1、 ENGINEERING MATERIAL SPECIFICATIONDate Action Revisions 2009 09 17 N-STATUS Use industry standard C. Mracna, NA 2005 01 25 Revised Removed Inactive A1; Inserted 3.0; Deleted 3.1, 3.2, 3.3, 3.10, 3.11, 4 1990 03 30 Released C10067638 B. Hennessey Printed copies are uncontrolled Copyright 2009, Ford
2、Global Technologies, LLC Page 1 of 3 RUBBER, POLYCHLOROPRENE (CR) WSD-M2D420-A2 LOW TEMPERATURE FLEXIBLE, 60 IRHD HARDNESS RUBBER, POLYCHLOROPRENE (CR) WSD-M2D420-A3 LOW TEMPERATURE FLEXIBLE, 70 IRHD HARDNESS NOT TO BE USED FOR NEW DESIGN 1. SCOPE The materials defined by these specifications are Po
3、ly-Chloroprene Rubbers with nominal hardnesses of 60 IRHD (Suffix A2) and 70 IRHD (Suffix A3) respectively. 2. APPLICATION These specifications were released originally for materials used for drive shaft dust boots where low temperature flexibility down to -40 C and high tear strength are required.
4、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). 3.4 MATERIAL TESTING 3.4.1 Preparation of Test Specimens Whenever possible, all test specimens shall
5、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 test sheets shall have the following dimensions: 150 x 150 mm, min x 2.0 +/- 0.2 mm 3.5 ORIGINAL PROPERTIES A
6、2 A3 3.5.1 Hardness, 55 - 65 65 - 75 International (ASTM D 1415) 3.5.2 Hardness, Durometer A 55 - 65 65 - 75 (ISO 868/ASTM D 2240, instantaneous, plied-up specimen. Hand held durometers shall not be used) ENGINEERING MATERIAL SPECIFICATIONWSD-M2D420-A2/A3 Printed copies are uncontrolled Copyright 20
7、09, Ford Global Technologies, LLC Page 2 of 3 A2 A3 3.5.3 Tensile Strength, MPa, min 12 15 (ISO 37/ASTM D 412, Die C) 3.5.4 Elongation at Break, %, min 300 240 (Test Method according to para 3.5.3) 3.5.5 Modulus at 100% 2.4 4.5 4.6 7.0 Elongation, MPa (Test Method according to para 3.5.3) 3.5.6 Tear
8、 Strength, kN/m, min 15 20 (ISO 34, Method B, procedure (a)/ASTM D 624, Die C) 3.5.7 Brittleness Point, max -40 C (ISO 812, Type B specimen/ ASTM D 2137, Method A) 3.5.8 Ozone Resistance, max Rating 0 (FLTM BP 101-01, Procedure A) 3.5.9 Compression Set, max 30% (ISO 815/ASTM D 395, Method B, except
9、25% compression, plied-up specimens, 22 h at 100 +/- 2 C) 3.6 HEAT AGED (ISO 188/ASTM D 573, 150 +/- 50 air changes/h, 168 h at 100 +/- 2 C) 3.6.1 Hardness Change, max +15 3.6.2 Tensile Strength Change, max -15% 3.6.3 Elongation Change, max -35% 3.6.4 Visual Evaluation No surface tackiness or cracks
10、 when folded flat against itself. 3.7 HEAT AGED (ISO 188/ASTM D 573, 150 +/- 50 air changes/h, 1000 h at 80 +/- 2 C) 3.7.1 Hardness Change, max +15 3.7.2 Tensile Strength Change, max -15% 3.7.3 Elongation Change, max -35% ENGINEERING MATERIAL SPECIFICATIONWSD-M2D420-A2/A3 Printed copies are uncontro
11、lled Copyright 2009, Ford Global Technologies, LLC Page 3 of 3 3.7.4 Visual Evaluation No surface tackiness or cracks when folded flat against itself. 3.8 IMMERSION IN OIL No. 1 (ISO 817/ASTM D 471, 168 h at 100 +/- 2 C) 3.8.1 Hardness Change, max +20 3.8.2 Tensile Strength Change, max -20% 3.8.3 El
12、ongation Change, max -40% 3.8.4 Volume Change -15 to +5% 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 100 +/- 2 C) 3.9.1 Hardness Change, max -35 3.9.2 Tensile Strength Change, max -60% 3.9.3 Elongation Change, max -50% 3.9.4 Volume Change +70% 3.9.5 Visual Evaluation No surface tackiness or cracks when folded against itself.
