1、 ENGINEERING MATERIAL SPECIFICATIONDate Action Revisions 2009 08 20 N-STATUS No Replacement Named C. Mracna, NA 2004 07 22 Revised Para 3.0 inserted; para 3.4 & 4 deleted 1975 09 23 Released CW10-711085 Printed copies are uncontrolled Copyright 2009, Ford Global Technologies, LLC Page 1 of 3 NITRILE
2、 BUTADIENE RUBBER, LOW TEMPERATURE ESW-M2D250-A RESISTANT - OIL SEAL NOT TO BE USED FOR NEW DESIGN 1. SCOPE The material defined by this specification is a nitrile butadiene rubber compounded specifically for low temperature resistance, without sacrificing other desirable properties. 2. APPLICATION
3、This specification was released originally for material used in power steering sector shaft seals. 3. REQUIREMENTS Testing frequency for each requirement shall be an agreement between supplier quality assurance, supplier, and affected design and materials engineering group. 3.0 STANDARD REQUIREMENTS
4、 FOR PRODUCTION MATERIALS Material suppliers and part producers must conform to the Companys Standard Requirements For Production Materials (WSS-M99P1111-A). 3.1 RAW MATERIAL 3.1.1 Oscillating Disk Rheometer (ASTM D 2084) The compound must have a curve that corresponds to the master curve of the mat
5、erial approved for use that is on file in the Suppliers Quality Control Office and the affected product engineering materials office. Utilizing the established operating parameters, the following ranges must be maintained. ML - minimum torque +/- 3.5 lb in (+/- 0.4 N.m) MHF- maximum torque +/- 12.0
6、lb in (+/- 1.4 N.m) tS2- scorch time for 2 lb in +/- 1.0 min (0.2 N.m) rise above minimum torque 3.2 PART 3.2.1 Specific Gravity 1.23 - 1.29 (ASTM D 792) 3.2.2 Hardness, Micro 75 - 85 IRHD (ASTM D 1415) ENGINEERING MATERIAL SPECIFICATIONESW-M2D250-A Printed copies are uncontrolled Copyright 2009, Fo
7、rd Global Technologies, LLC Page 2 of 3 3.2.3 Thermal Analysis and Pyrolytic Gas Chromatography Ford Motor Company, at its option, may conduct pyrolytic gas chromatography and thermogravimetric and differential thermal analysis of materials/parts supplied to this specification. The curves establishe
8、d for initial approval shall constitute the reference standard and shall be kept on file at Central Laboratory. All samples shall produce curves that correspond to the reference standard when tested under the same conditions as those specified on the master curve. 3.2.4 Any additional requirements a
9、pplicable to specific parts shall be specified on the engineering drawings or in a separate engineering specification identified on the drawing. 3.3 INITIAL QUALIFICATION These tests are to be conducted on slab stock by all material suppliers prior to source approval and at least once every 6 months
10、 3.3.1 Original Properties Hardness, Durometer “A“ 75 - 85 (ASTM D 2240) Tensile Strength, min 2,000 psi (ASTM D 412, Die “C“) (13.8 MPa) Elongation, min 140% (ASTM D 412, Die “C“) Modulus at 100% Elongation, min 1,000 psi (ASTM D 412, Die “C“) (6.9 MPa) 3.3.2 Heat Aged (ASTM D 865, aluminum block,
11、 70 h at 125 +/- 2 C) Hardness, Durometer “A“ 0 to +10 Tensile Strength Change, max -20% Elongation Change, max -50% 3.3.3 Immersion in ASTM Oil #3 (ASTM D 471, aluminum block 70 h at 150 +/- 2 C) Hardness, Durometer “A“ Change -25 to 0 Tensile Strength Change, max -30% Elongation Change, max -35% V
12、olume Change 0 to +30% ENGINEERING MATERIAL SPECIFICATIONESW-M2D250-A Printed copies are uncontrolled Copyright 2009, Ford Global Technologies, LLC Page 3 of 3 3.3.4 Immersion in ASTM Oil #1 (ASTM D 471, aluminum block, 70 h at 150 +/- 2 C) Hardness, Durometer “A“ Change 0 to +10 Tensile Strength Ch
13、ange, max -35% Elongation Change, max -45% Volume Change -7 to 0% 3.3.5 Immersion in Automatic Transmission Fluid, ESP-M2C138-CJ (ASTM D 471, aluminum block, 70 h at 150 +/- 2 C) Hardness, Durometer “A“ Change -15 to 0 Tensile Strength Change, max -55% Elongation Change, max -60% Volume Change 0 to +15% 3.3.6 Low Temperature Brittleness Pass (ASTM D 746, Procedure “B“, Nonbrittle after 3 min at -40 C) 3.3.7 Compression Set, max 60% (ASTM D 397, Method “B“, Plied, 70 h at 135 +/- 2 C)
