GMNA-GM6400MR-1997.pdf
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1、I GENERAL MOTORS ENGINEERING STANDARDS I Materials and Processes - General I RUBBER - MASTICATED, RECYCLED, MOLDED SHEET STOCK GM5400MR 1 SCOPE. This specification covers a combination of rubber and fiber mixed in sheet form. 1.1 This material may be used as an insert material in the wheel well open
2、ing or as a barrier for road debris in the engine compartment areas where service temperatures do not exceed 70C. Typical applications include wheelhouse splash guards, fuel tank cushion blocks or spacers, and air baffles. Exterior Applications Only. 1.2 This material has minimal oil and fuel resist
3、ance. 1.3 RECYCLED MATERIALS. Materials under this specifi- cation shall have a minimum 25% recycled content by weight as defined by GM502M. Post Consumer and/or Post Industrial Materials apply. 2 REFERENCED STANDARDS. GM502M ASTM D412 ASTM D925 GMlOOOM ASTM D573 ASTM D2240 GM9902P ASTM D624 SAE 513
4、51 3 MATERIAL REQUIREMENTS. See Table 1. 3.1 Unless otherwise specified, the material shall be tested under standard conditions, 21 rt 2 C and 50 + 5% RH. 3.2 COMPOSlTION. Masticated black compound consisting primarily of nylon, polyester and reinforced rubber. Contains 25% minimum post consumer rec
5、yclate from used tires. 3.3 OZONE RESISTANCE. After 70 h 38C in 100 pphm ozone concentration, the minimum tear strength across the grain shall be 15 kN/m. Also, there shall be no cracks when viewed under 2X magnification. 3.4 ODOR TESTING. Test according to SAE 51351. Maximum rating level is 3. (Def
6、inite odor, but not strong enough to be offensive) 3.5 PAINT STAIN TESTING. Test according to GM9902P and ASTM D925, Method B. Delta b shall not exceed 4.0 when tested to GM9902P. No migration staining will be evi- dent when tested to ASTM D925, Method B. 3.6 RESTRICTED AND REPORTABLE CHEMICALS (GMl
7、OOOM). All materials supplied to this specification must comply with the requirements listed in GMlOOOM, “Restricted and Reportable Chemicals.” Properties Tensile Strength TABLE 1 Q-PI Typen Test Methods ASTM D412 Method A, Die c, 500 mm/nlinute 0 Cqyight JUNE 1997 Gemrd Motors Corporation AJI Right
8、s Ressrved 0.7 MPa min 0.5 MPa min ASTM D412 Method A. Die c, 500 mm/lnin 59.8 49.5 ASTM D624, Die B 11.5 kN/m min 9.3 kN/m min 55 - 66 ASTM D2240 Shore A ASTM D573 70 h 7o”C, Die C 17 25 +8.3 4.2 TYPE II. This is a flexible recycled masticated rubber that can be used for thickness from 1 mm to part
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