1、 WORLDWIDE ENGINEERING STANDARDS Material Specification GMW16585 Performance Requirements - Exterior Acrylic Ornamentation, Second Surface Decorated Copyright 2011 General Motors Company All Rights Reserved August 2011 Originating Department: North American Engineering Standards Page 1 of 5 1 Scope
2、1.1 Material Description. 1.1.1 General Construction. The ornamentation usually consists of an acrylic insert bonded into a bezel which in turn is bonded or mechanically attached to the vehicle. Styling requirements determine whether the acrylic material will be transparent, translucent, or opaque.
3、Normally decorative coatings are applied to the acrylic second surface. These coatings may be inks, paints, hot stamps, or vacuum deposit metals used singularly or in combination. Decorative coatings that incorporate vacuum deposited metals must be sealed with protective backcoats, and either full d
4、ouble-coated foam tape coverage, or a full perimeter bead of Room Temperature Vulcanization (RTV) silicone to prevent degradation. Additional specific construction and appearance requirements need to be described on the part drawing. 1.2 Symbols. Not applicable. 1.3 Typical Applications. Exterior em
5、blems. 1.4 Remarks. 1.4.1 Second surface decorative coatings and backcoatings must meet the requirements of GMW14797. 1.4.2 Second surface decorative hot stamp foils must meet the requirements of GM6139M Class E2. 2 References Note: Only the latest approved standards are applicable unless otherwise
6、specified. 2.1 External Standards/Specifications. SAE J1960 SAE J2527 2.2 GM Standards/Specifications. GM6139M GMW14334 GMW3059 GMW14458 GMW3221 GMW14729 GMW3286 GMW14797 GMW14124 GMW14892 2.3 Additional References. TMC003 Material Safety Data Sheet guidance documents (available at ). 3 Requirements
7、 3.1 Sample Conditioning. All samples are to be conditioned prior to each performance requirement test. Use GMW3221, Code A unless otherwise specified. Performance requirement testing shall be done using finished assemblies, i.e., decorated acrylic inserts bonded to the appropriate substrate. See 3.
8、2, 3.3, 3.4, and Table 1. 3.2 Thermal Shock Plus Rain-X Original (Glass Treatment) Immersion Test. 3.2.1 Scope. Test 10 emblem assemblies through cold and hot cycles followed by chemical immersion in Rain-X Original (yellow bottle) to ensure environmental robustness. Required for initial approval. 3
9、.2.2 Procedure: Thermal Shock Plus Rain-X Original Immersion. 3.2.2.1 Cold soak emblems at -40 C for 4 h. After 4 h, immediately put the emblems into thermal chamber at 70 C for 20 minutes followed by -40 C for 20 minutes. Repeat this hot/cold cycle 4 times for a total of 5 cycles. After the final c
10、old cycle, remove parts and let them come to ambient temperature for 30 minutes. 3.2.2.2 Place enough Rain-X Original in a shallow container and fill to a level that will cover the emblem when it is submerged. 3.2.2.3 Submerge the emblem into the solution for 1 minute assuring that there is adequate
11、 solution to cover the interfaces between the acrylic insert and the bezel (if applicable). 3.2.2.4 Remove emblem and lightly shake and tilt emblem to remove any residual solution. (There will still be solution between the components). 3.2.2.5 Do not dry the part. 3.2.2.6 Place in a rack or fixture
12、that would allow the emblem to sit in a vertical position unless otherwise directed. 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 GMW1658
13、5 Copyright 2011 General Motors Company All Rights Reserved August 2011 Page 2 of 5 3.2.2.7 Place in humidity chamber (GMW14729, Option A) for 24 h. 3.2.2.8 Repeat 3.2.2.2 through 3.2.2.7 two more times (a total of 3 immersion cycles). 3.2.2.9 Remove emblem from the chamber and inspect the emblem. 3
14、.2.3 Requirement: Thermal Shock Plus Rain-X Original Immersion. For a standard sample size of 10 parts, the maximum allowable average corrosion squares score is 5, with none of the 10 parts having an individual score of greater than 5. See 3.2.4 for scoring corrosion on tested samples. Corrosion is
15、only allowed on edges of the insert. 3.2.4 Report Procedure for Measuring Corrosion Squares. Using the sample population of 10 parts that went through the thermal cycling and immersion, prepare grid paper with each square 5 mm x 5 mm and copy the grid onto a transparent sheet. Overlay the transparen
16、t sheet with 5 mm x 5 mm grid onto the failed emblem and mark each square that has some corroded area underneath it. Add the total number of squares that are marked and then divide by 10. This will give the average corrosion squares for the sample population. A perfect score would be an average of 0
17、 corrosion squares. See Figure 1 for representative tested parts with Corrosion Square Scores of 5. Report the number of corrosion squares and the total number of possible squares (total area). Figure 1: Representative Tested Parts that Have a Corrosion Square Score of 5 3.3 Liquid Dye Penetration T
18、est. 3.3.1 Scope. Test standard test population of 10 emblem assemblies through the liquid dye penetration test to visually detect contamination intrusion into a sealed part. This test uses full emblem assemblies that are assembled using non-decorated (no vacuum metalizing/backcoating) clear lenses
19、so any intrusion of dark food coloring may be visible after test. 3.3.2 Materials Required: Liquid Dye Penetration Test. x Pressurized container large enough to submerge part(s) for test. See Appendix A for an example. x Black, blue, red or green food coloring (28.3 g dye per 3.8 L of water). 3.3.3
20、Procedure: Liquid Dye Penetration Test. 3.3.3.1 Prepare emblem assemblies with a transparent lens (no Vacuum Metalized Aluminum (VM), decorative coatings, hot stamp foils, or backcoating. 3.3.3.2 Use a dark food coloring (blue, black, red or green) that provides the strongest visual contrast to the
21、tape/RTV between the lens and bezel, mixing 28.3 g dye per 3.8 L of water. 3.3.3.3 Parts with tape shall stabilize at room temperature for 30 minutes. Parts with RTV shall stabilize at room temperature for 24 h. 3.3.3.4 Submerge parts in solution and pressurize container for 69 kPa for 1 minute. 3.3
22、.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. 3.3.3.6 Within 10 minutes after removing the container, look for evidence of dye/water solution intrusion against chrome bezel penetrated past
23、the adhesive tape or RTV bead perimeter. 3.3.3.7 Photograph results within 30 minutes. 3.3.4 Requirement: Liquid Dye Penetration Test. If there is any food coloring (colored liquid solution) that penetrates past the tape edge or RTV bead and is visible in sealed area of clear lens, the part fails th
24、e test. 3.4 Environmental Performance Tests. 3.4.1 Scope. Test 5 samples through each environment (a total of 40 parts minimum) in Table 1 to prove good performance across a range of environmental exposures. Copyright General Motors Company Provided by IHS under license with General Motors CompanyNo
25、t for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW16585 Copyright 2011 General Motors Company All Rights Reserved August 2011 Page 3 of 5 Table 1: Environmental Tests for Initial Approval Properties Test Method Humidity Resistance
26、GMW14729, Option A, 168 h exposure Neutral Salt Spray Resistance GMW3286, 96 h unscribed specimens Moisture and Cold Resistance GMW14124, Cycle A, 15 cycles Humidity Thermal Cycle Resistance GMW14124, Cycle F, 3 cycles Cleaning/Solvent Resistance GMW14334-B-Rating 1 Heat Aging Resistance 168 h at 70
27、 C in an air-circulating oven Accelerated Weather Resistance Xenon Arc Apparatus. SAE J2527 with extended ultraviolet (UV) filters. Samples shall be exposed to 2500k J/m2 for Product Part Approval Process (PPAP), and 4500 kJ/m per SAE J1960, quartz inner and borosilicate outer filters, 0.55 kJ/m irr
28、adiance. Copper Accelerated Acetic Acid Salt Spray (CASS) GMW14458, 48 h 3.4.2 Requirement: Environmental Performance. After each exposure in 3.4, no detrimental effects such as, but not limited to, color change, gloss change, chalking, crazing, tackiness, corrosion, distortion, loss of adhesion, et
29、c. 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 la
30、nguage 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 d
31、elivery 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 t
32、o 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 deliver
33、y 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 Approval. No shipments shall be made by any supplier until representative initial production samples have been approved by the a
34、ppropriate 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 an existing product has occurred, a complete copy of the Material
35、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 submissions must be in compliance with specific countr
36、y 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 for Parts. 6 Approved Sources Engineering qualifications of an appro
37、ved 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 the requirements of this standard. For other GM locations, the responsible Engineering group should be contacted to obtai
38、n the approved source in that individual country. 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 GMW16585 Copyright 2011 General Motors Com
39、pany All Rights Reserved August 2011 Page 4 of 5 7 Notes 7.1 Glossary. Not applicable. 7.2 Acronyms, Abbreviations, and Symbols. CASS Copper Accelerated Acetic Acid Salt Spray GHS Globally Harmonized System MSDS Material Safety Data Sheet PPAP Production Part Approval Process RTV Room Temperature Vu
40、lcanization SDS Safety Data Sheet UV Ultraviolet VM Vacuum Metalized Aluminum 8 Coding System This standard shall be referenced in other documents, drawings, etc., as follows: Performance Requirements of second surface decorated exterior acrylic ornamentation per GMW16585. 9 Release and Revisions Th
41、is standard was originated in April 2011. It was first approved by the Emblem and Sill Plate Global Subsystem Leadership Team in August 2011. It was first published in August 2011. Issue Publication Date Description (Organization) 1 AUG 2011 Initial publication. Copyright General Motors Company Prov
42、ided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW16585 Copyright 2011 General Motors Company All Rights Reserved August 2011 Page 5 of 5 Appendix A Use standard water filter housing. Attach a pressure gage, and a pressurized air line Figure A1: Example of Pressurization Container Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
