1、 WORLDWIDE ENGINEERING STANDARDS Test Procedure GMW14140 Water Vapor Permeability of Upholstery Trim Materials Copyright 2011 General Motors Company All Rights Reserved October 2011 Originating Department: GME Specification Center Page 1 of 4 1 Scope Note: Nothing in this standard supersedes applica
2、ble laws and regulations. Note: In the event of conflict between the English and domestic language, the English language shall take precedence. 1.1 Purpose. This standard shall be used to determine water vapor permeability of leather and textiles used as upholstery trim material. 1.2 Foreword. Water
3、 Vapor Permeability is a parameter which characterizes the comfort factor of leather on a seat in contrast to artificial leather. 1.3 Applicability. Upholstery material (leather, fabric, plastic roll goods). 2 References Note: Only the latest approved standards are applicable unless otherwise specif
4、ied. 2.1. External Standards/Specifications. ISO 261 ISO 2768 2.2. GM Standards/Specifications GMW3221 3 Test Equipment 3.1 Analytical Balance accurate to 1 mg. 3.2 Cylindrical test vessel of aluminum with screw cover (see Appendix A, Figure A1). Note: The hole diameter of the cover is 36 mm for a t
5、otal test area of 10 cm. 3.3 Apparatus for conditioning according to GMW3221. 3.4 Desiccator cabinet of sufficient size to accommodate the test vessel. 3.5 Cutting dies or shears for preparation of test pieces. 4 Test Material 4.1 Test Pieces and Number of Test Pieces. 4.1.1 From the available mater
6、ial, circular test pieces, (55 to 60) mm in diameter, uniformly distributed over the complete width, shall be taken. 4.1.2 For initial sample approval and arbitration purposes at least 4 test pieces and routine quality control at least 2 test pieces shall be tested. 4.2 1000 g silica gel (dried prio
7、r to each test for 2 h at (+105 3) C). 4.3 Deionized water. 5 Test Method 5.1 Summary of Test Method. A water filled test vessel is closed by the test piece and exposed to a dry environment. The vapor leaving the test vessel through the test piece is determined by weighing test vessel and test piece
8、 before and after the exposure. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW14140 Copyright 2011 General Motors Company All Rights Reserved October 2011 Page 2 of 4 5.2 Test Sample Preparation. 5.2.1 For init
9、ial sample approval and arbitration purposes, conditioning shall be performed according to GMW3221 Code D. 5.2.2 Routine quality control tests may be performed on test pieces in the as received condition (i.e. no special pre-conditioning). 5.3 Test Procedure. 5.3.1 The test shall be performed immedi
10、ately after conditioning, or in the as received condition at a temperature of (+23 5) C. 5.3.2 The test vessel shall be filled with 50 ml deionized water, the test piece is placed in test position, and the side of the test specimen touched by the vehicle customer is placed towards the water in the v
11、essel. The cover shall then be tightly screwed down. 5.3.3 The closed test assembly shall be weighed to the nearest 1 mg and stored in the desiccators filled with 1000 g silica gel for (46 to 48) h. 5.3.4 After this test period the test assembly shall be reweighed to the nearest 1 mg. 6 Evaluation a
12、nd Rating 6.1 The water vapor permeability shall be calculated on the basis of the mass decrease in mg per 24 h referred to 10 cm test area (orifice area of screw-on cover). 6.2 The formula for calculation as follows: Water vapor permeability = h24cm10 mg2 GG 21 G1 = Mass of test system prior to sto
13、ring in desiccators in mg G2 = Mass of test system after storing in desiccators in mg 6.3 Deviations from the requirements of this standard shall have been agreed upon. Such requirements shall be specified on component drawings, test certificates, reports, etc. 7 Report For tests to this test method
14、, the water vapor permeability shall be recorded as the arithmetic average of the measured individual values rounded to the nearest 1 mg in mg/(10 cm2 x 24 h). 8 Safety This standard may involve hazardous materials, operations, and equipment. This standard does not propose to address all the safety
15、problems associated with its use. It is the responsibility of the user of the method to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. 9 Notes 9.1 Glossary. Water vapor permeability: As determined by this test procedure is de
16、fined as the quantity of water vapor that permeates through a standard test area of material in a given time, when the material is surrounded on one side by totally water saturated air, and on the other side by totally dry air. 9.2 Acronyms, Abbreviations, and Symbols. Not applicable. Provided by IH
17、SNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW14140 Copyright 2011 General Motors Company All Rights Reserved October 2011 Page 3 of 4 10 Coding System This standard shall be referenced in other documents, drawings, etc., as
18、 follows: Example: Water Vapor Permeability to GMW14140 350 mg/(10 cm x 24 h) minimum (1) Designation - Water Vapor Permeability (2) Test Procedure to GMW14140 (3) Requirement 350 mg (10 cm x 24 h) minimum 11 Release and Revisions This standard was originated in May 2005. It was first approved by th
19、e Global textile Committee in May 2005. It was first published in September 2005. Issue Publication Date Description (Organization) 1 SEP 2005 Initial publication. 2 OCT 2011 5-Year-Refresh, NOT TO TEMPLATE (Worldwide Fabric Specification Team) Provided by IHSNot for ResaleNo reproduction or network
20、ing permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW14140 Copyright 2011 General Motors Company All Rights Reserved October 2011 Page 4 of 4 Appendix A Figure A1: Test Vessel (All dimensions in mm) General tolerances according to ISO 2768-m m 136 g Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
