1、 WORLDWIDE ENGINEERING STANDARDS Material Specification GMW16688 Performance Requirements Exterior Adaptive Cruise Control Emblem Copyright 2012 General Motors Company All Rights Reserved January 2012 Originating Department: North American Engineering Standards Page 1 of 5 1 Scope 1.1 Material Descr
2、iption. This specification covers the performance requirements of an exterior emblem that is located in the vehicle grille, and used with an adaptive cruise control system. 1.2 Symbols. Not applicable. 1.3 Typical Applications. Not applicable. 1.4 Remarks. A protective hard coating is required on th
3、e first surface for weathering and abrasion resistance. The approved hard coating is 9984271 (UV cure), or optional 9982273 (thermal cure). The hardcoating dry film thickness (DFT) must meet the minimum DFT recommended by the supplier. Hardcoating/substrate performance must meet GMW14797. 2 Referenc
4、es Note: Only the latest approved standards are applicable unless otherwise specified. 2.1 External Standards/Specifications. SAE J2527 2.2 GM Standards/Specifications. 9982273 GMW3059 GMW3286 GMW14124 GMW14334 GMW14729 GMW14797 GMW14873 2.3 Additional References. 9982273 thermal cure hard coating 9
5、984271 UV cure hard coating TMC003 Material Safety Data Sheet guidance documents (available at ). 3 Requirements 3.1. After any of the exposures in Table 1, there shall be no objectionable surface deterioration (including, but not limited to chalking, crazing, tackiness, distortion, blistering) or o
6、bjectionable color or gloss change. There shall be no loss of adhesion between layers (delamination), or between the emblem and the substrate. Prior to evaluation, wash samples using a sponge saturated with a solution consisting of a mild liquid detergent, such as unscented liquid Ivory or Joy (or e
7、quivalent) dishwashing soap, and deionized or distilled water at a ratio of 5:95. 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 GMW16688 C
8、opyright 2012 General Motors Company All Rights Reserved January 2012 Page 2 of 5 Table 1: Finished Part Performance Requirements Properties Test Methods Humidity Resistance GMW14729, 7 days exposure. Evaluate after 24 h ambient exposure. Neutral Salt Spray Resistance GMW3286, 96 h, unscribed specim
9、ens. Moisture and Cold Resistance GMW14124, Cycle A, 15 cycles. Humidity Thermal Cycle Resistance GMW14124, Cycle F, 3 cycles. Heat Aging Resistance 168 h 70 C in an air-circulating oven. Cleaning/Solvent Resistance GMW14334, B-Rating 1. Accelerated Weather Resistance Color Change Maximum E 3.0 Xeno
10、n Arc Apparatus. Samples shall be exposed to 2500 kJ/m2 (for Production Part Approval Process (PPAP), and 4500 kJ/m2 per SAE J2527 with extended ultraviolet (UV) filters. Natural Weathering Note 1 Color Change Maximum E 3.0 1 and 2 years exposure angles in Florida (5) and Arizona (45), direct weathe
11、r open rack per GMW14873. Note 1: See 3.2. 3.2. Not required for PPAP. Test samples will be on exposure in Florida and Arizona and will be submitted to Materials Engineering upon completion. 3.3 Thermal Shock plus Rain-X Original Immersion. 3.3.1 Scope. Test ten emblem assemblies through cold and ho
12、t cycles followed by chemical immersion in Rain-X Original Glass Treatment (yellow bottle) to ensure environmental robustness. Required for initial approval. 3.3.2 Procedure: Thermal Shock plus Rain-X Original Immersion. 3.3.2.1 Cold soak emblems at -40 C for 4 h. After 4 h, immediately put the embl
13、ems into thermal chamber at 70 C for 20 minutes followed by -40 C for 20 minutes. Repeat this hot/cold cycle four (4) times for a total of five (5) cycles. After the final cold cycle, remove parts and let them come to ambient temperature for 30 minutes. 3.3.2.2 Place enough Rain-X Original Glass Tre
14、atment in a shallow container and fill to a level that will cover the emblem when emblem is submerged. 3.3.2.3 Submerge the emblem into the solution for 1 minute assuring that there is adequate solution to cover the interfaces between the acrylic insert and the bezel (if applicable). 3.3.2.4 Remove
15、emblem and lightly shake and tilt emblem to remove any residual solution. (There will still be solution between the components.) 3.3.2.5 Do not dry the part. 3.3.2.6 Place in a rack or fixture that would allow the emblem to sit in a vertical position unless otherwise directed. 3.3.2.7 Place in humid
16、ity chamber (GMW14729, Option A) for 24 h. 3.3.2.8 Repeat 3.3.2.2 thru 3.3.2.7 two more times (a total of three immersion cycles). 3.3.2.9 Remove emblem from the chamber and inspect the emblem. 3.3.3 Requirement: Thermal Shock plus Rain-X Original Immersion. No objectionable first or second surface
17、deterioration (including, but not limited to chalking, crazing, tackiness, distortion, blistering, objectionable color or gloss change, deposited metal corrosion, or adhesion loss). 3.4 Liquid Dye Penetration Test. Copyright General Motors Company Provided by IHS under license with General Motors Co
18、mpanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW16688 Copyright 2012 General Motors Company All Rights Reserved January 2012 Page 3 of 5 3.4.1 Scope. Test standards test population of ten emblem assemblies through the liqu
19、id dye penetration test to visually detect contamination intrusion into the part. This test uses full emblem assemblies that are assembled using non-decorated (no decorative coatings/deposited metals) clear lenses so any intrusion of dark food coloring may be visible after test. 3.4.2 Materials Requ
20、ired: Liquid Dye Penetration Test. Pressurized container large enough to submerge part(s) for test. See Appendix A for an example. Black, blue, red, or green food coloring (28.3 g of dye per 3.8 L of water). 3.4.3 Procedure: Liquid Dye Penetration Test. 3.4.3.1 Prepare emblem assemblies with a trans
21、parent lens (no decorative coatings or deposited metals). 3.4.3.2 Emblems shall stabilize at room temperature for 24 h. 3.4.3.3 Use dark food coloring (blue, black, red, or green) that provides the strongest visual contrast to the injected molded material, mixing 28.3 g of dye per 3.8 L of water. 3.
22、4.3.4 Submerge parts in solution and pressurize container at 69 kPa for 1 minute. 3.4.3.5 Depressurize chamber and remove parts. The liquid may start to flow back out of recesses, if the parts are allowed to sit for prolonged periods of time. 3.4.3.6 Within 10 minutes after removing from the contain
23、er, look for evidence of dye/water solution intrusion between the decorated lens and the injected molded material. 3.4.3.7 Photograph results within 30 minutes. 3.4.4 Requirement: Liquid Dye Penetration Test. If there is any food coloring (colored liquid solution) that penetrates behind the decorate
24、d lens, the part fails the test. 3.5 Cold Impact. 3.5.1 Immediately after assembly, as detailed in 3.2, samples shall be placed in -30 C 2 C cold chamber for 4 h minimum. Each assembly must withstand two 1.7 J impacts. 3.5.2 After moisture and cold resistance cycling (15 cycles) plus 24 h minimum at
25、 -30 C 2 C soak, each assembly must withstand two 1.7 J impacts. Note: The decision to face or reverse impact will be determined by the assembly application and shall rest with the responsible Engineering Group. 3.6 Radar Test. The maximum 2-way attenuation as received, and after Xenon accelerated w
26、eathering, shall be less than or equal to 3.6 dB when tested between 76 GHz to 77 GHz. Examples of measurement systems are the Anritsu Material Measurement System (using the SM 5899 Radar Alignment System) or the Conti Test Method, or equivalent. 100% end of line testing is required. Contact the Des
27、ign Engineer for the appropriate material measurement system to use. 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
28、conflict between the English and domestic language, the English language 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
29、 the responsible 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 of manufacture, etc. If not otherwise agreed, all testing and documentation normally required for initial rel
30、ease must be completed. It is the responsibility of the supplier to 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 repeat
31、ed and documented by the supplier prior to commencement of delivery of non-conforming bulk supplies. In individual cases, a shorter test can be agreed to between the responsible Engineering department and the supplier. Copyright General Motors Company Provided by IHS under license with General Motor
32、s CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW16688 Copyright 2012 General Motors Company All Rights Reserved January 2012 Page 4 of 5 5.4 Initial Source Approval. No shipments shall be made by any supplier until rep
33、resentative initial production samples have been approved by the appropriate Materials Engineering department(s) as meeting the requirements of this specification. 5.5 Material Safety Data Sheets/Safety Data Sheets (MSDS/SDS). For new product submissions, or when a change in chemical composition of
34、an existing 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, produ
35、ct MSDS/SDS submissions must be in compliance with specific country General Motors TMC003 Material Safety Data Sheet/Safety Data Sheet guidance documents where available. 5.6 All materials supplied to this standard must comply with the requirements of GMW3059, Restricted and Reportable Substances fo
36、r Parts. 6 Approved Sources Engineering qualifications of an approved source are required for this standard. Only sources listed in the GM Materials File (i.e., MATSPC) under this standard number have been qualified by Engineering as meeting the requirements of this standard. For other GM locations,
37、 the responsible Engineering group should be contacted to obtain the approved source in that individual country. 7 Notes 7.1 Glossary. MATSPC: Global repository of GM approved materials for corresponding GM Engineering Standards. 7.2 Acronyms, Abbreviations, and Symbols. DFT Dry Film Thickness GHS G
38、lobally Harmonized System MSDS Material Safety Data Sheet PPAP Production Part Approval Process SDS Safety Data Sheet UV Ultraviolet 8 Coding System This standard shall be referenced in other documents, drawings, etc., as follows: Material per GMW16688 9 Release and Revisions This standard was origi
39、nated in September 2011. It was first approved by the Emblems, Nameplates & Sill Plates Global Subsystem Leadership Team in January 2012. It was first published in January 2012. Issue Publication Date Description (Organization) 1 JAN 2012 Initial publication. Copyright General Motors Company Provide
40、d by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW16688 Copyright 2012 General Motors Company All Rights Reserved January 2012 Page 5 of 5 Appendix A A1 Water Filter Housing Use standard water filter housing. Attach a pressure gage and a pressurized air line. Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
