1、 ENGINEERING MATERIAL SPECIFICATIONDate Action Revisions 2004 06 23 Revised Para 3.0 inserted; para 3.1, 3.2, 3.3, 3.7 & 4 deleted 1996 03 25 Revised Deleted para 3.5.1, renumbered E. Duda1995 06 27 Activated NE01-E-10127076-160 E. DudaPrinted copies are uncontrolled Copyright 2004, Ford Global Tech
2、nologies, LLC Page 1 of 2 SILICONE RUBBER, HIGH TEAR-HIGH TEMPERATURE WSS-M2D8-B2 1. SCOPE The material defined by this specification is a high temperature and high tear silicone rubber. 2. APPLICATION This specification was released originally for material used as a molded spark plug insulator for
3、vehicles requiring a high temperature material. 3. REQUIREMENTS 3.0 STANDARD REQUIREMENTS FOR PRODUCTION MATERIALS Material suppliers and part producers must conform to the Companys Standard Requirements For Production Materials (WSS-M99P1111-A). 3.4 MATERIAL TESTING 3.4.1 SLAB STOCK (150 x 150 x 1.
4、90 +/- 0.13 mm) Whenever possible, all test specimens shall be die-cut from the finished parts. When not feasible, specimens cut from molded test sheets manufactured from the same material and with equivalent cure to molded parts are recommended. The test sheets shall have the following dimensions:
5、3.5 ORIGINAL PROPERTIES 3.5.1 Tensile Strength, min 2.4 MPa (ISO 37/ASTM D 412, Die C) Elongation, min 280% 3.5.2 Hardness, Durometer A 55 - 65 (ISO 868/ASTM D 2240, instantaneous, plied-up specimen. Hand held durometers shall not be used) 3.5.3 Heat Aged (ISO 188/ASTM D 573, 70 h at 230 +/- 2 C) Te
6、nsile Strength Change, max -10% Elongation Change, max -65% Hardness, Durometer A Change -2 to + 15 ENGINEERING MATERIAL SPECIFICATIONWSS-M2D8-B2Printed copies are uncontrolled Copyright 2004, Ford Global Technologies, LLC Page 2 of 2 3.5.4 Immersion in ASTM Oil No. 1 (ISO 1817/ASTM D 471, 70 h at 1
7、50 +/- 2 C) Tensile Strength Change, max -22% Elongation Change, max -25% Hardness, Durometer A Change -10 to 0 Volume Change, max + 10% 3.5.5 Immersion in Oil IRM 903 (ISO 1817/ASTM D 471, 70 h at 150 +/- 2 C) Tensile Strength Change, max -30% Elongation Change, max -25% Hardness, Durometer A Chang
8、e -28 to 0 Volume Change, max + 38% 3.5.6 Compression Set, max 65% (ISO 815/ASTM D 395, Method B, plied-up specimens, 70 h at 177 +/- 2 C) 3.5.7 Cold Flexibility No cracking Test Method: After 70 h at -40 C material is bent 180 C over 12.7 mm mandrel. 3.5.8 Tear Strength, min 14 kN/m (ISO 34, Method
9、 B, procedure (a)/ ASTM D 624, Die B) 3.5.9 Dielectric Strength, min 20 kV/mm (IEC 243/ASTM D 149 in insulating oil) 3.5.10 Ozone Resistance, max (FLTM BP 101-01, Procedure A) No checking or cracking after 72 h at 38 +/- 1 C at an ozone concentration of 50 +/- 5 parts per 100 million parts of air. 3
10、6 ADDITIONAL REQUIREMENTS Specific requirements for material and/or manufactured parts shall be specified on the Engineering drawing, Engineering parts specification and/or performance specification. All critical areas with respect to these properties shall be clearly designated on the engineering drawing.
