1、 WORLDWIDE ENGINEERING STANDARDS Material Specification GMW16583 Protective Back Coating for Second Surface Decorated Acrylic Ornamentation, Vehicle Exterior Copyright 2011 General Motors Company All Rights Reserved October 2011 Originating Department: North American Engineering Standards Page 1 of
2、3 1 Scope 1.1 Material Description. This standard covers the requirements of protective back coating system used to seal and protect vacuum deposited metallic coatings, decorative coatings (paint, or ink), and hot stamp foils applied to the second surface of acrylic ornamentation used on the vehicle
3、 exterior. The back coating must be applied within 2 h of the vacuum metallization process. 1.2 Symbols. Not applicable. 1.3 Typical Applications. Second surface decorated acrylic exterior emblems. 1.4 Remarks. 1.4.1 Protective back coatings for second surface decorated acrylic exterior emblems must
4、 meet the requirements of GMW14797 over acrylic, or over vacuum metalized aluminum. 1.4.2 Second surface decorated acrylic exterior emblems must meet the requirements of GMW16585. 2 References Note: Only the latest approved standards are applicable unless otherwise specified. 2.1 External Standards/
5、Specifications. None 2.2 GM Standards/Specifications. GMW3059 GMW16585 GMW3221 GMW16649 GMW14797 GMW16650 GMW16335 2.3 Additional References. TMC003 Material Safety Data Sheet guidance documents (available at ). 3 Requirements 3.1 Sample Conditioning. All samples are to be conditioned prior to each
6、requirement test to GMW3221, Code A, unless otherwise specified. 3.2 Test Samples. Test samples shall be plaques or parts injection molded from production intent acrylic plastic GMW16335P-PMMA-T2 or T3, and vacuum metallized with aluminum. They shall be partially coated with second surface decorativ
7、e coatings (GMW16649), or hot stamped foils (GMW16650), vacuum metallized, and then completely coated with protective back coatings. 3.3 Surface Preparation. None required when coating is clean, recently molded material. 3.4 Application. Reduce and apply uniformly to achieve a minimum dry film thick
8、ness of 43 m. The back coating must be applied within 2 h of the vacuum metallization process for optimum vacuum deposited metal adhesion to the acrylic emblem insert. The minimum dry film thickness may be achieved with a single coat or multiple coats. Report reducing solvents used, reduction ratios
9、 used, and actual dry film thickness. Caution: Some plastic compounds are sensitive to certain solvents to the extent that substrate failure could occur. Consult with the plastic and paint manufacturer for correct selection of reducing solvents. 3.5 Bake. Bake the back coatings using recommended tim
10、e and temperature. Report surface temperatures recorded during baking. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERINGTANDARDS GMW16583 Copyright 2011 General Motors Company All Rights Reserved October 2011 Page 2 of 3 3.6 Pe
11、rformance. 3.6.1 The performance of the back coating over vacuum metallized aluminum (VM) and over acrylic must meet the requirements of GMW14797. When testing over VM, run the tape adhesion tests without crosshatch cutting. 3.6.2 The performance of the finished part (decorated acrylic insert bonded
12、 into chrome plated bezel) must meet the requirements of GMW16585. 3.7 Lot Testing Requirements. See GMW14797 Table A10 for daily and weekly back coating test requirements. This includes determining the back coating film thickness. The requirement is a minimum thickness of 43 m. For each batch of em
13、blems, test a minimum of three emblems; one at the beginning of the batch, one in the middle, and one at the end of the batch. 4 Manufacturing Process Not applicable. 5 Rules and Regulations 5.1 Legal Regulations. All materials must satisfy applicable laws, rules, regulations and recommendations val
14、id in the country of usage. 5.2 Language. In the event of 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 r
15、equirements of this material specification and approved by 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 t
16、esting and documentation normally required for initial release 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.
17、If not otherwise agreed, all release tests shall be repeated 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. 5.4 Initial Source Appr
18、oval. No shipments shall be made by any supplier until representative 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
19、 submissions, or when a change in chemical composition of 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
20、country-specific MSDS/SDS requirements. In addition, product 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 requir
21、ements of GMW3059, Restricted and Reportable Substances for Parts. 6 Approved Sources Engineering qualifications of an approved source are required for this standard. Only sources listed in the GM Materials File GM Supply Power under this standard number have been qualified by Engineering as meeting
22、 the requirements of this standard. For other GM locations, the responsible Engineering group should be contacted to obtain the approved source in that individual country. 7 Notes 7.1 Glossary. Not applicable. 7.2 Acronyms, Abbreviations, and Symbols. Provided by IHSNot for ResaleNo reproduction or
23、networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERINGTANDARDS GMW16583 Copyright 2011 General Motors Company All Rights Reserved October 2011 Page 3 of 3 m micrometers GHS Globally Harmonized System MSDS Material Safety Data Sheets SDS Safety Data Sheets VM Vacuum Metallized Alu
24、minum 8 Coding System This standard shall be referenced in other documents, drawings, etc., as follows: Material per GMW16583 9 Release and Revisions This standard was originated in April 2011. It was first approved by the Emblem and Sill Plate Global Subsystem Leadership Team in September 2011. It was first published in October 2011. Issue Publication Date Description (Organization) 1 OCT 2011 Initial publication. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
