latest version (including

all the amendments) are applicable to this standard.

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

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

3 Terms and definitions

The following terms and definitions apply to this document.

3.1

Water resistance

The fabric's resistance to being wetted and penetrated by water. The

indicators of the water resistance of the fabric include the spray rating, the

hydrostatic pressure resistance level, the amount of water penetration.

3.2

Spray rating

The degree to which the surface of the fabric resists being wetted by water.

3.3

6 Atmosphere for humidity control and test

The standard atmosphere for humidity control and test shall be implemented in

accordance with the requirements of GB/T 6529. With the permission of

relevant parties, humidity control and testing can be carried out at room

temperature or under actual conditions.

7 Specimen

Take at least three specimens from different parts of the fabric. Each specimen

shall be at least 180 mm × 180 mm in size. The specimen shall be

representative and there shall be no wrinkles or creases in the sampling

location.

8 Steps