1、 WORLDWIDE ENGINEERING STANDARDS Test Procedure GMW14134 Leather Depression Copyright 2011 General Motors Company All Rights Reserved November 2011 Originating Department: North American Engineering Standards Page 1 of 2 1 Scope Note: Nothing in this standard supercedes applicable laws and regulatio
2、ns. Note: In the event of conflict between the English and domestic language, the English language shall take precedence. 1.1 Purpose. This procedure is used to determine the depression depth of a leather sample under the 5 mm load plunger of a BLC ST300 Leather Softness Tester. This test is primari
3、ly intended for determining a relative rating for softness of finished and unfinished leathers. The depression depth of the load plunger is defined by the covered distance in millimeters at the calibrated pressure of 0.5 Pa. 1.2 Foreword. Not applicable. 1.3 Applicability. This standard applies to a
4、ll seating, steering wheel and IP leather constructions. 2 References Note: Only the latest approved standards are applicable unless otherwise specified. 2.1 External Standards/Specifications. None 2.2 GM Standards/Specifications. GMW3221 2.3 Additional References. MSA ST300 Leather Softness Tester
5、Operating Manual 3 Resources 3.1 Facilities. Not applicable. 3.2 Equipment. 3.2.1 BLC ST300 Softness Tester. 3.2.2 Twenty-five millimeter (25 mm) Reducing Ring. Note: The BLC ST300 Softness Tester is available for purchase from: MSA Engineering Systems Limited 12 Shibden Hall Croft, Shibden Hall Roa
6、d, Halifax, West Yorkshire, HX3 9XF, United Kingdom Phone: +44 (0) 1422 203698 3.3 Test Vehicle/Test Piece. Not applicable. 3.4 Test Time. Not applicable. 3.5 Test Required Information. Not applicable. 3.6 Personnel/Skills. Not applicable. 4 Procedure Specimens are placed under the load bin on the s
7、urface of the bottom leather clamp. The Top Arm of the ST300 is then depressed using the Operating Lever only. 4.1 Preparation. Take one specimen 300 mm 10 mm x 300 mm 10 mm from a hide in the specified area as shown in Section 3.2 of the MSA ST300 Leather Softness Tester Operating Manual. If the hi
8、de is not to be cut, it should be fully supported so that there is no pull or tension on the area to be tested. 4.2 Conditions. 4.2.1 Environmental Conditions. All test specimens shall be conditioned to GMW3221, Code A. 4.2.2 Test Conditions. Deviations from the requirements of this standard shall h
9、ave been agreed upon. Such requirements shall be specified on component drawings, test certificates, reports, etc. 4.3 Instructions. 4.3.1 Ensure that the ST300 has been calibrated so that it is reading zero. 4.3.2 Release the Top Arm by applying a downward pressure to the Operating Lever and pressi
10、ng the Release Button. The Top Arm should then swing upward. 4.3.3 Place the leather specimen with the grain side up in the Tester so that it covers the Bottom Leather Clamp completely. Make sure that there is no tension on the specimen in the area to be tested. 4.3.4 Lower the Top Arm by pressing d
11、own on the Operating Lever. The Load Plunger must be retracted while the Top Arm is being lowered. Once the Top Arm is down, there will be an audible click and the leather is now clamped in the Tester. 4.3.5 Release the Operating Lever. Copyright General Motors Company Provided by IHS under license
12、with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW14134 Copyright 2011 General Motors Company All Rights Reserved November 2011 Page 2 of 2 4.3.6 The measurement is to be taken 30 s 2 s after releasing
13、the Operating Lever. 4.3.7 Repeat 4.3.2 through 4.3.6 for a total of nine readings. Readings are to be taken following Figure 1. Figure 1: Reading Locations on Sample 5 Data 5.1 Calculations. Report the average of the nine data points to the nearest 0.1 mm. 5.2 Interpretation of Results. Not applica
14、ble. 5.3 Test Documentation. Not applicable. 6 Safety This standard may involve hazardous materials, operations, and equipment. This standard does not propose to address all the safety problems associated with its use. It is the responsibility of the user of this standard to establish appropriate sa
15、fety and health practices and determine the applicability of regulatory limitations prior to use. 7 Notes 7.1 Glossary. Not applicable. 7.2 Acronyms, Abbreviations, and Symbols. Not applicable. 8 Coding System This standard shall be referenced in other documents, drawings, etc., as follows: Test to
16、GMW14134 9 Release and Revisions This standard was originated in May 2005. It was first approved by the Global Textile Development Group Conference at GMNA in May 2005. It was first published in August 2006. Issue Publication Date Description (Organization) 1 AUG 2006 Initial publication. 2 NOV 2011 Five year refresh of standard updated in current template. (Textiles Global Subsystem Leadership Team) Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
