YY/T 1632-2018Water resistance of textiles for medical protective apparel—Impact penetration test (English PDF)

Foreword

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

Please be noted that certain content in this document might involve patents. The institution that issues this document does not undertake the responsibility of identifying these patents.

1 Scope

This Standard stipulates the principle, operating procedures, result and evaluation, and laboratory report of impact penetration test method for water resistance of textiles for medical protective apparel.

This Standard is applicable to the evaluation of water resistance of textiles for medical protective apparel with or without waterproof finishing.

This Standard is inapplicable to textiles for medical protective apparel that cannot maintain a flat state under tension (hereinafter referred to as textiles).

2 Normative References

The following documents are indispensable to the application of this document. In terms of references with a specified date, only versions with a specified date are applicable to this document. In terms of references without a specified date, the latest version (including all the modifications) is applicable to this document.

GB/T 6529 Textiles - Standard Atmospheres for Conditioning and Testing

GB/T 6682 Water for Analytical Laboratory Use - Specification and Test Methods

3 Terms and Definitions

The following terms and definitions are applicable to this document.

4 Principle

Spray a certain volume of water onto the surface of a sample. By weighing the mass change of the water-absorbent paper under the sample before and after the spraying, evaluate the sample's water resistance.

5 Instruments and Textiles

6 Test Preparation

At least cut off 3 samples from textiles. Sample dimensions are: (330 ± 10) mm x (178 ± 10) mm. If applicable, the samples' lengthwise direction shall be warp-wise.

Before the test, conduct temperature and humidity adjustment treatment on the samples and the water-absorbent paper in accordance with the stipulations in GB/T 6529. The treatment conditions are: relative humidity (65 ± 2) %; temperature (21 ±

1) °C; treatment duration shall be at least 4 h.

7 Operating Procedures

7.1 Use a spring clip with the chuck width of (152 ± 10) mm to clamp one end of the sample on the top of the tester's bevel. Use another spring clip with the mass of (0.45 ± 0.05) kg and the chuck width of (152 ± 10) mm to clamp at the free end of the sample.

7.2 Weigh standard water-absorbent paper, accurate to 0.1 g. Insert it under the sample.

7.3 Adjust the position of the nozzle, so that the center of the sample is (610 ± 10) mm below the center of the nozzle surface.

7.4 Promptly and steadily inject (500 ± 10) mL of water (5.3) into the funnel of the tester; make the water continuously spray onto the sample. When injecting the water into the funnel, DO NOT generate vortex in the funnel; the spraying time shall be controlled within 50 s.

7.5 After the entire spraying is finished (2 s after the fluid flow stops), carefully pick up the sample. Remove the water-absorbent paper, then, quickly weigh it, accurate to 0.1 g.

8 Result and Evaluation

The water resistance test result of each sample is the increase in mass before and after the test of the water-absorbent paper, expressed in grams (g). The result of textiles' water resistance is the average value of the test results of all samples.

When the test result of a single sample or the average test value is larger than 5.0 g, it may be expressed as "+ 5.0 g" or " > 5.0 g" in the test report.

9 Laboratory Report

Laboratory report shall at least include the following content:

a) Serial No. of this Standard;

b) All the necessary information for the identification of test samples;

c) Quantity of test samples;

d) Environmental conditions (such as: temperature and humidity) of pre-treatment and tests;

e) Any deviation from the specific test procedures in this Standard; f) Test result.

Figure 1 -- Type-I Water Permeability Tester

Figure 2 -- Type-II Water Permeability Tester Unit: millimeter Keys: 1---glass funnel, 152 mm; 2---ring bracket; 3---metal rod, phi 12.7 mm; 4---rubber tube, phi 9.5 mm; 5---metal spring clip; 6---steel plate; 7---base; 8---spray nozzle (see the structure in A in this Figure);

9---25 holes, (0.99 ± 0.0055) mm; a---brass (texture of sieve plate); b---bronze (texture of spray nozzle).

Figure 3 -- Structure of Impact Water Permeability Tester Bibliography [1] AATCC Test Method 42-2013 Water Resistance: Impact Penetration Test [2] ISO 18695:2007 Textiles - Determination of Resistance to Water Penetration - Impact Penetration Test