1、 ENGINEERING MATERIAL SPECIFICATIONDate Action Revisions 2010 06 25 N-STATUS No replacement named C. Mracna, NA 2004 07 22 Revised Para 3.0 inserted; para 3.8, 3.9 & 4 deleted 1984 10 12 Released PCR-891112-P50 Printed copies are uncontrolled Copyright 2010, Ford Global Technologies, LLC Page 1 of 2
2、 POLYACRYLIC RUBBER, HIGH TEMPERATURE - ESP-M2D254-A2 OIL SEAL NOT TO BE USED FOR NEW DESIGN 1. SCOPE The polyacrylic material defined by this specification has good high temperature properties. 2. APPLICATION This specification was released originally for material used in transmission oil seals. 3.
3、 REQUIREMENTS These tests are to be conducted on ASTM slabs and buttons and/or actual seals. 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). 3.1 ORIGINAL PROPERTIES
4、Tensile Strength, min 9.7 MPa (ASTM D 412 & para 5.3) Elongation, min 100% Hardness - Micro 70 - 80 IRHD (ASTM D 1415) 3.2 HEAT AGING (ASTM D 573, 70 h at 175 +/- 3 C) Volume Change -3 to 0% Hardness Change, max +15 IRHD Tensile Strength Change, max -45% 3.3 IMMERSION IN ASTM OIL NO. 1 (ASTM D 471,
5、aluminum block, 70 h at 150 +/- 1 C) Volume Change +/- 3% Hardness Change, max +5 IRHD Tensile Strength Change, max -5% 3.4 IMMERSION IN ASTM OIL NO. 3 (ASTM D 471, aluminum block, 70 h at 150 +/- 1 C) Volume Change, max +30% Hardness Change, max -25 IRHD Tensile Strength Change, max -30% ENGINEERIN
6、G MATERIAL SPECIFICATIONESP-M2D254-A2 Printed copies are uncontrolled Copyright 2010, Ford Global Technologies, LLC Page 2 of 2 3.5 IMMERSION IN TWO APPROVED ATFS, EACH CONTAINING A DIFFERENT ADDITIVE PACKAGE (ASTM D 471, aluminum block, 168 h at 163 +/- 3 C) Volume Change, max +12% Hardness Change
7、+/- 10 IRHD Tensile Strength Change -35 to +10% 3.6 MODULUS OF ELASTICITY AT -18 C 210,000 psi (ASTM D 1053, see para 5.1) (1.45 GPa) 3.7 COMPRESSION SET, max 3.7.1 Slab Stock 55% (ASTM D 395, Method “B“, plied, 70 h at 167 +/- 1 C) 3.7.2 Seals (see para 5.2) 45% (ASTM D 1414, Method “B“, 70 h at 15
8、0 +/- 1 C) 5. GENERAL INFORMATION The information given below is provided for clarification and assistance in meeting the requirements of this specification. 5.1 Test procedure will qualify the actual seals for use at -40 C. 5.2 When actual seal is an “O“ ring or other non-rectangular cross section 60% compression set is acceptable. 5.3 Use a 90 mm long seal segment and pull at 255 mm/min for tensile strength. 5.4 When ASTM slabs are tested, durometer “A“ hardness (ASTM D 2240) may be used in place of microhardness (ASTM D 1415).
