GMW-4141-2006.pdf
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1、 WORLDWIDE ENGINEERING STANDARDS Test Method Materials GMW4141 Pile Distortion - Environmental Copyright 2006 General Motors Corporation All Rights Reserved January 2006 Originating Department: North American Engineering Standards Page 1 of 2 1 Scope This test shall be used to determine the ability
2、of pile fabrics to resist appearance change due to environmental conditions of heat and humidity un- der a load. Note: Nothing in the specification supersedes ap- plicable laws and regulations unless specific ex- emption has been obtained. Note: In the event of conflict between the English and domes
3、tic language, the English language shall take precedence. 2 References Note: Only the latest approved standards are ap- plicable unless otherwise specified. 2.1 External Standards/Specifications. None 2.2 GM Standards/Specifications. GMW3221 3 Test Equipment 3.1 Conditioning Chamber. A conditioning
4、cham- ber capable of maintaining an environment of 50 3C and 35 5% Relative Humidity. 3.2 Glass Plate. One glass plate having the ap- proximate dimensions 100 x 100 x 5 mm. 3.3 Weight. One 1 0.01 kg weight having a flat base of 40 5 mm in diameter. 3.4 Brush. Soft toothbrush, or equivalent. 3.5 Cutt
5、ing dies or shears for preparation of test specimens. 3.6 Apparatus for conditioning to the appropriate requirements as described in GMW3221 Code A, unless otherwise specified in the relevant materials specification. 4 Test Material Not applicable. 5 Test Method 5.1 Summary of Test Method. This Test
6、 Method assesses the ability of a pile fabric to retain its ap- pearance after a weight is placed in a localized area for a prescribed period of time while exposed to a moderately high temperature and humid envi- ronment. 5.2 Test Sample Preparation. 5.2.1 At least one test specimen 80 5 mm x 80 5 m
7、m shall be prepared. 5.2.2 Unless otherwise specified in the relevant materials specification, conditioning shall be per- formed according to GMW3221 Code A. 5.3 Test Procedure. 5.3.1 Pre-condition the weight and glass plate for a minimum of 2 hours in a conditioning chamber which has been stabilize
8、d at 50 3C and 35 5% Relative Humidity. 5.3.2 Inside the conditioning chamber, place the test specimen face-up on the glass plate and place the weight centrally on the test specimen. 5.3.3 Condition the assembly in this environment for 6 0.25 hours. 5.3.4 Remove the weight from the test specimen and
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