GMW-14170-2008.pdf
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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
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