AATCC 35 pdf free download

AATCC 35 pdf free download.Test Method for Water Resistance: Rain.
3. Terminology
3.1 water resistance, n.—offiibric, the characteristic to resist wetting and penetration by water. (See also water repellencv.)
4. Safety Precautions
NOTE: These safety precautions are for information purposes only. The precautions are ancillary to the testing procedures and are not intended to be all inclusive. It is the user’s responsibility to use safe and proper techniques in handling materials in this test method. Manufacturers MUST be consulted for specific details such as material safety data sheets and other manufacturer’s recommendations. All OSHA standards and rules must also be consulted and followed.
4.1 (iood laboratory practices should be followed. Wear safety glasses in all laboratory areas.
5. Apparatus and Materials
5.1 AATCC Rain Tester (see Figs. 1, 2 and3 and 11.3).
5.2 White AATCC Textile Blotting Paper (see 11.4).
6. Test Specimens
6.1 A minimum of three specimens of
20 x 20 cm is cut from the test fabric. The fabric samples and the blotting paper should be conditioned in an atmosphere of 65 ± 5% RH and 21 ± 2°C (70 ± 4°F) for at least 4 h before testing.
7. Procedure
7.1 The test specimen (see 11 .5),backed by a 15.2 x 15.2 cm standard paper blotter weighed to the nearest 0.1 g is clamped in the specimen holder and the assembly is mounted in a vertical rigid support frame. The specimen assembly is positioned into the central portion of the spray at a distance of 30.5 cm from the face of the spray nozzle (see 11.6). A horizontal water spray at 27 ± 1°C (81 ± 2°F) (see 11.2) is directed against the specimen and is allowed to continue for a period of 5 mm. At the end of the spray period the blotter is carefully removed and quickly reweighed to the nearest 0.1 g.
8. Evaluation
8.1 Water penetration as indicated by the increase in mass of the blotting paper during the 5 mm test period is calculated. and the average for the three test specimens is reported. Individual determinations or average values of over 5.0 g may be simply reported to 5 + g or> 5 g.
8.2 In order to obtain a complete overall picture of the penetration resistance of a fabric or fabric combination the average penetration with different pressure heads on the nozzle should be obtained. The pressure head should be varied by 300 mm increments in order to detennine (a) the maximum head at which no penetration occurs, (b) the change in penetration with increasing head and (c) the minimum head required to cause “breakdown” or the penetration of more than 5 g of water. At each pressure head a minimum of three specimens should be tested in order to obtain the average penetration for that head.
9. Report
9.1 Report the individual determinations. For values of over 5.0 g simply reportas5+gor>5 g.
10. Precision and Bias
10.1 Precision. Precision for this test method has not been established. Until a precision statement is generated for this test method, use standard statistical techniques in making any comparisons of test results for either wil hin-laboivtori or between-laboratoiy averages.
10.2 Bias. The bias derived by this procedure can be deli ned only in terms of a test method. There is no independent, referee test method by which bias may be determined. This test method has no known bias.AATCC 35 pdf download.