GMW-14147-2008.pdf
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1、 WORLDWIDE ENGINEERING STANDARDS General Specification Elastomers GMW14147 Requirements for Expanded Elastomeric Body Seals Copyright 2008 General Motors Corporation All Rights Reserved April 2008 Originating Department: North American Engineering Standards Page 1 of 9 1 Introduction Note: Nothing i
2、n 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 standard covers the requirements of expanded elastomeric rubber seals attached to a solid carrier used in
3、sealing body openings. 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 expanded closed-cell ethylene propylene diene monomer (EPDM). For attachment purposes, weatherstrips require a dense base (car
4、rier). This carrier shall be coextruded with the expanded cellular bulb. The carrier shall incorporate a metal insert if specified on the respective part drawing. The specifications for the dense base and the metal carrier shall be specified on the engineering part drawing or in the math data file.
5、Weatherstrip assemblies shall consist of continuous extruded sections or sections joined together. These sections shall be joined by either transfer or injection molded corners, or mitered corners securely attached with suitable adhesive. Joint and corner offsets in visible and sealed areas must be
6、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 applications include the following:
7、 sealing profiles in the body area, e.g., on doors, tailgates, and trunk lids. 2 References Note: Only the latest approved standards are applicable unless otherwise specified. 2.1 External Standards/Specifications. AATCC 23 ISO 3865 ISO 105-B06 ISO 7500-1 ISO 105-G02 ISO 9513 ISO 188 ISO 23529 ISO 1
8、431-1 2.2 GM Standards/Specifications. GM9842P GMW14685 GM9843P GMW14711 GMW3001 GMW14712 GMW3059 GMW14757 GMW14125 GMW15379 GMW14162 GMW15381 GMW14170 GMW15382 GMW14294 GMW15564 GMW14650 GMW15681 3 Test Preparation and Evaluation 3.1 Resources. 3.1.1 Calibration. The test facilities and equipment s
9、hall be in good working order 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 Fac
10、ilities Facilities shall conform 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
11、 test machine shall correspond 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. Unless otherwise specified, the shape, size and number of tes
12、t pieces shall be in accordance with the relevant Test Procedure. For Design and Product Validation, test pieces shall be cut from at least GMW14147 GM WORLDWIDE ENGINEERING STANDARDS Copyright 2008 General Motors Corporation All Rights Reserved Page 2 of 9 April 2008 three finished parts, for Routi
13、ne Quality Control from at least one finished part. The number of test pieces required is defined in Appendix B, Table B1 3.2 Preparation. Not applicable. 3.3 Conditions. 3.3.1 Environmental Conditions. The minimum time between vulcanization and testing of elastomers shall be 72 h. The test pieces s
14、hall 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. 3.4 Instructions. Not applicable. 3.5 Data. Not applicable. 3.6 Safety. This standard may involve hazardous materials, operations, and equipment. This standard does not propo
15、se 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 limitations prior to use. 3.7 Documentation. Samples of components or material relea
16、sed 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., design, function, properties, manufactur
17、ing 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 new release. If not otherwise agreed to, t
18、he 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 Results. With reference to this specification t
19、he 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, test certificates, reports, etc. 3.8 Dimensions and Tolerances. Dimensi
20、ons 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 and Procedure 4.1 Appearance. The surface of both the extruded and molde
21、d sections shall have a natural skin. 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
22、as specified 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 hidden, either by coating or overmolding. Molded joint offsets in visible areas and on se
23、al surfaces must be no greater than 0.25 mm. 4.2 Performance Requirements. If a seal consists of several sections the specified tests shall be conducted on each section. Unless otherwise stated, the tests and evaluations shall be performed at the temperature of 23 5C, see Appendix A. 5 Provisions fo
24、r Shipping 5.1 Approved Sources. Engineering qualifications of an approved source is required for this specification. Only sources listed in the GM Materials File (e.g., MATSPC) under this specification number have been qualified by engineering as meeting the requirements of this specification. For
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