1、 ENGINEERING MATERIAL SPECIFICATION Date Action Revisions Ver 5 2008 06 24 N-STATUS Replaced by WSS-M2D451-B1 A. Wedepohl, FNA 2004 09 27 Revised Inserted 3.0; Deleted 3.1, 3.2, 3.3 3.11, 3.12 & 4 1991 12 12 Released (DQ) NC00E10141547002 A.N. Novakovic Printed copies are uncontrolled Copyright 2008
2、 Ford Global Technologies, LLC Page 1 of 3 HYDROGENATED NITRILE (HNBR) RUBBER WSA-M2D451-A2 NOT TO BE USED FOR NEW DESIGN 1. SCOPE The material defined by this specification is a hydrogenated nitrile butadiene (HNBR) rubber formulated for resistance to heat and power steering fluid. 2. APPLICATION
3、This specification was released originally for material used in oil seals which come in contact with power steering fluid at elevated temperatures. 3. REQUIREMENTS 3.0 STANDARD REQUIREMENTS FOR PRODUCTION MATERIALS Material suppliers and part producers must conform to the Companys Standard Requireme
4、nts For Production Materials (WSS-M99P1111-A). 3.4 MATERIAL TESTING 3.4.1 Preparation 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 cur
5、e to molded parts are recommended. The test sheets shall have the following dimensions: 150 x 150 mm, min x 2.0 +/- 0.2 mm 3.5 ORIGINAL PROPERTIES 3.5.1 Density 1.15 - 1.30 g/cm3 (ISO 1183, Method A/ASTM D 297) 3.5.2 Hardness, Durometer A 75 - 85 (ISO 868/ASTM D 2240, instantaneous, plied-up specime
6、n. Hand held durometers shall not be used) 3.5.3 Tensile Strength, min 15 MPa (ISO 37/ASTM D 412, Die C) 3.5.4 Elongation at Break, min 150% (Test Method according to para 3.5.3) ENGINEERING MATERIAL SPECIFICATION WSA-M2D451-A2 Printed copies are uncontrolled Copyright 2008, Ford Global Technologies
7、 LLC Page 2 of 3 3.5.5 Modulus at 100% Elongation 5.5 MPa (Test Method according to para 3.5.3) 3.5.6 Brittleness Point, max -35 C (ISO 812, Type B specimen/ ASTM D 2137, Method A) 3.5.7 Ozone Resistance, max Rating 0 (FLTM BP 101-01, Procedure A) 3.5.8 Compression Set, max 45% (ISO 815/ASTM D 395,
8、 Method B, except 25% compression, plied-up specimens, 70 h at 150 +/- 2 C) 3.6 HEAT AGED (ISO 188/ASTM D 573, 150 +/- 50 air changes/h, 168 h at 150 +/- 2 C) 3.6.1 Hardness Change 0 to +12 3.6.2 Tensile Strength Change, max +/- 15% 3.6.3 Elongation Change, max 0 to -30% 3.6.4 Visual Evaluation No s
9、urface tackiness or cracks when folded flat against itself. 3.7 HEAT AGED (ISO 188/ASTM D 573, 150 +/- 50 air changes/h, 1000 h at 150 +/- 2 C) 3.7.1 Hardness Change 0 to +20 3.7.2 Tensile Strength Change, max +/- 25% 3.7.3 Elongation Change, max 0 to -75% 3.7.4 Visual Evaluation No surface tackines
10、s or cracks when folded flat against itself. 3.8 IMMERSION IN OIL NO.1 (ISO 1817/ASTM D 471, 168 h at 150 +/- 2 C) 3.8.1 Hardness Change +/- 10 3.8.2 Tensile Strength Change, max +/- 25% 3.8.3 Elongation Change, max +/- 35% ENGINEERING MATERIAL SPECIFICATION WSA-M2D451-A2 Printed copies are uncontro
11、lled Copyright 2008, Ford Global Technologies, LLC Page 3 of 3 3.8.4 Volume Change -10 to +20% 3.8.5 Visual Evaluation No surface tackiness or cracks when folded flat against itself. 3.9 IMMERSION IN OIL NO.3 (ISO 1817/ASTM D 471, 168 h at 150 +/- 2 C) 3.9.1 Hardness Change +/- 15 3.9.2 Tensile Stre
12、ngth Change, max +/- 25% 3.9.3 Elongation Change, max +/- 35% 3.9.4 Volume Change 0 to 25% 3.9.5 Visual Evaluation No surface tackiness or cracks when folded flat against itself. 3.10 IMMERSION IN FORD RELEASED POWER STEERING FLUID (ISO 1819/ASTM D 412, 168 h at 150 +/- 2 C, see para 5.1) 3.10.1 Har
13、dness Change +/- 10 3.10.2 Tensile Strength Change, max +/- 20% 3.10.3 Elongation Change, max +/- 20% 3.10.4 Volume Change 0 to +10% 3.10.5 Visual Evaluation No surface tackiness or cracks when folded flat against itself. 5. GENERAL INFORMATION The information below is provided for clarification and
14、 assistance in meeting the requirements of this specification. 5.1 For information on currently approved service fluids and other materials required for use in this specification contact: Materials Laboratory 15/GM-D01-D Chassis Engineering Research and Engineering Centre Materials and Corrosion Ford Motor Company Ltd Ford Motor Company Laindon, Basildon P.O. Box 2053 Essex SS15 6EE, England Building #5, Room 201 Dearborn, MI 48124 (313) 323-8658 Materials Engineering Product Engineering Office Ford Motor Co. of Australia Ltd Princes Highway, Norlane Victoria 3214, Australia
