1、 WORLDWIDE ENGINEERING STANDARDS Material Specification GMW16569 Paint/Glass Bonding Compatibility Copyright 2011 General Motors Company All Rights Reserved September 2011 Originating Department: North American Engineering Standards Page 1 of 11 1 Scope This specification covers the testing requirem
2、ents for determining the compatibility of paint materials and processing with approved glass bonding materials. These requirements cover initial qualification and testing of variances in the paint layers, paint processing or stationary glass bonding systems. 1.1 Material Description. Not applicable.
3、 1.2 Symbols. Not applicable. 1.3 Typical Applications. Not applicable. 1.4 Remarks. 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. 9981062 GMW3059 GMW3371 9
4、982075 GMW3221 GMW14729 GMW3041 GMW3368 GMW16568 2.3 Additional References. TMC003 Material Safety Data Sheet guidance documents (available at ). 3 Requirements 3.1 Requirements on Test Specimens. Reference GMW3221. 3.1.1 Test Authorization and Reporting Requirements. 3.1.1.1 GM Test Identification
5、Number. At the time of test initiation, the appropriate GM engineering group must issue a material test request. The associated number is to be used to track the status of the testing as well as for documentation and record keeping purposes. A cover sheet will be developed defining the general mater
6、ials, requirements and test purpose. See Appendix B for an example of the cover sheet. 3.1.1.2 The appropriate GM Engineer must complete “Test Initiation Report Form Number 1”. The appropriate testing category will be indicated, which in turn will define testing requirements per Table A1. Temperatur
7、es shown in Table A1 are in degrees Celsius. See Appendix C at the end of this requirement for an example of the Test Initiation Form Number 1. 3.1.1.3 The appropriate GM Engineer must complete the following categories per “Test Initiation Report Form Number 2” for all layers: 998XXXX, supplier, sup
8、plier code, paint code WA numbers and required bake schedules. The GM Engineer must indicate specific bake times and temperatures when necessary. The supplier must submit the following information per Report Form Number 2 with the test report: actual bake schedules, material batch numbers and actual
9、 film builds. An authorized supplier representative must sign-off that the work has been done in accordance with this specification. See Appendix D at the end of this requirement for an example of the Test Initiation Report Form Number 2. 3.1.1.4 The supplier must review test data with appropriate G
10、M engineering group. Test data and samples must be accompanied by the Test Work Order (TWO) cover sheet at time of review. All test data must be Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without lic
11、ense from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW16569 Copyright 2011 General Motors Company All Rights Reserved September 2011 Page 2 of 11 reported in a format approved by GM Paint and Polymers Center. The approving engineer will sign off that the results were reviewed and whether or not re
12、quirements were met. 3.2 Test Materials and Processing. 3.2.1 Test Panels. Test panel substrates such as glass, plastic and coated metal must be approved by the appropriate GM engineering group prior to test. Base metal coated substrate must be phosphated, cold rolled or electro galvanized steel min
13、imum. 3.2.2 Paint Materials. For all paint materials used, production representative batches must be used. For application of these materials (i.e., nominal film build) refer to the appropriate material specifications. The following information relating to each paint material used for each layer mus
14、t be stated in the final test report: x Layer type (i.e., Electro-deposition (ELPO), topcoat, etc.) x GM specification number: e.g., 998XXXX, L000 XXX XXX, 947XXXXXX x Supplier x Supplier product code (product name) x Batch (Lot) number x Dry film build thickness 3.2.3 Paint Processing (Bake Schedul
15、e). The bake schedule for the test layer is outlined in Table A1 of this specification. Except where indicated, use the target bake schedule as stated in the appropriate material specification for all non-test layers. All bake schedules are specified as metal temperature. Use thermocouples to verify
16、 bake schedules. If the bake schedule is different than outlined in Table A1 of this specification, the actual bake schedule must be documented in writing and verified by the appropriate GM engineering group. 3.2.4 Glass Bonding Materials. For testing of variances in the paint layers or processing,
17、specify the appropriate urethane pinchweld primer and/or adhesive system. The target facility paint material will always be used as the default for glass adhesive system selection. Before initiating testing, verify the use of glass bonding materials with the appropriate GM engineering group. For app
18、lication of glass bonding materials, refer to the appropriate material specifications. The following information for each glass bonding component must be stated in the final test report: x Glass bonding material description (pinchweld primer and/or adhesive) x GM specification number: e.g., 998XXXX,
19、 L000 XXX XXX, 947XXXXX x Supplier x Supplier code (product name) x Batch (Lot) number 3.2.5 Glass Bonding Material Processing. Apply the pinch-weld primer and/or urethane adhesive, as required, per the appropriate GM specification or per the material manufacturers requirements. Note: For topcoat qu
20、alification, maximum aging after bake and prior to pinchweld prime application is 1 hour. Unless otherwise specified, glass bonding adhesive systems must be applied within 8 hours of paint application and bake. 3.3 Test Categorization. The following test requirement descriptions defined in Table A1
21、are specific to the type of submission category for required paint and glass bonding material changes. Details of individual tests required are defined in 3.4 of this standard. Note: All technologies referenced below are designated by a GM specification number, Hazardous Materials Control System Ide
22、ntification (HMCS ID) number and Material Safety Data Sheet. Any modification to an existing technology must be approved by the appropriate GM engineering group with a written description of the modification. 3.3.1 Row A. Qualification of new or licensed monocoat, basecoat and/or clearcoat technolog
23、y. All new monocoat, basecoat and/or clearcoat technologies must be qualified for use with approved glass bonding materials per GMW3041, Approval and Compatibility using Quick Knife Adhesion (QKA) (see GMW3368) and Overlap Shear (OLS) (see GMW3371) testing. Run Cold Cure QKA for the four standard co
24、lors in under and over bake conditions. Perform the required tests outlined in Table A1, Row A, of this specification. Row H and Row J should be run concurrently. Row L should be run upon material introduction to an assembly plant. Copyright General Motors Company Provided by IHS under license with
25、General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW16569 Copyright 2011 General Motors Company All Rights Reserved September 2011 Page 3 of 11 3.3.2 Row B. Qualification of a modification to an existing monoc
26、oat or clearcoat technology. Based on the modification significance, it is the decision of the appropriate GM engineering group as to the required testing; Table A1, Row A or Row B. 3.3.3 Row C. Qualification of a modification to an existing basecoat. Perform the required tests as outlined in Table
27、A1, Row C. 3.3.4 Row D. Qualification of new/licensed ELPO, primer surfacer (color keyed or color specific) or seal coat technology used as a bonding surface. Perform the required tests as outlined in Table A1, Row D. For color specific primer surfaces, Table A1, Row H should be run concurrently for
28、 additional colors. Row L should be run upon material introduction to an assembly plant. 3.3.4.1 Approved masking tape should be used per Row J to evaluate Quick Knife Adhesion before and after humidity. If no plant-designated tape is specified for technology qualification, use American Tape PG 21.
29、3.3.5 Row E. Qualification of a modification to an existing ELPO, primer surfacer (color keyed or color specific) or seal coat technology used as a bonding surface. It is the decision of the appropriate GM engineering group as to the required testing; Table A1, Row D or Row E. For color specific pri
30、mer surfacers, Table A1, Row H should be run concurrently for additional colors. Row L should be run upon material introduction to an assembly plant. 3.3.6 Row F. Qualification of a glass bonding adhesive sealing system. Perform the required tests as outlined in Table A1, Row F. Under and over bake
31、conditions will be run for Cold Cure QKA as specified. Row H should be run concurrently for additional colors. Row L should be run prior to and during material introduction to an assembly plant. Note: This is a Materials Engineering responsible function. 3.3.7 Row G. Qualification of paint layering.
32、 Each paint layering system must be approved before it is used in production. Each layer may have been approved independently with other layers, but the exact combination of products was not tested as a layering system. If all layers have been previously approved according to this specification, per
33、form the required tests as outlined in Table A1, Row G, of this specification for the new layering combination. Row H should be run concurrently for additional colors of basecoat and clearcoat changes. Row L should be run upon material introduction to an assembly plant. 3.3.8 Row H. Qualification of
34、 new topcoat or primer colors (annual programs). Each topcoat color or primer surfacer used as a bond surface must be qualified for use with the glass bonding materials (urethane adhesive and/or primer) released for production. Each topcoat color or primer surfacer used as a bond surface must be tes
35、ted over a current production ELPO. Follow the bake schedule and other requirements outlined in Table A1, Row H, of this specification. 3.3.9 Row I. Qualification of approved pinchweld primers. Each previously approved pinchweld primer must be qualified for use with the specific plant paint system r
36、eleased for production (including topcoat, primer surfacer and ELPO). 3.3.9.1 Topcoats. Perform bakes and other tests for qualification of a pinchweld primer with topcoat as outlined in Table A1, Row I, Sections 1a and 1b. Use white and a light metallic (Lt. Met.) topcoat for Section 1a and all othe
37、r colors for Section 1b. 3.3.9.2 Primer Surfacer. If required, perform bakes and other tests for qualification of a pinchweld primer with primer surfacer as outlined in Table A1, Row I, Section 2. 3.3.9.3 ELPO. If required, perform bakes and other tests for qualification of a pinchweld primer with E
38、LPO as outlined in Table A1, Row I, Section 3. 3.3.10 Row J. Validation of masking tape for use in the windshield bond area for plant-specific application. Masking tape can be applied directly over electro-deposition primer, primer surfacer, or topcoat. The layer to which the tape is applied should
39、be given the minimum bake. Apply tape within 1 hour of coating bake completion. After the tape is applied, the next layer(s) of paint is (are) applied over the tape and baked at the upper bake limit. Use white topcoat over the tape for maximum solvent soak. Tape is removed after the last bake sequen
40、ce and the panel is examined visually for evidence of adhesive residue. Apply the plant-specific pinchweld primer and/or urethane adhesive directly to the panel without solvent wiping and test as indicated in Table A1. When masking to primer surfacer, test with a red surfacer instead of gray for pla
41、nts using color-keyed or color-specific products. All paint applications should be at target dry film. If no plant-designated tape is specified for technology qualification, use American Tape PG 21, Tesa Tape 7140 or 3M 2497ST Mask. 3.3.11 Row K. Validation of plant-specific variance to eliminate ma
42、sking or shielding of the windshield bond area when the polishing area is further than 607 mm from the windshield bond area. Polish must be approved Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without
43、 license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW16569 Copyright 2011 General Motors Company All Rights Reserved September 2011 Page 4 of 11 to an approved GM standard (reference 9982075). Use white topcoat at target bake and film as indicated in Table A1, Row K. Panels must be evaluated
44、for Tape Link-Up and Quick Knife Adhesion under three conditions: a. Control - No polish. b. Apply 76 Pm (approximately 5 cc) wet polish and air dry 30 minutes. Wipe one pass with dry cloth leaving visible dry polish residue. c. Apply 76 Pm (approximately 5 cc) wet polish and air dry 30 minutes. Wip
45、e one pass with cloth dampened with 9981062, VM perform QKA at each interval or until 100% cure and cohesive separation is established. When 100% cure and cohesive separation is established, expose sample to 168 hours at (38 3) C and (95 5)% RH per GMW14729, Option A. Allow samples to recover 24 hou
46、rs and perform QKA. 3.4.2.1 Initial Cure. Unless otherwise specified, cure test samples for 168 hours at (22 3) C and (50 5)% RH prior to performing required tests. 3.4.2.2 Humidity GMW14729, Option A. After the specified cure, expose samples for 168 hours at 38 C and (95 5)% RH per GMW14729, Option
47、 A. Unless otherwise specified, allow samples to recover 24 hours prior to performing required tests. 4 Manufacturing Process 4.1 Test sample preparation shall emulate manufacturing processes with respect to aging, dwell and bake times, temperatures and humidity. All such parameters shall be defined
48、 by the responsible GM Engineering Group within the guidelines of this document prior to the onset of testing. 5 Rules and Regulations 5.1 Legal Regulations. All materials must satisfy applicable laws, rules, regulations and recommendations valid in the country of usage. Copyright General Motors Com
49、pany Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW16569 Copyright 2011 General Motors Company All Rights Reserved September 2011 Page 5 of 11 5.2 Language. In the event of conflict between the English and domestic language, the English language shall take precedence. 5.3 Inspection and R
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