1、 ENGINEERING MATERIAL SPECIFICATIONDate Action Revisions 2009 08 21 N-STATUS No Replacement Named C. Mracna, NA 2004 07 16 Revised Para 3.0 inserted; para 3.3, 3.5 & 4 deleted 1977 03 31 Released #197/CAF8-RD-560196 Printed copies are uncontrolled Copyright 2009, Ford Global Technologies, LLC Page 1
2、 of 3 SEAL, NITRILE BUTADIENE RUBBER - REFRIGERANT ESH-M2D272-A AND OIL RESISTANT NOT TO BE USED FOR NEW DESIGN 1. SCOPE The material defined by this specification is a nitrile butadiene rubber having restricted modulus and compression set and good resistance to refrigerant and compressor oil. 2. AP
3、PLICATION This specification was released originally for material used to mold “O“ rings used as seals in the air conditioning system. 3. REQUIREMENTS 3.0 STANDARD REQUIREMENTS FOR PRODUCTION MATERIALS Material suppliers and part producers must conform to the Companys Standard Requirements For Produ
4、ction Materials (WSS-M99P1111-A). 3.1 SLAB STOCK 3.1.1 Original Properties Hardness - Durometer “A“ 65 - 75 (ASTM D 2240) Tensile Strength, min 1,800 psi (ASTM D 412) (12.4 MPa) Ultimate Elongation, min 200% (ASTM D 412) Modulus at 100% Elongation, min 450 psi (ASTM D 412) (3.1 MPa) 3.1.2 Heat Aged
5、(ASTM D 865, 70 h at 125 +/- 1 C) Hardness - Durometer “A“ Change 0 to +10 Tensile Strength Change +/- 15% Elongation Change 0 to -50% 3.1.3 Compression Set, max 35% (ASTM D 395, Method “B“, plied, 70 h at 125 +/- 1 C) ENGINEERING MATERIAL SPECIFICATIONESH-M2D272-APrinted copies are uncontrolled Cop
6、yright 2009, Ford Global Technologies, LLC Page 2 of 3 3.1.4 Immersion in ASTM No. 1 Oil (ASTM D 471, 70 h at 150 +/- 3 C) Hardness - Durometer “A“ Change -5 to +8 Tensile Strength Change -15 to +25% Elongation Change -40% Volume Change +/- 5% 3.1.5 Immersion in ASTM No. 3 Oil (ASTM D 471, 70 h at 1
7、50 +/- 3 C) Hardness - Durometer “A“ Change -15 to 0 Tensile Strength Change +/- 30% Elongation Change 0 to -40% Volume Change 0 to +18% 3.1.6 Low Temperature Brittleness Must pass (ASTM D 746, -29 C) 3.2 FINISHED PART (ASTM D 1414) 3.2.1 Original Properties Hardness - Micro 62 - 72 IRHD (ASTM D 141
8、5) Tensile Strength, min 1,500 psi (10.3 MPa) Ultimate Elongation, min 200% Modulus at 100% Elongation, min 400 psi (2.8 MPa) 3.2.2 Heat Aged (70 h at 125 +/- 3 C) Hardness Change 0 to +15 IRHD Tensile Strength Change +/- 20% Elongation Change, max -50% 3.2.3 Compression Set, max (70 h at 125 +/- 3
9、C) 0.060 - 0.075 in (1.52 - 1.91 mm) 65% 0.076 - 0.105 in (1.93 - 2.67 mm) 60% 0.106 - 0.150 in (2.69 - 3.81 mm) 55% ENGINEERING MATERIAL SPECIFICATIONESH-M2D272-APrinted copies are uncontrolled Copyright 2009, Ford Global Technologies, LLC Page 3 of 3 3.2.4 Immersion in ASTM No. 1 Oil (70 h at 150
10、+/- 3 C) Hardness Change -2 to +10 IRHD Tensile Strength Change +/- 25% Elongation Change 0 to -40% Volume Change +/- 5% 3.2.5 Immersion in ASTM No. 3 Oil (70 h at 150 +/- 3 C) Hardness Change -15 to 0 IRHD Tensile Strength Change -30 to +10% Elongation Change -40 to +20% Volume Change 0 to +20% 3.2
11、.6 Low Temperature Brittleness Must pass (5 h at -40 C, figure 8 bend) 3.4 SURFACE FINISH The “O“ ring shall be very smooth and the sealing surfaces shall be free from mold tool marks, loose mold flash, trimming nicks, blemishes or irregularities and imperfections. The sealing surfaces shall be free of obvious surface contaminants such as bloom, talc or mold release. All tooling used in molding these parts shall be of at least “commercial quality“ as defined by RMA.
