1、 ENGINEERING MATERIAL SPECIFICATIONDate Action Revisions 2010 06 25 N-STATUS No replacement named C. Mracna, NA 2004 07 23 Revised Para 3.0 inserted; para 3.5.3, 3.6 & 4 deleted 1978 03 08 C Spec Released CAG2-823224-C5 Printed copies are uncontrolled Copyright 2010, Ford Global Technologies, LLC Pa
2、ge 1 of 3 POLYURETHANE MOLDING COMPOUND, MODIFIED - ESW-M2D234-C POLYETHER BASED ESA-M2D234-D NOT TO BE USED FOR NEW DESIGN 1. SCOPE The material defined by these specifications is a modified polyether based urethane compound with excellent hydrolytic stability and heat resistance. 2. APPLICATION Th
3、ese specifications were released originally for material used in transmission bellcrank grommets where toughness, vibration and shock insulation are required at elevated temperatures. 3. REQUIREMENTS ESW-M2D234-C ESA-M2D234-D 3.0 STANDARD REQUIREMENTS FOR PRODUCTION MATERIALS Material suppliers and
4、part producers must conform to the Companys Standard Requirements For Production Materials (WSS-M99P1111-A). 3.1 RAW MATERIAL 3.1.1 Specific Gravity 1.15/1.19 1.13/1.17 (ASTM D 792) 3.1.2 Molding Moisture Content, 0.25 0.25 % max 3.2 MOLDED TEST SPECIMEN at 23 + 2 C 3.2.1 Hardness, Durometer D 58/64
5、 56/62 (ASTM D 2240) 3.2.2 Tensile Modulus, MPa, min (ASTM D 412, Die C, crosshead speed 500 mm/min) At 25% Elongation 14.5 14.5 At 50% Elongation 18.5 16.5 At 100% Elongation 20.5 17.0 At 300% Elongation 25.5 19.0 At Break 30.5 34.5 Elongation at Break, % min 350 500 3.2.3 Tensile Set at 100% Strai
6、n, % max 25 25 (ASTM D 412, Die C) ENGINEERING MATERIAL SPECIFICATIONESW-M2D234-C ESA-M2D234-DPrinted copies are uncontrolled Copyright 2010, Ford Global Technologies, LLC Page 2 of 3 ESW-M2D234-C ESA-M2D234-D 3.2.4 Compression Set, % max 90 90 (ASTM D 395, plied discs, 22 h at 125 C) 3.2.5 Tear Str
7、ength, kN/m, min 131 145 (ASTM D 624, Die C) 3.2.6 Hydrolytic Stability Change, -25 -25 % max Test Method: Die C tensile specimens shall be placed in a 118 cm3open top jar which is placed in a 946 cm3screw cap jar containing 150 cm3of distilled water. The screw cap jar is secured and placed in a cir
8、culating air oven for 96 +/- 1 h at 82 +/- 1 C. Specimens are removed, conditioned for 24 +/- 0.5 h at 50% +/- 5% R.H. and 23 +/- 2 C. Tensile modulus is to be determined per para 3.2.2 and percent change reported. 3.2.7 Ozone Rating, max 0 0 (FLTM BP 101-01) 3.3 MOLDED TEST SPECIMEN AT ELEVATED TEM
9、PERATURES ESW-M2D234-C Test at 150 +/- 2 C ESA-M2D234-D Test at 160 +/- 2 C 3.3.1 Tensile Modulus, MPa, min (ASTM D 412, Die C, crosshead speed 500 mm/min) At 25% Elongation 3.5 6.5 At 50% Elongation 3.6 6.5 At 100% Elongation 4.0 6.5 At 300% Elongation - 7.4 At Break 4.6 8.1 Elongation at Break, %
10、min 175 300 ALTERNATE METHOD: Tensile Modulus, MPa, min (ASTM D 412, ring-type specimen, inside diameter 16.25 +/- 0.25 mm, radial width 1.02 +/- 0.025 mm, thickness 1.02/3.05 mm, crosshead speed 500 mm/min) ENGINEERING MATERIAL SPECIFICATIONESW-M2D234-C ESA-M2D234-DPrinted copies are uncontrolled C
11、opyright 2010, Ford Global Technologies, LLC Page 3 of 3 ESW-M2D234-C ESA-M2D234-D At 25% Elongation 5.2 5.2 At 50% Elongation 5.5 5.5 At 100% Elongation 5.9 5.9 At 300% Elongation - 7.0 At Break 7.6 8.5 Elongation at Break, % min 250 325 3.3.2 Tensile Set at 100% Strain, 60 50 % max (ASTM D 412, Di
12、e C) After the required 10 min rest period, remove test specimen from heating apparatus and immediately determine tensile set. 3.3.3 Tear Strength, kN/m, min 22 28 (ASTM D 624, Die C) 3.4 HEAT AGING ON MOLDED TEST SPECIMENS (ASTM D 573, 120 h) ESW-M2D234-C At 150 +/- 2 C ESA-M2D234-D At 160 +/- 2 C
13、3.4.1 Tensile Modulus Change, % max (ASTM D 412, Die C, 500 mm/min) At 25% Elongation -10 -10 At 50% Elongation -10 -10 At 100% Elongation -20 - At 300% Elongation - - At Break -60 -60 Elongation at Break -35 -85 Change, % max 3.4.2 Hardness, Durometer D Change +/- 5 +/- 5 3.4.3 Tear Strength Change, % max -30 -55 3.5 MOLDED PART 3.5.1 Specific Gravity 1.15/1.19 1.13/1.17 (ASTM D 792) 3.5.2 Differential Scanning 145 175 Calorimetry (DSC) Extrapolated Onset of Softening Pt., min C
