1、 ENGINEERING MATERIAL SPECIFICATIONDate Action Revisions 2009 09 22 N-STATUS Use industry standard C. Mracna, NA 2004 10 20 Revised Inserted 3.0; Deleted 3.1, 3.2, 3.3, 3.9, 3.10 & 4 1996 05 09 Activated E. J. Duda Printed copies are uncontrolled Copyright 2009, Ford Global Technologies, LLC Page 1
2、of 3 SILICONE (VMQ) RUBBER, IMPROVED COMPRESSION WSS-M2D489-A2 SET, 60 DUROMETER, LOW VOLATILES, LONG LIFE GASKET NOT TO BE USED FOR NEW DESIGN 1. SCOPE The material defined by this specification is a medium modulus, silicone rubber with low silicone volatiles, good compression set and stress relaxa
3、tion, suitable for high temperature service conditions. 2. APPLICATION This specification was released originally for material used as the third generation best-in-class gasket where moderate to high compressive strength at moderate to high temperature is required for use as cam cover, oil pan and f
4、ront cover gaskets. Low volatile silicone rubber is needed to prevent silica contamination of emission components. 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
5、-M99P1111-A). 3.4 MATERIAL TESTING 3.4.1 Preparation of Test Specimens Test specimens may be taken from either test sheets or molded parts. To insure a proper cutting of specimens, backup all test sheets/parts with cardboard or a rubber sheet. The test sheets shall have the following dimensions: 150
6、 x 150 mm, min x 2.0 +/- 0.2 mm. . Tensile Strength per ISO 37/ASTM D 412, die C, full thickness. If the length between the compression limiters is not long enough to accommodate a die C, use a die exactly one-half the dimensions of the die C. . Tear Strength per ISO 34/ASTM D 624, full thickness. .
7、 Volume Change - 25 mm x part width x part thickness. . Compression Set - 25 mm long x part width x single thickness minus any skirt. Do not buff any sample including those with a bead, except for compression set. ENGINEERING MATERIAL SPECIFICATIONWSS-M2D489-A2Printed copies are uncontrolled Copyrig
8、ht 2009, Ford Global Technologies, LLC Page 2 of 3 3.5 ORIGINAL PROPERTIES 3.5.1 Density 1.26 - 1.31 g/cm3(ISO 1183, Method A/ASTM D 297) 3.5.2 Hardness, International 55 - 67 (ISO 48/ASTM D 1415) 3.5.3 Hardness, Durometer A 55 - 67 (ISO 868/ASTM D 2240, instantaneous, plied-up specimen. Hand held d
9、urometers shall not be used) 3.5.4 Tensile Strength, min 6.5 MPa (ISO 37/ASTM D 412, Die C) 3.5.5 Elongation at Break, min 350% (Test Method according to para 3.5.4) 3.5.6 Modulus at 100% Elongation 2600 - 3500 kPa (Test Method according to para 3.5.4) 3.5.7 Tear Strength, min 20 kN/m (ISO 34, Metho
10、d C/ASTM D 624, Die B) 3.5.8 Low Temperature Retraction -45 C (RT-10)(ASTM D 1329) 3.5.9 Ozone Resistance, max Rating 0 (FLTM BP 101-01, Procedure A) 3.5.10 Compression Set, max 20% (ISO 815/ASTM D 395, Method B, except 25% compression, plied-up specimens) 3.5.10.1 22 h at 175 +/- 2 C 3.5.11 Silicon
11、e Volatiles, as received at Ford, max 0.60% (FLTM AV 102-01) 3.5.12 Compression Stress Relaxation (ISO 3384/ASTM TBD) Washer sampler # 3, 25% compression 1000 h, 150 +/- 2 C in IRM 903 Force Retention, min 20% ENGINEERING MATERIAL SPECIFICATIONWSS-M2D489-A2Printed copies are uncontrolled Copyright 2
12、009, Ford Global Technologies, LLC Page 3 of 3 3.6 HEAT AGED (ISO 188/ASTM D 573, 150 +/- 50 air changes/h, 1000 h at 150 +/- 2 C) 3.6.1 Hardness Durometer A Change, max +12 3.6.2 Tensile Strength Change, max -20% 3.6.3 Elongation Change, max -55% 3.6.4 Visual Evaluation No surface tackiness or crac
13、ks when folded flat against itself. 3.7 IMMERSION IN OIL IRM 902 (ISO 1817/ASTM D 471, 1000 h at 150 +/- 2 C) 3.7.1 Hardness Durometer A Change, max -12 3.7.2 Tensile Strength Change, max -20% 3.7.3 Elongation Change, max -38% 3.7.4 Volume Change +18% 3.7.5 Visual Evaluation No surface tackiness or cracks when folded flat against itself. 3.8 COMPRESSION MODULUS 1700 - 2300 kPa (ASTM D 575, Method A, 25% deflection) 5. GENERAL INFORMATION The information given below is provided for clarification and assistance in meeting the requirements of this specification. 5.1 RECYCLING CODE VMQ
