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1、 WORLDWIDE ENGINEERING STANDARDS Material Specification Elastomer GMW14170 Coating Requirements for Elastomeric Seals Copyright 2008 General Motors Corporation All Rights Reserved August 2008 Originating Department: North American Engineering Standards Page 1 of 7 1 Introduction Note: Nothing in thi
2、s standard supersedes applicable laws and regulations. Note: In the event of conflict between the English and domestic language, the English language shall take precedence. 1.1 Scope. This specification covers the requirements of coatings on weatherstrips in the body area. 1.2 Mission/Theme. Not app
3、licable. 1.3 Classification. Not applicable. 2 References Note: Only the latest approved standards are applicable unless otherwise specified. 2.1 External Standards/Specifications. ISO 105-X12 ISO 23529 ISO 188 2.2 GM Standards/Specifications. 9981062 GME8555 9982223 GMW14650 9984242 GMW14757 998425
4、9 GMW3001 9984434 GMW3059 9984505 GMW15691 9984508 GMW15726 9984515 L 000 0207 9985670 L 000 0242 B 040 0218 L 000 0555 B 440 0029 L 000 0556 3 Test Preparation and Evaluation 3.1 Resources. 3.1.1 Calibration. The test facilities and equipment shall be in good working order and shall have a valid ca
5、libration label. 3.1.2 Alternatives. Alternative test facilities and equipment may also be used. However, all measuring variables as specified in this specification shall be determined correctly with respect to its physical definition. 3.1.3 Facilities. Conforming to the relevant Test Procedures. 3.
6、1.4 Equipment. Conforming to the relevant Test Procedures. 3.1.4.1 Suitable apparatus for determination of the thickness of the coating. (Reference GMW15726). 3.1.4.2 Scalpel suitable for cross-hatching through the coating. 3.1.4.3 Adhesive tape: Scotch 8981, Tesaband 4651, Tesaband 4661, or equival
7、ent. 3.1.4.4 Mandrel of diameter 50 mm. 3.1.5 Test Vehicle/Test Piece/Test Samples. Unless otherwise specified, the shape, size and number of test pieces shall be in accordance with the relevant Test Procedure. The number of test pieces required for material approval is defined in Appendix A Table A
8、1. For Design and Product Validation, test pieces shall be cut from at least three finished parts; for Routine Quality Control from at least one finished part. 3.1.6 Test Time. Not applicable 3.1.7 Test Required Information. Not applicable. 3.1.8 Personnel/Skills. Not applicable. 3.2 Preparation. No
9、t applicable. 3.3 Conditions. The minimum time between vulcanization and testing of elastomers shall be 72 h. The test pieces shall be maintained at a temperature of 23 5C for at least 8 h prior to test and shall be free from strain during this period. 3.3.1 Environmental Conditions. Not applicable.
10、 3.3.2 Test Conditions. Not applicable. 3.4 Instructions. Not applicable. 3.5 Data. Not applicable. 3.6 Safety. This standard may involve hazardous materials, operations, and equipment. This standard does not propose to address all the safety problems associated with its use. It is the responsibilit
11、y of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. GMW14170 GM WORLDWIDE ENGINEERING STANDARDS Copyright 2008 General Motors Corporation All Rights Reserved Page 2 of 7 August 2008 3.7 Documentat
12、ion. Samples of components or material released to this standard shall be tested for conformity with the requirements of this standard and approved by the responsible GM Department prior to the start of delivery of production level components or materials. Any change to the component or material e.g
13、., design, function, properties, manufacturing process and/or location of manufacture requires a new release of the product. It is the sole responsibility of the supplier to provide the customer, unsolicited, with documentation of any change or modification to the product/process, and to apply for a
14、 new release. If not otherwise agreed to, the entire verification test shall be repeated and documented by the supplier prior to start of delivery of the modified or changed product. In some cases a shorter test can be agreed to between the responsible GM Department and the supplier. 3.7.1 Test Resu
15、lts. With reference to this standard the test results shall be presented in a test report. 3.7.2 Deviations from this Standard. Deviations from the requirements of this standard shall have been agreed upon. Such deviations shall be specified on component drawings, test certificates, reports, etc. 4
16、Requirements and Procedure 4.1 Appearance. The sealing surface shall be coated in the area defined on the drawing or in the math data file. The coating shall be uniform and free from breaks or porosity. 4.2 Performance Requirements. If a seal consists of several sections, the specified tests shall b
17、e conducted on each section. Unless otherwise stated, the tests and evaluations shall be performed at the temperature of 23 5C. See Table 1. Samples are to be taken from finished parts. Table 1: Coating Requirements Property Test Procedure Unit Value 4.2.1 Coating Thickness Measurement All Types GMW
18、15726 coating thickness, but: coating thickness silicone coatings microns microns 7 minimum 3 minimum Unless otherwise specified on drawing or math data file 4.2.2 Adhesion Strength All Types Square cut test piece of 20 mm minimum. The coating shall be cross-hatched through to the base material at i
19、ntervals of 1 mm. The adhesive tape shall be pressed onto the surface of the cured lacquer, such that its side edge is at an angle of 45 to the cross-hatching lines. Visual Inspection after stripping off the tape, no cured coating shall be removed from the test piece. 4.2.3 Heat Resistance All Types
20、 ISO 188 Method B, 24 (-2) h at 90 3C Test piece: length 200 5 mm , width 4 1 mm, thickness 1-2 mm Visual Inspection. Bend 180 around radius of 25 0.5 mm. Visual Examination no visual change in coating No cracks no loss of adhesion 4.2.4 Cold Resistance (Low Temperature Flexibility) All Types ISO 23
21、529, -40 3C; 4 0.5 h, Test piece: length 200 5 mm , width 4 1 mm, thickness 1-2 mm. Bend 180 around radius of 25 0.5 mm. Visual Examination No cracks no loss of adhesion WORLDWIDE ENGINEERING STANDARDS GMW14170 Copyright 2008 General Motors Corporation All Rights Reserved August 2008 Page 3 of 7 Pro
22、perty Test Procedure Unit Value 4.2.5 Chemical and Abrasion Resistance All Types ISO 105-X12. (Crockmeter) Test piece shall have a uniform thickness over the total width. If the width of the test piece is smaller than the rubbing finger, the downward force shall be reduced adequately (See Table B2 i
23、n Appendix B). Test Conditions: Cylinder 16 mm diameter, 80 mm minimum travel, 1 cycle/s, cotton crocking cloth. Downward force of 9 N, the coating shall not be abraded after any of the following tests (one cycle shall be one to and fro movement). Dry test fabric. Wet test fabric (Deionized water).
24、Pre-wetting shall be repeated after 50 cycles. With test fabric soaked in cleaning anti-freeze solution B 040 0218 (2-Propanol): Water = 1:2. Pre-wetting shall be repeated after 50 cycles. test fabric soaked in Windshield Wash Solvent 9985670 (Methanol): Water = 2:3. Pre-wetting shall be repeated af
25、ter 50 cycles. No judgment shall be made of the cloth; only the coated surface shall be evaluated. cycles cycles cycles cycles 100 minimum 100 minimum 100 minimum 100 minimum 4.2.6 Coating Cure Test All Types ISO 105-X12. (Crockmeter) Test piece shall have a uniform thickness over the total width. I
26、f the width of the test piece is smaller than the rubbing finger, the downward force shall be reduced adequately (See Table B2 in Appendix B). Test Conditions: Cylinder 16 mm diameter, 80 mm minimum travel, 1 cycle/s, cotton crocking cloth. Downward force of 4.3 N, 5 cycles (one cycle shall be one t
27、o and fro movement). naphtha (9981062 or B 440 0029) Rating 0 or 1 to Table B1 in Appendix B The rating of the coated surface overrides the rating of the cloth, if only cloth is out of requirement. 4.2.7 Cleaning and Solvent Resistance All Types ISO 105-X12. (Crockmeter) Test piece and Test Conditio
28、ns: see Chemical and Abrasion resistance downward force of 4.3 N, 10 cycles (one cycle shall be one to and fro movement). Protective wax to L 000 0555 and L 000 0556 or 9982223 Commercial car shampoo (e.g., Sonax 314300). Commercial paintwork cleaning product (e.g., Sonax 302200). Commercial Househo
29、ld Ammoniated Window Cleaner (e.g., Windex). Commercial Chrome cleaner and Polish (e.g., GM Chrome Cleaner and Polish, PN 1050173). No staining, discoloration, surface softening, or loss of grain Rating 0 or 1 to Table B1 in Appendix B. The rating of the coated surface overrides the rating of the cl
30、oth, if only cloth is out of requirement. 4.2.8 Wear Resistance Test Body Mounted Primary Seals Only GMW15691 cycles 600 minimum -,-,- GMW14170 GM WORLDWIDE ENGINEERING STANDARDS Copyright 2008 General Motors Corporation All Rights Reserved Page 4 of 7 August 2008 Property Test Procedure Unit Value
31、4.2.9 Weatherometer Note 1 Only on parts where the coated surface is exposed GMW14650, Weather-Ometer Resistance Class 3 Change of surface Color change E Visual color change that is considered unacceptable shall override the E measurement. Examination of surface under 50X magnification: No surface t
32、ackiness or embrittlement, No change in hardness, No blooming, blistering or other factors that may affect function or appearance. 3.0 max No objectionable surface defects or color change No cracking, pores or other surface damage 4.2.10 Test on Substances that could Affect Repair Painting Parts wit
33、h direct contact to painted body panels GME8555. Test material is positioned on a test panel and loaded with a cylindrical weight of 1 kg and a diameter of 50 mm. The test material is pulled by hand 5 times in both directions over the length of the panel. (GME8555 Pos. 5.3.5.1) Paint Application - T
34、he test panel is painted with; L0000207 solid color waterborne Basecoat + L000 0242 Clear coat 9984434 Basecoat + 9984259 and 9984515 Clear coat 9984505 Basecoat + 9984242 and 9984508 Clear coat according to the paint material specification. (GME8555 Pos. 5.3.15) Evaluation of the painted test panel
35、 after bake. Further information, see GME8555. The surface shall be free from paint irritation. or craters 4.2.11 Resistance to Adhesion to Glass, Paint, or other Mating Materials All Types GMW14757 dry and wet (tap water) conditions pull off force N 4 maximum There shall be no transfer of coating t
36、o the glass, painted panel, or other mating substrate material Note 1: Other than class 3 requirements must be specified on drawing or math data file. 4.3 Material. See part drawing or math data file. 5 Provisions for Shipping 5.1 Approved Sources. Engineering qualifications of an approved source is
37、 required for this standard. Only sources listed in the GM Materials File (e.g., MATSPC) under this standard number have been qualified by engineering as meeting the requirements of this standard. 5.2 Other Additional Requirements. See relevant component drawings for additional requirements. 6 Notes
38、 6.1 Glossary. Not applicable. 6.2 Acronyms, Abbreviations, and Symbols. Not applicable. WORLDWIDE ENGINEERING STANDARDS GMW14170 Copyright 2008 General Motors Corporation All Rights Reserved August 2008 Page 5 of 7 7 Additional Paragraphs 7.1 All materials supplied to this standard must comply with
39、 the requirements of GMW3001, Rules and Regulations for Materials Specifications. 7.2 All materials supplied to this standard must comply with the requirements of GMW3059, Restricted and Reportable Substances for Parts. 8 Coding System This standard shall be referenced in other documents, drawings,
40、etc, as follows: GMW14170 9 Release and Revisions 9.1 Release. This standard originated in June 2005. It was first approved by the Global Elastomer Team in April 2005. It was first published in June 2006. It supersedes all regional standards for Coating Requirements for Elastomeric Seals for use on
41、Global Engineered materials including but not limited to EDS-M-7306, GME 01002, GMN10029, and HN2085. 9.2 Revisions. Rev Approval Date Description (Organization) A AUG 2008 Complete revision, replacing local test standards with respective GMW standards. (Global Elastomers Team) -,-,- GMW14170 GM WOR
42、LDWIDE ENGINEERING STANDARDS Copyright 2008 General Motors Corporation All Rights Reserved Page 6 of 7 August 2008 Appendix A Table A1: Test Pieces Required GM WORLDWIDE ENGINEERING STANDARDS GMW14170 Copyright 2008 General Motors Corporation All Rights Reserved August 2008 Page 7 of 7 Appendix B Table B1: Coating Cure Test Ratings. Table B2: Force Reduction Guidelines