1、 WORLDWIDE ENGINEERING STANDARDS Test Procedure GMW3368 Quick Knife Adhesion Test for Stationary Glass Bonding Materials Copyright 2011 General Motors Company All Rights Reserved June 2011 Originating Department: North American Engineering Standards Page 1 of 5 1 Scope This standard describes a test
2、 procedure to determine the compatibility of stationary glass adhesive to paint systems. Note: Nothing in this standard supercedes applicable laws and regulations. Note: In the event of conflict between the English and domestic language, the English language shall take precedence. 1.1 Purpose. Not a
3、pplicable. 1.2 Foreword. Not applicable. 1.3 Applicability. Not applicable. 2 References Note: Only the latest approved standards are applicable unless otherwise specified. 2.1 External Standards/Specifications. None 2.2 GM Standards/Specifications. GMW3041 GMW3221 3 Resources 3.1 Facilities. Not ap
4、plicable. 3.2 Equipment. 3.2.1 Quantity of 100 300 mm painted panels baked in gas fired oven unless otherwise specified. 3.2.2 Paintbrush or dabber applicator for priming. 3.2.3 Razor knife. 3.2.4 Air operated or electric cartridge dispense gun. 3.2.5 Metric linear measure device capable of measurin
5、g to the nearest mm. 3.2.6 Clamps, clamping devise for securing test panels. 3.3 Test Vehicle/Test Piece. 3.3.1 Test Material. 3.3.1.1 Appropriate pinchweld primer as needed. 3.3.1.2 Appropriate glass primer systems as needed. 3.3.1.3 Appropriate stationary glass bonding adhesive. 3.4 Test Time. Not
6、 applicable. Calendar time: Days Test hours: hours Coordination hours: hours 3.5 Test Required Information. Not applicable. 3.6 Personnel/Skills. Not applicable. Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking perm
7、itted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW3368 Copyright 2011 General Motors Company All Rights Reserved June 2011 Page 2 of 5 4 Procedure Summary of Test Method. This test procedure is to be used to prepare painted metal and glass samples to determine the failure mode
8、 of the stationary glass adhesive sealing compound. Standard Conditions. All testing in standard conditions to this standard shall be performed in accordance with GMW3221 Code A, Procedure for Standard Conditions of Organic Materials. 4.1 Preparation. 4.1.1 Test Sample Preparation. 4.1.1.1 Test Pane
9、l Aging. 4.1.1.1.1 Painted Panels. Unless otherwise specified, age painted test panels maximum 8 hours at 22 3 C and 50 5% maximum relative humidity (RH) prior to primer and/or adhesive application. Record the actual temperature and relative humidity. 4.1.1.2 Primers Application. 4.1.1.2.1 As applic
10、able, apply primer/s to the location of the painted panel or glass sample with 25 mm wide films in necessary lengths. Follow manufacturers procedures and recommendations for primer flash, cure and dry film thickness. Note: Primers for adhesive testing will be used as required and approved by the res
11、ponsible GM Engineering Group. 4.1.1.2.2 Unless otherwise specified, air dry primed panels for 30 minutes at 22 3C and 50 5% maximum relative humidity (RH). Record the actual temperature and relative humidity. 4.1.1.3 Adhesive Application. 4.1.1.3.1 Bead Size. Adhesive bead cross sections may range
12、from 6 6 to 10 10 mm2 of the appropriate stationary glass bonding adhesive. 4.1.1.3.2 Standard Quick Knife Adhesion (QKA) Length, Painted 100 x 300 mm panels. Unless otherwise specified, apply 200 mm minimum length adhesive beads, evenly spaced apart, parallel to the 300 mm length of the painted pan
13、el. 4.1.1.3.3 Cold Cure for QKA, Painted 100 x 300 mm panels. Apply five evenly spaced adhesive beads to the painted panel parallel to the 300 mm length. 4.1.1.3.4 Glass or other substrates. When glass or other substrates are used for QKA testing, refer to the appropriate GM Engineering Group for ag
14、reement of substrate size and bead lengths to be used. 4.1.1.3.5 Aging. Unless otherwise specified, age the prepared samples (with adhesive) for 4 hours at 22 3 C and 50 5% maximum RH prior exposure to additional environmental conditions. Record the actual temperature and relative humidity. 4.1.1.4
15、Cure Conditions. Unless otherwise specified, allow the prepared test samples to cure for the durations and environments as indicated in the appropriate specifications (GMW3041). Record the actual temperature and relative humidity. 4.2 Conditions. 4.2.1 Environmental Conditions. 4.2.2 Test Conditions
16、. Deviations from the requirements of this standard shall have been agreed upon. Such requirements shall be specified on component drawings, test certificates, reports, etc. 4.3 Instructions. 4.3.1 Test Procedure. 4.3.1.1 Recovery for Exposures Other Than Cold Cure. After environments, allow the cou
17、pons 12 to 24 hours recovery time at room temperature lab conditions prior to Quick Knife Adhesion testing. 4.3.1.2 Cold Cure Recovery. After cold cure exposure, allow the coupons to recovery a maximum of 1 hour at room temperature lab conditions prior to Quick Knife Adhesion testing. 4.3.1.3 Starti
18、ng at one end of the adhesive bead, cut the cured urethane as close as possible to the bonded substrate 20 to 25 mm long. Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WO
19、RLDWIDE ENGINEERING STANDARDS GMW3368 Copyright 2011 General Motors Company All Rights Reserved June 2011 Page 3 of 5 4.3.1.4 Peel back the cut end of the urethane to an approximately 150 degree angle while cutting through the bonded adhesive into the paint layering or other test substrate. The knif
20、e blade should be as close to perpendicular to the panel surface as possible. Perform subsequent cuts on each sample with the distance between cuts approximately 12 mm for a minimum of 75% of the bead. See Figure A1. 4.3.1.5 Examine the surface of the panel under the cured urethane. Record the separ
21、ation mode of the adhesive from the painted panel or other test substrate (i.e., cohesive separation of the adhesive, adhesive separation of the adhesive to the pinchweld primer, adhesive separation of the pinchweld primer to the painted panel, adhesive or cohesive separation of the various paint la
22、yers, etc). Identify both the separation mode and the paint layers that separated. Use the separation mode classifications below to record the separation modes and substrates in the appropriate test report. 5 Data 5.1 Calculations. Not applicable. 5.2 Interpretation of Results. Not applicable. 5.3 T
23、est Documentation. 5.3.1 Evaluation and Rating. 5.3.1.1 Separation mode classifications. CF cohesive separation of the adhesive AF adhesive separation of the adhesive from the interface surface/substrate BC basecoat BP body side adhesive primer CC clearcoat CONT continuous EC electrodeposition coati
24、ng, ELPO, e-coat G glass GP glass adhesive primer P/S primer surfacer Identify other substrate materials as appropriate (e.g., structural reaction injection molding (SRIM), sheet-molded composite, (SMC), acrylonitrile butadiene styrene (ABS), etc.) 5.3.1.2 Measure the distance of layering separation
25、 from the cut line to the end of the separation (furthest point). Record the measurement in mm and report the percentage and separation mode. e.g., 80%CF/20%AF, 70%CF/20%AF/10%CF-SMC, 50%CF/50%CF-CC. Continuous adhesive separation without recovery between the cuts shall be specifically noted, e.g.,
26、30%CF/70%AF -CONT. 5.3.2 Report. Report the following. 5.3.2.1 Material identification to include any adhesive, primers, coatings or other substrates. 5.3.2.2 Test material source, product and batch identification. 5.3.2.3 Cure temperatures, relative humidity and durations. 5.3.2.4 Layering separati
27、on distance. 5.3.2.5 Cumulative measurements of all successive cuts in terms of percentage and modes of separation totaling 100%. Continuous adhesive separation without recovery between the cuts shall be specifically noted. 6 Safety This standard may involve hazardous materials, operations, and equi
28、pment. 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 safety and health practices and determine the applicability of regulatory limitations prior to use. Copyright General Motor
29、s Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW3368 Copyright 2011 General Motors Company All Rights Reserved June 2011 Page 4 of 5 7 Notes 7.1 Glossary. Not a
30、pplicable. 7.2 Acronyms, Abbreviations, and Symbols. ABS Acrylonitrile Butadiene Styrene QKA Quick Knife Adhesion RH Relative Humidity SMC Sheet-molded Composite SRIM Structural Reaction Injection Molding 8 Coding System This standard shall be referenced in other documents, drawings, etc., as follow
31、s: Test to GMW3368 9 Release and Revisions This standard was originated in January 2000. It was first approved by GM Global Glass Bonding Adhesive and Sealer Technology Development Group (TDG) in May 2006. It was first published in May 2006. Issue Publication Date Description (Organization) 1 MAY 20
32、06 Initial Publication. 2 June 2011 Five Year Refresh (Global Adhesives Team) 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 GMW3368 Copyright 2011 General Motors Company All Rights Reserved June 2011 Page 5 of 5 Appendix A Figure A1: Quick Knife Adhesion Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
