1、WORLDWIDEENGINEERINGSTANDARDSTest Procedure GMW14692Methods of Test for Sound Deadener Pads;Test for Low Temperature Resistance Copyright 2012 General Motors Company All Rights ReservedOctober 2012 Originating Department: North American Engineering Standards Page 1 of 21 ScopeNote: Nothing in this s
2、tandard supercedesapplicable laws and regulations.Note: In the event of conflict between the Englishand domestic language, the English language shalltake precedence.1.1 Purpose. This test method shall be used todetermine the resistance to low temperature ofbaked deadener pads.Low temperature resista
3、nce as determined by thistest method shall be defined as the ability of abaked deadener material to withstand impactforces at specified low temperatures.1.2 Foreword. Not applicable.1.3 Applicability. Not applicable.2 ReferencesNote: Only the latest approved standards areapplicable unless otherwise
4、specified.2.1 External Standards/Specifications.None2.2 GM Standards/Specifications.GMW2 GMW32212.3 Additional References.None.3 Resources3.1 Facilities. Not applicable.3.2 Equipment.3.2.1 Test apparatus for conditioning to GMW3221Code A.3.2.2 Tests shall be performed using speciallyprepared test pa
5、nels, (250 x 50) mm minimumx (1 0.2) mm, made from GMW2M-ST-S. Thepanels shall be prepared according to Paragraph4.3.5.3.2.3 Any forced-air drying oven capable ofmaintaining the specified temperatures within thespecified tolerances.3.2.4 Refrigerator capable of maintaining(-25 to 3) C.3.2.5 Steel pl
6、ate (250 x 200 x 10) mm minimum.3.2.6 Xylene or equivalent solvent.3.3 Test Vehicle/Test Piece.3.3.1 The test pieces (250 0.5) mm x(50 0.5) mm x thickness of deadener pad shallbe taken at various points from the availablematerial. The direction of sampling is unimportant.3.3.2 For initial sample app
7、roval and arbitrationpurposes, at least three (3) test pieces shall betested. For routine quality control, at least one (1)test piece shall be tested.3.4 Test Time. Not applicable.3.5 Test Required Information. Not applicable.3.6 Personnel/Skills. Not applicable.4 Procedure4.1 Preparation. Test piec
8、es shall be conditionedto GMW3221 Code A.4.2 Conditions.4.2.1 Environmental Conditions. Not applicable.4.2.2 Test Conditions. Deviations from therequirements of this standard shall have beenagreed upon. Such requirements shall be specifiedon component drawings, test certificates, reports,etc.4.3 Ins
9、tructions.4.3.1 The prepared test panels shall be cleanedwith xylene (or equivalent) and allowed to dry.4.3.2 The conditioned test pieces shall be placedon the cleaned test panels and subjected to thebaking conditions specified (see 4.3.5).4.3.3 The test assembly produced shall be allowedto cool to
10、(-25 3) C for 16 to 24 hours.4.3.4 The test assembly shall be removed from therefrigerator and immediately dropped from thespecified height of 0.5 m onto the steel plate,ensuring that the steel test panel faces downward.Copyright General Motors Company Provided by IHS under license with General Moto
11、rs CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW14692 Copyright 2012 General Motors Company All Rights ReservedOctober 2012 Page 2 of 24.3.5 Panel Preparation. The test panels shall beprimed or topcoated corresponding
12、 to theapplication of the deadener.4.3.6 Baking Conditions. Unless otherwiseindicated, the baking conditions in Table 1 shallapply to the test pieces.Table 1: Bake ConditionsBakeDescriptionMinimum(Time at MetalTemperature)Maximum(Time at MetalTemperature)StandardProcess- Paint Shop(Use forMaterial T
13、ypes1 thru 5)15 minutesat 125 C Note 1(257 F) Note 160 minutesat 190 C Note 2(374 F) Note 2Non-Compressed3-Wet Process- Paint Shop(Use forMaterial Types1A thru 5A)3-Wet10 minutes at140 C(285 F) Note 33-Wet20 minutes at163 C(325 F) Note 3Note 1: Represents the minimum bake for a Low Bake,Solventborne
14、 Primer Surfacer.Note 2: Represents the maximum bake for a High Bake,Powder Primer Surfacer.Note 3: Represents the minimum/maximum bake for a 3-WetSealer Oven.5 Data5.1 Calculations. Not applicable.5.2 Interpretation of Results.5.2.1 After impact, the test assembly shall beallowed to return to (+23
15、5) C and examinedwith the naked eye for cracking, delamination, etc.5.2.2 Unless otherwise specified, no test assemblyshall show any separation at the deadener/testpanel interface, cracking of the deadener, or anyother deterioration detrimental to serviceability.5.3 Test Documentation. The test resu
16、lts shall berepresented in a test report.6 SafetyThis standard may involve hazardous materials,operations, and equipment. This standard does notpropose to address all the safety problemsassociated with its use. It is the responsibility of theuser of this standard to establish appropriate safetyand h
17、ealth practices and determine theapplicability of regulatory limitations prior to use.7 Notes7.1 Glossary.Low Temperature Resistance: The ability of abaked deadener material to withstand impactforces at specified low temperatures.7.2 Acronyms, Abbreviations, and Symbols. Notapplicable.8 Coding Syste
18、mThis standard shall be referenced in otherdocuments, drawings, etc., as follows:Low Temperature Resistance to GMW146929 Release and RevisionsThis standard was originated in October 2005. Itwas first approved by the Global Materials Team inFebruary 2007. It was first published in July 2007.Issue Pub
19、licationDate Description (Organization)1 JUL 2007 Initial publication.2 OCT 2012 Five-year refresh. (GlobalDamper Material Team)Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
