1、 ENGINEERING MATERIAL SPECIFICATIONDate Action Revisions Ver 12008 04 22 Activated A. Wedepohl Printed copies are uncontrolled Copyright 2008, Ford Global Technologies, LLC Page 1 of 4 HYDROGENATED NITRILE (HNBR) RUBBER WSS-M2D451-B1 80 DUROMETER HYDROGENATED NITRILE (HNBR) RUBBER WSS-M2D451-B2 70 D
2、UROMETER 1. SCOPE The material defined by these specifications is a hydrogenated nitrile butadiene (HNBR) rubber formulated for resistance to heat, power steering, or automatic transmission fluid. 2. APPLICATION These specifications were released originally for o-rings on hydraulic distribution line
3、s which are in contact with power steering fluid at elevated temperatures. 3. REQUIREMENTS 3.1 STANDARD REQUIREMENTS FOR PRODUCTION MATERIALS Material suppliers and part producers must conform to the Companys Standard Requirements for Production Materials (WSS-M99P1111-A). 3.2 MATERIAL TESTING Prepa
4、ration of Test Specimens 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 recommended dimensions of the test sheet
5、s are: 150 x 150 mm, min x 2.0 +/- 0.2 mm. 3.3 ORIGINAL PROPERTIES 3.3.1 Hardness, Durometer A B1 80 +/- 5 (ISO 868/ASTM D 2240, instantaneous, B2 70 +/- 5 plied-up specimen. Hand held durometers shall not be used) 3.3.2 Tensile Strength, min 15 MPa (ISO 37/ASTM D 412, Die C) 3.3.3 Elongation at Bre
6、ak, min 150% (ISO 37/ASTM D 412, Die C) 3.3.4 Modulus at 100% Elongation 5.0 MPa (ISO 37/ASTM D 412, Die C) ENGINEERING MATERIAL SPECIFICATIONWSS-M2D451-B1/B2 Printed copies are uncontrolled Copyright 2008, Ford Global Technologies, LLC Page 2 of 4 3.3.5 Retraction at Low Temperatures (ASTM D 1329,
7、Initial Extension = half the ultimate) 3.3.5.1 TR10 -30 to -12 C 3.3.5.2 TR70 -12 to 0 C 3.3.6 Ozone Resistance, max Rating 0 (FLTM BP 101-01, Procedure A) 3.3.7 Compression Set, max 45% (ISO 815/ASTM D 395, Method B, except 25% compression, plied-up specimens, 70 h at 150 +/- 2 C) 3.4 HEAT AGED (IS
8、O 188/ASTM D 573, 150 +/- 50 air changes/h, 168 h at 150 +/- 2 C) 3.4.1 Hardness Change 0 to +12 3.4.2 Tensile Strength Change, max +/- 25% 3.4.3 Elongation Change, max 0 to -30% 3.4.4 Visual Evaluation No surface tackiness or cracks when folded flat against itself. 3.5 HEAT AGED (ISO 188/ASTM D 573
9、, 150 +/- 50 air changes/h, 1000 h at 150 +/- 2 C) 3.5.1 Hardness Change 0 to +20 3.5.2 Tensile Strength Change, max +/- 25% 3.5.3 Elongation Change, max 0 to -85% 3.5.4 Visual Evaluation No surface tackiness or cracks when folded flat against itself. ENGINEERING MATERIAL SPECIFICATIONWSS-M2D451-B1/
10、B2 Printed copies are uncontrolled Copyright 2008, Ford Global Technologies, LLC Page 3 of 4 3.6 IMMERSION IN OIL, IRM 901 (ISO 1817/ASTM D 471, 168 h at 150 +/- 2 C) 3.6.1 Hardness Change +/- 10 3.6.2 Tensile Strength Change, max +/- 25% 3.6.3 Elongation Change, max +/- 25% 3.6.4 Volume Change -10
11、to +10% 3.6.5 Visual Evaluation No surface tackiness or cracks when folded flat against itself. 3.7 IMMERSION IN OIL, IRM 903 (ISO 1817/ASTM D 471, 168 h at 150 +/- 2 C) 3.7.1 Hardness Change +/- 20 3.7.2 Tensile Strength Change, max +/- 30% 3.7.3 Elongation Change, max +/- 30% 3.7.4 Volume Change 0
12、 to 25% 3.7.5 Visual Evaluation No surface tackiness or cracks when folded flat against itself. 3.8 IMMERSION IN FORD POWER STEERING FLUID (ISO 1819/ASTM D 412, 168 h at 150 +/- 2 C) At the time this specification was released, there were three power steering fluids. To meet the requirements of this
13、 specification, the rubber must be tested in one of the three fluids. The outcomes can be compared to the values listed in Table 1 of section 4.0. Table 1 can be used for quality control purposes, but does not define the material performance necessary to insure component function. 3.8.1 Identify flu
14、id used Report 3.8.2 Hardness Change Report 3.8.3 Tensile Strength Change, max Report 3.8.4 Elongation Change, max Report 3.8.5 Volume Change Report 3.8.6 Visual Evaluation No surface tackiness or cracks when folded flat against itself. ENGINEERING MATERIAL SPECIFICATIONWSS-M2D451-B1/B2 Printed copi
15、es are uncontrolled Copyright 2008, Ford Global Technologies, LLC Page 4 of 4 4. GENERAL INFORMATION The information given below is provided for clarification and assistance in meeting the requirements of these specifications. 4.1 At the time this specification was released, there were three power s
16、teering fluids. The initial fill fluid was about to transition to a new fluid and there was a third fluid released for service. 1. WSA-M2C195-A, Imperial Oil FN1982, previously Exxon FN1982, 2. WSS-M2C938-A, ConocoPhillips ATF-94-A. Type A Transmission fluid 3. MERCON V Automatic Transmission Fluid
17、and Premium Power Steering Fluid Table 1 REFERENCE DATA FOR IMMERSION IN FORD STEERING FLUID (ISO 1819/ASTM D 412, 168 h at 150 +/- 2 C) FN 1982 WSA-M2C195-A Type A WSS-M2C938-A MERCON V Hardness Change 0 to -10 +/- 5 +/ 5 Tensile Strength Change, max +/- 12% +/- 30% -20 to +30% Elongation Change, m
18、ax -20 to -10% -45 to +10% -35 to -8% Volume Change 2 to +10% -2 to +7% 0 to +7% Visual Change Pass Pass Pass 4.2 INSERTION EFFORTS For assembly of the power steering lines into the gear, a low friction coating is typically recommend to decrease insertion forces. Two coatings currently used for this
19、 application. 1. Parkerslick NON-PTFE Coating., (P10 for WHITE, P06 for ORANGE) 2. MLUBE 1800 per WSS-M99B191-A (PTFE) 5. SUMMARY OF REVISIONS 2008 04 22 Was previously WSA-M2D451-A2. Added 70 Durometer in support of the corporate clamp plate project which standardized the fitting dimensions for the high and low pressure line attachment to the steering gear. Changed some of the specification limits to agree with material currently in production.
