1、WORLDWIDEENGINEERINGSTANDARDSMaterial Specification GMW15671Performance Requirements of Bonded Exterior Trim Copyright 2013 General Motors Company All Rights ReservedJune 2013 Page 1 of 71 Scope1.1 Material Description. This specification defines the adhesion requirements of exterior trim that is ta
2、peattached to painted or non-painted substrates. These requirements also include weatherstrips and seals thatare tape attached, and flexible or metallic inserts tape attached, and used as a decorative component of amolding, applique, fascia, or sill plate assembly. The adhesive system is typically a
3、 double-coated foam, orelastomeric tape.1.1.1 This specification covers the laboratory test requirements for Production Part Approval Process (PPAP)(Table A1, Appendix A), and Routine Quality Control (Table A2, Appendix A).1.1.2 In addition to the tape/substrate combinations, approvals are also spec
4、ific to the facility that laminates thetape to the part.1.2 Symbols. Not applicable.1.3 Typical Applications. This specification applies only to substrates, paint, adhesion promoters, and tapematerials that have been qualified and approved to the appropriate GM specifications.1.3.1 Double-coated foa
5、m or elastomeric tapes shall meet the requirements of GMW15201 for the appropriatetape type. Tape approvals to GMW15201 include adhesion testing to exterior topcoats.1.3.2 The process and requirements for obtaining GM Approval for Approved Adhesive Applications (AAA) hasbeen removed from this specif
6、ication. If it is required, GMW15625 will be added to the part drawing, or mathdata.2 ReferencesNote: Only the latest approved standards are applicable unless otherwise specified.2.1 External Standards/Specifications.ISO 8510-1 ISO/IEC 17025 SAE J2215 TS 169492.2 GM Standards/Specifications.9985568
7、GMW3116 GMW14729 GMW168309985630 GMW3221 GMW152019986084 GMW14124 GMW15625GMW3059 GMW14333 GMW167662.3 Additional References.x GM General Procedure GP-10x TMC003 Material Safety Data Sheet guidance documents (available at )3 Requirements3.1 Requirements on Test Specimens. All tests shall be performe
8、d at conditions per GMW3221 Code Aunless otherwise specified.3.1.1 Sample Preparation. The bonded part must be conditioned for 72 h per GMW3221 Code A prior toenvironmental exposure unless otherwise stated. Flexible, or metallic tape attached inserts must be bondedusing production intent, or represe
9、ntative locating and wet-out techniques. Production intent adhesionpromoters must be used. Wet-out target is 80% minimum. Samples shall be conditioned 1 h perGMW3221 Code A following environmental exposure prior to testing unless otherwise specified.Copyright General Motors Company Provided by IHS u
10、nder license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW15671 Copyright 2013 General Motors Company All Rights ReservedJune 2013 Page 2 of 73.2 Test Preparation and Evaluation.3.2.1 Facilities.3.
11、2.1.1 For PPAP Testing, if tests are performed outside of GM, use a laboratory from an organization that iseither third (3rd) party registered to TS 16949 or has laboratory accreditations to ISO/IEC 17025 or to GMGeneral Procedure GP-10.3.2.1.2 All testing is the responsibility of the GM supplier wh
12、o laminates tape to the parts in question.3.2.2 Component Testing.3.2.2.1 For parts that are directly tape attached to the vehicle exterior, on either painted, or non-paintedsubstrates, test using the aluminum foil 90 degree peel strength test procedure detailed in GMW16830. Testafter the environmen
13、ts listed in 3.3. Tape to part bond performance is evaluated using the aluminum foil peel90degree peel strength test.3.2.2.2 For flexible or metallic inserts tape attached to a molding, appliqus, fascia, or sill plate, run the90degree peel strength test per ISO 8510-1, and use a rate of grip separat
14、ion of 300 mm per minute. Recordthe average 90 degree peel strength and the failure mode (i.e., adhesive failure, cohesive failure, or adherendfailure) after the environments listed in 3.3. Tape to insert, and tape to component bond performance isevaluated using the 90 degree peel test.3.2.2.3 All s
15、pecimens for testing must be obtained from parts that have been molded, painted and processedusing the same equipment, tools, materials, processing conditions and manufacturing locations that will beused to manufacture production parts for vehicle assembly. If regrind is allowed, all specimens for t
16、esting mustbe obtained from production parts that are made from the maximum allowable regrind as stated on thedrawing.3.2.2.4 Each test must be completed on a minimum of three (3) samples, each obtained from separate parts.3.3 Ninety Degree (90) Peel Strength. The minimum average 90degree peel stren
17、gth test value can befound in GMW15201, Performance Requirements Tables, in the column for the appropriate tape type after thefollowing environmental exposures:x 20 minutes at 23 C 2 C and 50% 5% Relative Humidity (RH) GMW15201, PerformanceRequirements Tables, row “20 Minute Peel”.x 72 h at 23 C 2 C
18、 and 50% 5% RH per GMW15201, Performance Requirements Tables, row “72 hPeel”.x 168 h in an air circulating oven at 70 C per GMW15201, Performance Requirements Tables, row“Accelerated Age”.x 168 h in a condensing humidity chamber per GMW14729 and GMW15201, Performance RequirementsTables, row “Humidit
19、y”.x 2 cycles of GMW14124 Cycle C per GMW15201, Performance Requirements Tables, row “Cycle Test”. Anoptional cycle test is the adhesive/sealant humidity/high temperature cycle per GMW14124 Test Cycle“W”, five (5) cycles, if specified on the drawing.For example, the minimum average 90 degree peel st
20、rength test for Type IXA tape would be:x 20 minute peel 32 Nx 72 h peel 50 Nx Accelerated Age 48 Nx Humidity 38 Nx Cycle Test 46 N3.3.1 The typical failure mode observed during the 90 degree peel strength test after accelerated aging, andthe environmental cycle test is cohesive failure (foam split).
21、 Mixed failure modes are frequently observed(cohesive failure and adhesive failure). Certain substrates, and tapes will not exhibit cohesive failure, and notall applications will require cohesive failure. The Release Engineer and the Material Engineer should specifyrequirements for the application.3
22、.3.2 Test the actual part or sections cut from the part. The length of the test specimen shall be 150 mmminimum. Disregard the first and last inch of peel. Report the average peel strength, and the failure mode. Allminimum peel values in GMW15201 are based on a 12.7 mm tape width. For tape widths ot
23、her than 12.7 mm,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 GMW15671 Copyright 2013 General Motors Company All Rights ReservedJune 2013
24、 Page 3 of 7the peel strength requirement is directly proportional to the width. For moldings with ribs, do not count thevoids between the ribs when determining the actual tape width.3.3.3 Adhesion promoter selection for lift gate, and Center High Mounted Stop Lamp (CHMSL) appliques madefrom Acrylon
25、itrile Butadiene Styrene (ABS) or Acrylonitrile Butadiene Styrene/Polycarbonate (ABS/PC)plastics.3.3.3.1 Clean plastic test strip with 1:1 distilled water/isopropyl alcohol. Wipe dry using a lint free clean cloth.3.3.3.2 Apply adhesion promoter (9985568 or 9985630). Allow to air dry, approximately 6
26、0 s.3.3.3.3 Laminate production intent double-coated foam tape (non-liner side) to test strip.3.3.3.4 Roll one (1) time with a 6.8 kg roller at a rate of approximately 30 cm/minute.3.3.3.5 Clean production intent substrate test plaque (painted steel or glass) with 1:1 distilled water/isopropylalcoho
27、l. Wipe dry using a lint free clean cloth.3.3.3.6 Apply adhesion promoter to glass (9986084 or equivalent). Allow to air dry, approximately 60 s.3.3.3.7 Remove tape liner and apply plastic test strip with tape to substrate.3.3.3.8 Roll two (2) times, back and forth, with a 6.8 kg roller at a rate of
28、 approximately 30 cm/minute.3.3.3.9 Dwell for 4 h at room temperature.3.3.3.10 Heat sample in an air circulating oven for 1 h at 80 C.3.3.3.11 Remove sample from oven, and immediately run a 90 degree peel strength test at 300 mm/minute jawseparation, measuring breakaway and continuous peel strength.
29、3.3.3.12 The failure mode during the peel strength test must be cohesive (foam split). If the failure mode isadhesive (clean separation between the tape and the plastic), then try the other adhesion promoter.3.4 Fuel Resistance (only applicable for trim located below the fuel filler). Use one of the
30、 reference fuelsin GMW14333. Immerse samples 25 times, 10 s immersion with a 20 s dry-off in between. During dry-off, drainall fuel from panel. Allow sample to dwell 24 h at ambient prior to running the 90 degree free peel strength test,30 N minimum average peel strength requirements for 12.7 mm tap
31、e width.3.5 Free State (unbonded) part check at temperature for tape attached components. Expose entire part,by placing on a flat surface with release liner on, at room temperature, and after the following conditions:x 4 h at 80 C. Check at temperature for excessive shrinkage, warping, curling, etc.
32、x 4 h at -30 C. Check at temperature for excessive shrinkage, warping, curling, etc.3.5.1 Record any change from nominal in millimeters (mm). Production parts should have 1 mm gap, maximum 13 N to net thepart end to sheet metal.XAdhesion PromoterSelection for ABS, orABS/PC PartsGMW15671 Cohesive Fai
33、lure XFuel Resistance forTrim Located Under theFuel FillerGMW14333Method C Note 230 N minimum average 90 degree PeelRequirement for 12.7 mm tape widthXNote 1: Test a minimum of three (3) parts, or sections of parts. For peel tests, report average peel strength, and failure mode.Note 2: Immerse sampl
34、es 25 times, 10 s immersions with a 20 s dry off in between. During dry off, drain all fuel from panel. Allow sampleto dwell 24 h at ambient prior to running the 90 degree peel strength test.RT = Room temperatureCopyright General Motors Company Provided by IHS under license with General Motors Compa
35、nyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW15671 Copyright 2013 General Motors Company All Rights ReservedJune 2013 Page 7 of 7Table A2: Daily Quality Control TestingTest Class GMSpecification Requirements Daily Testing9
36、0Degree AveragePeel Strength ofAluminum Foil to partwith tapeGMW16830 Record average peel strength, and failure mode.Establish minimum peel strength, andpercent (%) cohesive failure for specific partdesign, and process.XTape to Part Wet-Out GMW16766 100% Minimum Wet-Out. If less than 100%attach an explanation.XCopyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
