1、 ENGINEERING MATERIAL SPECIFICATIONDate Action Revisions 2009 08 21 N-STATUS No Replacement Named C. Mracna, NA 2004 07 22 Revised Para 3.0 inserted; para 3.5 & 4 deleted 1976 01 19 Released CW10-711056-S1 Printed copies are uncontrolled Copyright 2009, Ford Global Technologies, LLC Page 1 of 3 NITR
2、ILE BUTADIENE RUBBER, CONTROLLED SWELL - ESW-M2D261-A 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 controlled volume swell, without sacrificing other desirable properties. 2. APPLICATION This spec
3、ification was released originally for material used in power steering pump reservoir “O“ ring seals. 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).
4、3.1 RAW MATERIAL 3.1.1 Oscillating Disk Rheometer or Shearing Disk Viscometer (ASTM D 2084 or ASTM D 1646 respectively) The compound must have a curve or viscosity and scorch data that corresponds to original material approved for use that is on file in the suppliers quality control office and the a
5、ffected product engineering materials office. Utilizing the established operating parameters, the following ranges must be maintained. Rheometer: ML- Minimum Torque +/- 3.5 lb-in (+/- 0.4 N-m) MHF- Maximum Torque +/- 3.5 lb-in (+/- 0.4 N-m) tS2- Scorch Time for 2 lb-in (0.2 N-m) +/- 30 s Rise Above
6、Minimum Torque Viscometer: Minimum Viscosity (Mooney) +/- 8 t2.5- Scorch Time +/- 30 s 3.2 PART 3.2.1 Specific Gravity +/- 0.03 (ASTM D 792) Each supplier must establish values for their compound prior to source approval and be able to maintain these values within the given tolerance. ENGINEERING MA
7、TERIAL SPECIFICATIONESW-M2D261-A Printed copies are uncontrolled Copyright 2009, Ford Global Technologies, LLC Page 2 of 3 3.2.2 Hardness - Micro 65 - 75 IRHD (ASTM D 1415) 3.2.3 Thermal Analysis and Pyrolytic Chromatography Ford Motor Company, at its option, may conduct pyrolytic gas chromatography
8、, thermogravimetric analysis and differential thermal analysis of material/parts supplied to this specification. The curves established 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 th
9、e reference standard when tested under the same conditions as those specified on the master curve. 3.2.4 Additional Requirements Any additional requirements applicable to specific parts shall be specified on the engineering drawing or in a separate engineering specification identified on the drawing
10、. 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. 3.3.1 Original Properties Hardness - Durometer “A“ 65 - 75 (ASTM D 2240) Tensile Strength, min 1,500 psi (ASTM D 412, Die “C“) (10.3 MPa) Elo
11、ngation, min 200% (ASTM D 412, Die “C“) Modulus at 100% Elongation, min 450 psi (ASTM D 412, Die “C“) (3.1 MPa) 3.3.2 Heat Aged (ASTM D 865, aluminum block, 70 h at 125 +/- 2 C) Hardness - Durometer “A“ Change 0 to +10 Tensile Strength Change, max -25% Elongation Change, max -45% 3.3.3 Immersion in
12、ASTM No. 1 Oil (ASTM D 471, aluminum block, 168 h at 150 +/- 2 C) Hardness - Durometer “A“ Change +/- 10 Tensile Strength Change, max -45% Elongation Change, max -35% Volume Change 0 to +15% ENGINEERING MATERIAL SPECIFICATIONESW-M2D261-A Printed copies are uncontrolled Copyright 2009, Ford Global Te
13、chnologies, LLC Page 3 of 3 3.3.4 Immersion in ASTM No. 3 Oil (ASTM D 471, aluminum block, 168 h at 150 +/- 2 C) Hardness - Durometer “A“ Change -15 to -25 Tensile Strength Change, max -70% Elongation Change, max -60% Volume Change 45 to 65% 3.3.5 Immersion in Automatic Transmission Fluid, ESP-M2C13
14、8-CJ (ASTM D 471, aluminum block, 168 h at 150 +/- 2 C) Hardness - Durometer “A“ Change -10 to -20 Tensile Strength Change, max -70% Elongation Change, max -60% Volume Change +20 to +45% 3.3.6 Low Temperature Brittleness Pass (ASTM D 746, Method “B“, nonbrittle after 3 min at -40 C) 3.3.7 Compressio
15、n Set, max 40% (ASTM D 395, Method “B“, plied, 70 h at 125 +/- 2 C) 3.4 ACCEPTANCE Each batch of compounded material must be tested in accordance to Para 3.1.1 (Oscillating Disk Rheometer or Shearing Disk Viscometer). Minimum of 3 samples per lot (8 h production maximum) must be tested after vulcanization prior to secondary operations in accordance to Para 3.2.1 and 3.2.2 (Specific Gravity and Hardness). A sampling pattern shall be established so that samples tested will vary and represent each part in a multi-cavity system.
