1、 WORLDWIDE ENGINEERING STANDARDS Material Specification GMW15645 Non-Decorative Plastic Powder Coatings Copyright 2013 General Motors Company All Rights Reserved September 2013 Page 1 of 7 1 Scope This specification covers plastic powder coatings that are fused on application to properly prepared me
2、tal substrates to form a continuous, durable coating for purposes such as wear resistance or squeak prevention. The powders may be applied by electrostatic spray, fluidized bed, or a variation thereof. 1.1 Material Description. Five (5) types are covered by this specification, as follows: Type I: A
3、thick epoxy coating for usages such as seat belt anchor plates, to provide corrosion resistance and prevent metal edges from cutting the webbing. Type II: A thinner epoxy coating used on various seat parts and other parts where prevention of metal-to-metal contact is required and where some degree o
4、f wear resistance is necessary. Type III: A thick nylon 11 or nylon 12 coating used on parts which are susceptible to high wear, to prevent squeaks, or to provide a thermal barrier. Type IV: A thinner nylon 11 or nylon 12 coating. Type V: A polyester coating for usages such as seat tracks, where som
5、e degree of wear resistance is necessary. Note: Some nylons must use a primer to meet the performance requirements of this specification. 1.2 Symbols. Suffix codes are to be added to the drawing notes to indicate location on the vehicle and if the coating is exposed to sunlight: Exterior (EX) = Exte
6、rior applications - includes underhood and underbody. Interior (IN) = Interior applications. Ultraviolet (UV) = Applications exposed to sunlight whether interior or exterior. 1.3 Typical Applications. These coatings are typically used for corrosion resistance, seat belt anchor plates, prevention of
7、metal-to-metal contact such as on seat parts, protection from wear, etc. Note: Epoxies should not be used in applications where they are exposed to sunlight. 1.4 Remarks. Appropriate suffix codes of materials approved under this specification shall be part of the approved sources documentation per S
8、ection 6. 2 References Note: Only the latest approved standards are applicable unless otherwise specified. 2.1 External Standards/Specifications. ASTM D870 ISO 105-A03 ISO 4892-2 ASTM D6677 ISO 4892-1 SAE J2527 2.2 GM Standards/Specifications. 9984123 GMW3221 GMW14333 GMW15827 9986321 GMW3286 GMW147
9、00 GMW3059 GMW3402 GMW14701 GMW3208 GMW14162 GMW14729 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 GMW15645 Copyright 2013 General Motors
10、 Company All Rights Reserved September 2013 Page 2 of 7 2.3 Additional References. TMC003 Material Safety Data Sheet guidance documents (available at ). 3 Requirements Unless otherwise indicated, the requirements shall pertain to all types and suffix codes. 3.1 Chemical Requirements. Component surfa
11、ces may use a pretreatment: e.g., zinc phosphate per 9984123 or thin film per 9986321 to meet performance requirements. 3.2 Physical Requirements. 3.2.1 Resin. Type I and Type II shall be epoxy. Type III and Type IV shall be nylon 11 or nylon 12. Type V shall be polyester. 3.2.2 Appearance. The coat
12、ing must be smooth, uniform and continuous with no evidence of voids, craters, sags, blisters, or other surface defects in the area specified to be coated. 3.2.3 Thickness. 3.2.3.1 Unless otherwise specified on the part drawing: Type I shall be 0.25 mm thick minimum. Type II shall be 0.025 mm thick
13、minimum. Type III shall be 0.38 mm 0.12 mm thick. Type IV shall be 0.15 mm 0.08 mm thick. Type V shall be 0.127 mm 0.025 mm thick. 3.2.3.2 Due to the thickness of these coatings, they should not be used in fastened joints. 3.3 Performance Requirements. The following tests are to be performed at cond
14、itions per GMW3221 Code A, 22 C 3 C and 50% 5% Relative Humidity (RH) unless otherwise specified. Testing shall be performed on parts or representative coated panels. Coated test panels shall only be used for initial material qualification and approval. Testing for parts approval (e.g., Production P
15、art Approval Process (PPAP) must be performed on actual parts. 3.3.1 Cure (Type I, Type II and Type V only). There shall be no softening of the coating or evidence of tackiness when a rag saturated with a solvent recommended by the powder supplier is placed on the coating for approximately 30 s. 3.3
16、.2 Adhesion and Humidity. 3.3.2.1 Suffix Codes EX and EX/UV. Parts or panels shall be exposed for 96 h to humidity per GMW14729. After exposure, there shall be no blistering or appearance change. Parts shall rate six (6) or better when tested per the procedure in Appendix B, Table B1. 3.3.2.2 Suffix
17、 Codes IN and IN/UV. Parts or panels shall be exposed for 24 h to humidity per GMW14729. After exposure, there shall be no blistering or appearance change. Parts shall rate six (6) or better when tested per the procedure in Appendix B, Table B1. 3.3.3 Neutral Salt Spray. 3.3.3.1 Suffix Code EX. Ther
18、e shall be no more than 10% blistering or peeling of the powder coating after 168 h neutral salt spray exposure per GMW3286. 3.3.3.2 Suffix Code EX/UV. There shall be no more than 10% blistering or peeling of the powder coating after 336 h neutral salt spray exposure per GMW3286. 3.3.3.3 Suffix Code
19、s IN and IN/UV. After 96 h exposure in neutral salt spray per GMW3286, there shall be no red rust or white corrosion on coated panels or parts. 3.3.4 Water Soak. Parts or panels shall be soaked for 127.5 minutes 7.5 minutes in Deionized Water at 38 C 1 C per ASTM D870. After exposure, there shall be
20、 no defects or metal corrosion. Samples shall rate six (6) or better when tested per the procedure in Appendix B, Table B1. 3.3.5 Resistance to Stone Impact (Suffix Code EX). Samples shall rate seven (7) or higher after testing per GMW14700, Method C. Copyright General Motors Company Provided by IHS
21、 under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW15645 Copyright 2013 General Motors Company All Rights Reserved September 2013 Page 3 of 7 3.4 Additional Requirements. The following tes
22、ts are for new material approvals only. They shall be conducted on coated panels. 3.4.1 Compatibility (Type I Only). The coating material must not stain, degrade or have any other detrimental effect on polyester seat belt webbing when tested per 3.4.1.1. 3.4.1.1 A light colored sample of seat belt w
23、ebbing shall be placed in contact with the coating and placed in a closed container for two (2) weeks at 93 C 2 C in an air circulating oven. A control sample of webbing not in contact with the coating shall be placed in a similar container and exposed at the same time and temperature. After exposur
24、e, comparison and evaluation of detrimental effects shall be made versus the control. 3.4.2 Environmental Resistance. After exposure and impact per the procedure in Appendix A, A1, the coating must show no chipping, cracking, blistering, softening, effect on adjacent materials, effect on corrosion r
25、esistance of the metal, staining, etc., objectionable change in color, or other detrimental effects (mushrooming without cracking when impacted is acceptable). 3.4.3 Resistance to Wear. Coated panels shall be subjected to 1000 cycles with CS17 wheels and a 1000 g load on the Taber Abraser, per GMW32
26、08. Weight loss of Type I and Type II shall be 0.06 g, maximum. Weight loss of Type III, Type IV, and Type V shall be 0.025 g, maximum. 3.4.4 Interior Finish Durability (Suffix Code IN/UV Only). 3.4.4.1 Test for Colorfastness to Light per GMW14162/D/601.1 kJ/m2. After exposure, coated panels shall s
27、how no objectionable gloss or color change, chalking, or other visible surface deterioration. 3.4.4.2 Effect of Cleaners. Coated panels shall be tested per GMW3402 Procedure B, Codes 1, 2, 3, 4, and 5. There shall be no discoloration of the surface or transfer of color to the cloth. The white cheese
28、cloth shall have a rating better than Grade 4 on the Chromatic Transference Scale per ISO 105-A03. 3.4.5 Exterior Finish Durability (Suffix Code EX/UV Only). Coated panels shall be exposed in xenon arc weatherometer per ISO 4892-1 and ISO 4892-2 as specified in 3.4.5.1 or per SAE J2527 Extended UV F
29、ilters as specified in 3.4.5.2 .Evaluate per 3.4.5.3. 3.4.5.1 ISO Procedure. Test as per the conditions of ISO 4892-1 and ISO 4892-2, as shown in Table 1. Panels shall be exposed for 3000 kJ/m2. Table 1: ISO Procedure Conditions Parameter Requirement Inner- and Outerfilter Borosilicate Radiant Expos
30、ure 0.50 W/m2 at 340 Nm Test Program Cam Number 7 102 minutes 0.5 minutes light only 18 minutes 0.5 minutes light and spray Black Standard Temperature +80 C 3 C 3.4.5.2 SAE Procedure. Test as per the conditions of SAE J2527 Extended UV Filters. 3.4.5.3 Evaluation. After exposure, there shall be no i
31、ndications of surface tackiness or embrittlement, blooming, blistering, change in hardness, color or gloss, or other factors which might affect the function or appearance of the part. 3.4.6 Resistance to Various Environmental Inputs (Suffix Code EX). 3.4.6.1 Temperature Resistance. After test panels
32、 are baked at 100 C 2 C for 24 h 1 h, there shall be no evidence of coating breakdown. 3.4.6.2 Fuel Resistance. Coated panels shall meet requirements of GMW14333, A, Rating 2. Adhesion shall be tested using the method in Appendix B, Adhesion Test. Panels shall rate eight (8) or better. Copyright Gen
33、eral 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 GMW15645 Copyright 2013 General Motors Company All Rights Reserved September 2013 Page 4 of 7 3.4.6.3 Oil
34、 Resistance. Test panels shall be immersed in engine oil per GMW15827 and then exposed for 24 h 1 h in a drying oven at +100 C 3 C. Evaluate after cooling to +23 C 5 C. There shall be no discoloration, change in gloss, shrinkage, swelling, dissolution, wrinkling or creasing, blistering, distortion,
35、or cracking. 3.4.6.4 Chemical Spot Test. Panels shall be tested per GMW14701, Method 1 and Method 2, using 10%, 1.0%, and 0.1% solutions by weight of Analytical Reagents of the following: Acetic Acid Hydrochloric Acid Sulfuric Acid Sodium Hydroxide After exposure, panels shall rate eight (8) minimum
36、. 4 Manufacturing Process Not applicable. 5 Rules and Regulations 5.1 Legal Regulations. All materials must satisfy applicable laws, rules, regulations and recommendations valid in the country of usage. 5.2 Language. In the event of conflict between the English and domestic language, the English lan
37、guage shall take precedence. 5.3 Inspection and Rejection. Samples of components or materials released to a GM material specification shall be tested for conformity with the requirements of this material specification and approved by the responsible Engineering department prior to commencement of de
38、livery of bulk supplies. A new approval must be received for any changes, e.g., properties, manufacturing process, location of manufacture, etc. If not otherwise agreed, all testing and documentation normally required for initial release must be completed. It is the responsibility of the supplier to
39、 inform the customer in a timely manner, without solicitation, and to include documentation of all modifications of materials and/or processes and to apply for a new release. If not otherwise agreed, all release tests shall be repeated and documented by the supplier prior to commencement of delivery
40、 of non-conforming bulk supplies. In individual cases, a shorter test can be agreed to between the responsible Engineering department and the supplier. 5.4 Material Safety Data Sheets/Safety Data Sheets (MSDS/SDS). For new product submissions, or when a change in chemical composition of an existing
41、product has occurred, a complete copy of the Material Safety Data Sheet/Safety Data Sheet must be submitted in compliance with the Globally Harmonized System of Classification and Labeling of Chemicals (GHS) requirements or other country-specific MSDS/SDS requirements. In addition, product MSDS/SDS
42、submissions must be in compliance with specific country General 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 requirements of GMW3059, Restricted and Reportable Substances for Parts. 6 A
43、pproved Sources Materials supplied to this specification must be approved by General Motors. The appropriate GM Materials Engineering department(s) must confirm material as meeting the requirements of this specification. Any test data sheets of material submitted to General Motors for such confirmat
44、ion (e.g., during Production Part Approval Process (PPAP) under this material specification must list all properties and must apply corresponding test methods of this material specification. Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo re
45、production or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW15645 Copyright 2013 General Motors Company All Rights Reserved September 2013 Page 5 of 7 7 Notes 7.1 Glossary. Not applicable. MATSPC: Global repository of GM approved materials for corresponding
46、GM Engineering Standards. 7.2 Acronyms, Abbreviations, and Symbols. ASTM ASTM International EX Exterior GHS Globally Harmonized System of Classification and Labeling of Chemicals IN Interior MSDS Material Safety Data Sheet PPAP Production Part Approval Process RH Relative Humidity SAE SAE Internatio
47、nal SDS Safety Data Sheet UV Ultraviolet 8 Coding System This standard shall be referenced in other documents, drawings, etc., as follows: Material per GMW15645 Type W-YY/ZZ Where: W is (1) one of five (5) types described in paragraph 1.1, YY is either IN for interior applications or EX for exterior
48、 applications, and ZZ is UV, which is only used if the coated component will be exposed to sunlight. Examples: GMW15645 Type IV-IN/UV is a nylon coating that is used on a component that is located inside the vehicle where it may be exposed to through glass sunlight. GMW15645 Type II-EX is an epoxy c
49、oating that is used on a component that is located underhood or underbody. 9 Release and Revisions This standard was originated in July 2007. It was first approved by the Global Finish Team in June 2008. It was first published in June 2008. Issue Publication Date Description (Organization) 1 JUN 2008 Initial publication. 2 SEP 2013 Updated to current template.
