GMW-14169-2008.pdf
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1、 WORLDWIDE ENGINEERING STANDARDS Material Specification Elastomer GMW14169 Requirements for Dense Elastomeric Body Seals Copyright 2008 General Motors Corporation All Rights Reserved August 2008 Originating Department: North American Engineering Standards Page 1 of 8 1 Introduction Note: Nothing in
2、this 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 dense elastomeric seals used in sealing body openings e.g., on door
3、s. 1.2 Mission/Theme. Not applicable. 1.3 Classification. 1.3.1 Material Description. The bulb or sealing portion of the weatherstrips shall be made from EPDM (ethylene propylene diene monomer) or TPE (thermoplastic elastomer). The specifications for the carrier shall be specified on the engineering
4、 part drawing or in the math data file. Weatherstrip assemblies shall consist of continuous extruded sections or sections joined together. These sections shall be joined by either transfer or injection molded joints, or mitered joints securely attached with suitable adhesive. Joint offsets in visibl
5、e and sealed areas must be no greater than 0.25 mm. 1.3.2 Coatings. When applied, coatings shall be non-abrasive and uniform in color, finish, and texture. Coatings must meet the requirements of color and gloss as established by GM Appearance Engineering. 1.3.3 Typical Applications. Typical applicat
6、ions include the following: sealing profiles in the body area, e.g., rocker seals, cutline seals. 2 References Note: Only the latest approved standards are applicable unless otherwise specified. 2.1 External Standards/Specifications. ISO 37 ISO 3865 ISO 48 ISO 7500-1 ISO 188 ISO 9513 ISO 868 ISO 235
7、29 ISO 1431-1 2.2 GM Standards/Specifications. GM9842P GMW14685 GMW3001 GMW14711 GMW3059 GMW14712 GMW14162 GMW14757 GMW14170 GMW15379 GMW14294 GMW15382 GMW14650 GMW15564 3 Test Preparation and Evaluation 3.1 Resources. 3.1.1 Calibration. The test facilities and equipment shall be in good working ord
8、er and shall have a valid calibration 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. Facilities shall c
9、onform to the relevant Test Procedures. 3.1.4 Equipment. Equipment shall conform to the relevant Test Procedures and to the test sketches on the part drawings. 3.1.4.1 Test Machine. The test machine shall fulfill the following requirements: The force-measuring device of the test machine shall corres
10、pond to ISO 7500-1 Class 1; the deflection measuring device shall correspond to ISO 9513 Class 0.2. The test machine shall be such that the required test velocity can be maintained. 3.1.5 Test Vehicle/Test Piece/Test Samples. Unless otherwise specified, the shape, size and number of test pieces shal
11、l be in accordance with the relevant Test Procedure. 3.1.5.1 The number of test pieces required for material and component approval is defined in Appendix A, Table A1. For Design and Product Validation, test pieces shall be cut from at least three finished parts and for Routine Quality Control from
12、at least one finished part. If straight test pieces cannot be obtained from the finished parts in appropriate length, straight -,-,- GMW14169 GM WORLDWIDE ENGINEERING STANDARDS Copyright 2008 General Motors Corporation All Rights Reserved Page 2 of 8 August 2008 samples from the same manufacturing b
13、atch shall be delivered unsolicited. 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. Not applicable. 3.3 Conditions. 3.3.1 Environmental Conditions. The minimum time between vulcanization and testing of elasto
14、mers 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. 3.3.2 Test Conditions. Not applicable. 3.4 Instructions. Not applicable. 3.5 Data. Not applicable. 3.6 Safety. This standard may involve
15、hazardous materials, operations, and equipment. This standard does not propose to address all the safety problems associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitati
16、ons prior to use. 3.7 Documentation. 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
17、to the component or material, e.g., 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 pr
18、oduct/process, and to apply for a 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
19、and the supplier. 3.7.1 Test Results. 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 requirements shall be specified on component drawings,
20、test certificates, reports, etc. 3.8 Dimensions and Tolerances. Dimensions and tolerances shall be specified on the engineering part drawing or in the math data file. 3.9 Installation Properties. Handling and requirements see relevant part drawing or Product Assembly Document (PAD). 4 Requirements a
21、nd Procedure 4.1 Appearance. Surfaces shall be smooth and free from voids, bubbles, and hard spots. The parts shall be free of mold release, bloom, or any other defects which may be deleterious to the appearance or sealing action. 4.1.1 Appearance Attributes. Appearance attributes shall be as specif
22、ied by GM Styling. 4.1.2 Blemish Requirements. All weatherstrips shall meet the engineering drawing or math data file for the Blemish requirements. 4.1.3 Carriers. Metal carriers/reinforcements must be specified on the drawing and in the math data file. Carriers must not be visible (i.e., must be co
23、ated or over molded). Molded joint offsets in visible areas and on seal surfaces must be no greater than 0.25 mm. 4.2 Performance Requirements (see Table 1 and Table 2). If a seal consists of several sections, the specified tests shall be conducted on each section. Unless otherwise stated, the tests
24、 and evaluations shall be performed at the temperature of 23 5C. 4.2.1 Prior to submission of finished parts, the supplier shall submit the required material test data for approval on sheet stock tested to Table 1 with the required number of samples per Appendix A, Table A1. Samples are to be taken
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