GB/T 33732-2017Textiles -- Determination of resistance to water penetration -- Impact penetration test (English PDF)

Foreword

This Standard was drafted as per the rules specified in GB/T 1.1-2009 and GB/T

20000.2-2009.

This Standard adopts re-drafting method to modify and use ISO 18695.2007 Textiles

- Determination of Resistance to Water Penetration - Impact Penetration Test.

Compared with ISO 18695.2007, this standard has the major technical differences and

causes as follows.

--- On the normative reference documents, this Standard has made the adjustment

of technical differences, so that adapt to China's technical conditions; the

adjustment situations focus on reflecting on the Clause 2 "Normative

References"; use GB/T 6529 that modifies and adopted the international

standard to replace ISO 139 (see Clause 8).

--- Modify two instrument physical diagrams in ISO 18695.2007 into schematic

diagram; delete the corresponding 7.1.1 and 7.1.2, so that facilitate the

understanding of the corresponding clauses.

--- Supplement the contents of Item f) in Clause 12 of ISO 18695.2007; add the

report test surface and report value situations, so that the report can be more

complete.

For ease of use, this Standard made the following editorial changes as follows.

--- Modify the terminology in 3.1 of ISO 18695.2007 into "resistance to penetration

by water";

--- Adjust the Footnote 1 and Footnote2 in ISO 18695.2007 into the NOTEs in 7.1

and 7.2; and simplify them;

--- Adjust the metal spring clip quality requirements in structural diagram of ISO

1 Scope

This Standard specifies the test method to measure the fabric resistance to water

penetration under the low impact conditions. This method can be used to predict the

anti-rain and pervaporation properties of fabrics.

This Standard is applicable to the fabrics been subject to or not been subject to the

waterproof or water repellent finishing. Compared with severe-role of Bounds method

(GB/T 14577) or leaching method (GB/T 23321), this method is more suitable for

fabrics with medium loose structures.

This Standard is not applicable to the fabrics that can't be flattened under certain

tension conditions.

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 document.

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 are applicable to this document.

4 Principle

Spray a certain amount of water, on the height of (610+/-10) mm away from to-be-tested

8 Atmosphere for Conditioning

Perform conditioning against the specimen according to the standard atmospheric

conditions stipulated in GB/T 6529; the conditioning of specimen and absorbent water

shall be performed at least 4h.

9 Specimen

Cut at least 3 blocks of specimen with size of (178+/-10) mm x (330+/-10) mm from the

to-be-tested sample; the warp (or longitudinal) of the fabric shall be consistent with the

specimen length direction.

10 Procedures

11 Result Calculation and Expression

Take the increasing amount of absorbent paper mass in the test as the penetration

amount; calculate the average value of at least 3 blocks of specimens, in "g".

When the average value of the specimen test results or single specimen test value

exceeds 5g, it can be expressed by "+5g" or " >5g" simply.

12 Test Report

The test report shall contain the following contents.

a) This Standard number, namely, GB/T 33732-2017;

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