1、WORLDWIDEENGINEERINGSTANDARDSMaterial Specification GMW15410Sound Barrier Patch Copyright 2012 General Motors Company All Rights ReservedNovember 2012 Originating Department: North American Engineering Standards Page 1 of 41 Scope1.1 Material Description. This specification describes an adhesively a
2、ttached sheet-form sound barriermaterial used to cover and acoustically seal body interior holes to prevent noise intrusion.1.2 Symbols. Not applicable.1.3 Typical Applications. This material is a dense, flexible impermeable sheet of uniform thickness. It is eitherself-adhering or coated with a pres
3、sure sensitive adhesive to provide permanent attachment to painted bodyinterior panels. It is used to cover and acoustically seal body holes. This is a trim shop installed item and is notintended for installation prior to paint bake operations.There are two material types with different applications
4、 as follows:x Type I: To be used on horizontal surfaces.x Type II: To be used on vertical and overhead surfaces.1.3.1 The acoustical performance of parts made of this material depends upon the materials surface density(mass/area), impermeability, and completeness of the seal over the body hole.1.3.2
5、 The material is provided in various drawing-specified part sizes with the adhesive surface protected by arelease liner.2 ReferencesNote: Only the latest approved standards are applicable unless otherwise specified.2.1 External Standards/Specifications.FMVSS 302 ISO 8067 ISO 8510 ISO 8510-12.2 GM St
6、andards/Specifications.GMW3002 GMW3016 GMW3205 GMW3235GMW3005 GMW3059 GMW3221 GMW14124GMW3008 GMW31542.3 Additional References.TMC003 Material Safety Data Sheet guidance documents (available at ).3 Requirements3.1 Requirements on Samples. All samples are to be conditioned prior to each requirement t
7、est toGMW3221, Code A.3.2 The values of some properties and performance parameters (e.g., tensile strength, tear strength) maydepend upon direction along the material sample. Therefore, it may be necessary to perform some tests bothparallel and perpendicular to machine direction in order to determin
8、e true minimum and maximum values forconformance to requirements of this specification.3.3 Acoustical Performance. The noise reduction performance of this sound barrier material is defined andcontrolled by material mass per unit area. The mass per unit area will be 3.2 kg/m2 with tolerances as defin
9、edin Table 1.Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW15410 Copyright 2012 General Motors Company All Rights ReservedNovember 2012
10、 Page 2 of 4Table 1: TolerancesPart Weight (g) Tolerance in Mass/Area0 to 60 +50%/-10%61 to 199 +20%/-10%200 to over +10%/-10%3.4 Color. The barrier material shall be black. Any anti-blocking, anti-transfer film which is permanentlyattached to the barrier materials shall also be black or clear.3.5 A
11、dhesion. Adhesion tests shall be completed on approved paint system as specified by GM MaterialsEngineering. All tests shall be done with at least a set of five test samples.3.5.1 Adhesive Contact (Wet-out). Progressively apply a patch, 50 mm x 100 mm minimum to a clear glassplate taking care to avo
12、id air entrapment. Roll twice with a 2 kg roller. Examine adhesive contact. Wet-out mustbe 90% minimum.3.5.2 Peel Resistance (ISO 8510-1). Prepare test samples in this section as described in ISO 8510-1. Leaveone end loose so that a clamp can be attached. Allow a 5 minute dwell time. Cross-head spee
13、d should be setat 300 mm/minute. Satisfactory peel values for both Types I and II are as follows:x Type I 20 N minimumx Type II 30 N minimum3.5.3 Heat Resistance, 85 C. Adhere a 25 mm x 100 mm strip of material to a painted test panel (as in 3.5.2)with 50 mm of strip overhanging the edge of the test
14、 panel. Place test panel in inverted horizontal position(90 degree peel) in oven and expose to 85 C for 24 h. Maximum distance from edge of panel to bond line is5 mm.3.5.4 Heat Resistance, 100 C. Adhere a 50 mm x 50 mm piece of material to a painted test panel (as in3.5.2) so that the entire patch s
15、urface is in contact with the panel. Place test panel in vertical position in ovenand expose to 100 C for 24 h. No displacement of the patch may occur.3.5.5 Paint Adhesion Tests for Production. Adhesion tests to the painted substrate shall be completed withapproved paint materials and layering. Typi
16、cally, full paint film build layering is not present on interior surfaces.x Testing should be performed with approved patch material.- Directly to plant specific or regional preferred, baked electrocoat (GMW3008) at target film build of20 m to 25 m only.x Optional requirements per responsible GM eng
17、ineer.- Directly to plant specific or regional preferred, baked primer surfacer (GMW3002) over specifiedelectrocoat, in a wedge from 0.0 m to 20 m film build.- Directly to plant specific or regional preferred, baked basecoat and clearcoat (GMW3005) overspecified electrocoat, in a reverse wedge (see
18、GMW3005, Figure 4) with basecoat from 0.0 m to12.5 m and clearcoat from 0.0 m to 20 m film build.x All tests shall be done with a minimum of five test samples.x GMW3008 approved, electrocoated panels, as supplied through ACT Industries are permissible.3.6. Environmental Exposure (GMW14124, Cycle H).
19、 Adhere 25 mm x 100 mm or larger sample to paintedtest panel (as in 3.5.2). Expose to three cycles of GMW14124, Cycle H. The material must not hardenappreciably nor leach oils. Adhesion after exposure must meet requirements of 3.5.2.3.7 Flammability (FMVSS 302). The material with release liner remov
20、ed (but not bonded to a test panel) shallnot burn or transmit a flame as-received and after accelerated aging (GMW14124, Cycle T). However, if thematerial stops burning before it has burned for 60 s from the start of timing and has not burned more than50.8 mm from the point where the timing was star
21、ted, it shall be considered as having met this requirement.3.8 Stiffness/Conformability/Memory. Apply a 25 mm x 100 mm strip of material to a horizontal surface sothat a 25 mm x 50 mm portion overhangs the edge. Deflect the overhung portion downward to a verticalposition and immediately release it.
22、Allow 4 h to elapse and measure the vertical distance from original surfaceto the overhung end of the strip. The sag shall be 25 mm minimum.Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license
23、from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW15410 Copyright 2012 General Motors Company All Rights ReservedNovember 2012 Page 3 of 43.9 Cold Mandrel-Bend-Test (GMW3154). Wrap a 50 mm x 100 mm strip of the patch material 180 degreesaround a 70 mm diameter mandrel, per GMW3154, so that adhesive
24、 surfaces meet. The strip of patch materialmust not crack.3.10 Repositionability. Material applied to a test panel for one minute must release cleanly for repositioningand then be capable of re-adhesion per specification requirements.3.11 Die Cut Ability. Material must be capable of being cleanly di
25、e cut to special shapes.3.12 Non-transfer and Staining. Adhere a patch to a metal test panel. Cover with lightest color of currentlyavailable production seat belt webbing so that entire patch and its edges are covered by the belt material.More than one strip of webbing may be required. Completely co
26、ver the webbing with another metal panel andapply a load of 7 kPa based upon the area of the patch.3.12.1 Place the assembly in an 85 C oven for 24 h. After cooling to room temperature, remove the weightand metal cover plate.3.12.2 Remove the webbing from the noise control patch. The webbing must se
27、parate cleanly from the patch.No significant staining or transfer of patch material to the webbing is permitted.3.13 Solids Content (GMW3016). The solids content shall be 98% minimum by weight.3.14 Tear Strength (ISO 8067). The tear strength shall be 1.7 kN/m minimum.3.15 Odor (GMW3205). The materia
28、l must have an individual odor scale rating number of 6 or better whentested per GMW3205.3.16 Fogging GMW3235, Volatility of Organic Constituents. (GMW3235, Method B).3.16.1 Gravimetric Procedure. Bath temperature to be set at T2, cooling temperature of 21 C, 18 h test time,24 h post-conditioning ti
29、me. The amount of fog, when weighed, shall be 1.0 mg. Samples that result in aresidue that forms a transparent film, discernible droplets (0.05 mm in diameter), or any visual signs ofcrystallinity, when viewed at 40x magnification shall be judged to have not passed this requirement. Provide a40x mag
30、nified picture of each fog plate with the results.3.17 Release Liner Removal. The release liner paper or film must be readily removed from the sealer withouttearing or delamination of the part or release liner. Removal must be accomplished with a force not to exceed4 N per 100 mm width.3.18 Blocking
31、. A stack of ten patches is heated in an oven at 60 C for 72 h while under a uniformly appliedload of 7 kPa. The test samples are removed from the oven, allowed to cool to room temperature, and theweight removed. The samples shall be easily separated and shall not stretch, lose shape, or stick to ea
32、chother when pulled apart. Parts may not be dusted with talc or any other material in order to meet thisrequirement.3.19 Storage Stability. The shelf life of the material shall be 180 days at a temperature not to exceed 35 C.Shelf life of material commences upon receipt of material from the manufact
33、urer. Material must meet allperformance requirements after storage and no blocking may occur.4 Manufacturing ProcessNot applicable.5 Rules and Regulations5.1 Legal Regulations. All materials must satisfy applicable laws, rules, regulations and recommendationsvalid in the country of usage.5.2 Languag
34、e. In the event of conflict between the English and domestic language, the English language shalltake precedence.5.3 Inspection and Rejection. Samples of components or materials released to a GM material specificationshall be tested for conformity with the requirements of this material specification
35、 and approved by theresponsible Engineering department prior to commencement of delivery of bulk supplies.A new approval must be received for any changes, e.g., properties, manufacturing process, location ofmanufacture, etc. If not otherwise agreed, all testing and documentation normally required fo
36、r initial releasemust be completed.Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW15410 Copyright 2012 General Motors Company All Rights
37、 ReservedNovember 2012 Page 4 of 4It is the responsibility of the supplier to inform the customer in a timely manner, without solicitation, and toinclude documentation of all modifications of materials and/or processes and to apply for a new release.If not otherwise agreed, all release tests shall b
38、e repeated and documented by the supplier prior tocommencement of delivery of non-conforming bulk supplies. In individual cases, a shorter test can be agreedto between the responsible Engineering department and the supplier.5.4 Material Safety Data Sheets/Safety Data Sheets (MSDS/SDS). For new produ
39、ct submissions, or when achange in chemical composition of an existing product has occurred, a complete copy of the Material SafetyData Sheet/Safety Data Sheet must be submitted in compliance with the Globally Harmonized System ofClassification and Labeling of Chemicals (GHS) requirements or other c
40、ountry-specific MSDS/SDSrequirements. In addition, product MSDS/SDS submissions must be in compliance with specific countryGeneral Motors TMC003 Material Safety Data Sheet/Safety Data Sheet guidance documents where available.5.5 All materials supplied to this standard must comply with the requiremen
41、ts of GMW3059, Restricted andReportable Substances for Parts.6 Approved SourcesMaterials supplied to this specification must be approved by General Motors.A list of approved materials can be found in MATSPC. This GM Material File is provided to third parties toreduce redundant testing of materials.
42、If approved material already listed is used, the part supplier can use GMMaterial File reference for Production Part Approval Process (PPAP) material approval. If the decision is madeto use a not yet approved material, contact the Textiles & Trim Materials group for detail on the approvalprocess. Th
43、e material approval process must be completed prior to PPAP start date of the part supplied toGeneral Motors.7 Notes7.1 Glossary.MATSPC: Global repository of GM approved materials for corresponding GM Engineering Standards.7.2 Acronyms, Abbreviations, and Symbols.GHS Globally Harmonized System of Cl
44、assification and Labeling of ChemicalsMSDS Material Safety Data SheetPPAP Product Part Approval ProcessSDS Safety Data Sheet8 Coding SystemThis standard shall be referenced in other documents, drawings, etc., as follows:Material per GMW15410 Type X, where X indicates type per paragraph 1.2.9 Release
45、 and RevisionsThis standard was originated in August 2006. It was first approved by the Global Materials Group in November2007. It was first published in December 2007.Issue Publication Date Description (Organization)1 DEC 2007 Initial publication.2 FEB 2008 Corrected the headers to reflect GMW15410
46、. (Global Materials Group)3 JUL 2012 Updated content. (Textiles & Trim Materials Global Subsystem LeadershipTeam)4 NOV 2012 Revised paragraphs 3.5 and 3.16. Added paragraph 3.5.5. (Textiles & TrimMaterials 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-,-,-
