1、 ENGINEERING MATERIAL SPECIFICATIONDate Action Revisions 2009 09 21 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 1995 10 16 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-M2D488-A2 SET, 50 DUROMETER, LOW VOLATILES, LONG LIFE GASKET NOT TO BE USED FOR NEW DESIGN 1. SCOPE The material defined by this specification is a low modulus, silicone rubber with low silicone volatiles, good compression set and stress relaxatio
3、n, suitable for high temperature service conditions. 2. APPLICATION This specification was released originally for material used as the third generation best-in-class gasket for use as oil pan and front cover gaskets. The material can be lightly loaded to impart sound damping and still retain good c
4、ompression stress relaxation. 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 Mate
5、rials (WSS-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 dimen
6、sions: 150 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 th
7、ickness. . 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-M2D488-A2Printed copies are uncontroll
8、ed Copyright 2009, Ford Global Technologies, LLC Page 2 of 3 3.5 ORIGINAL PROPERTIES 3.5.1 Hardness, International 48 - 58 (ISO 48/ASTM D 1415) 3.5.2 Hardness, Durometer A 47 - 57 (ISO 868/ASTM D 2240, instantaneous, plied-up specimen. Hand held durometers shall not be used) 3.5.3 Tensile Strength,
9、min 6.8 MPa (ISO 37/ASTM D 412, Die C) 3.5.4 Elongation at Break, min 500% (Test Method according to para 3.5.4) 3.5.5 Modulus at 100% Elongation 1200 - 1900 kPa (Test Method according to para 3.5.4) 3.5.6 Tear Strength, min 20 kN/m (ISO 34, Method C/ASTM D 624, Die B) 3.5.7 Low Temperature Retracti
10、on -42 C (TR-10)(ASTM D 1329) 3.5.8 Ozone Resistance, max Rating 0 (FLTM BP 101-01, Procedure A) 3.5.9 Compression Set, max 20% (ISO 815/ASTM D 395, Method B, except 25% compression, plied-up specimens) 3.5.9.1 22 h at 175 +/- 2 C 3.5.10 Silicone Volatiles, as received at 0.65% Ford, max (FLTM AV 10
11、2-01) 3.5.11 Compression Stress Relaxation (ISO 3384/ASTM D 6056) Washer sampler # 3, 25% compression 1000 h, 150 +/- 2 C in IRM 903 Force Retention, min 10% 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 +10 3.6.2 Tensile S
12、trength Change, max -15% ENGINEERING MATERIAL SPECIFICATIONWSS-M2D488-A2Printed copies are uncontrolled Copyright 2009, Ford Global Technologies, LLC Page 3 of 3 3.6.3 Elongation Change, max -40% 3.6.4 Visual Evaluation No surface tackiness or cracks when folded flat against itself. 3.7 IMMERSION IN
13、 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 -18% 3.7.3 Elongation Change, max -32% 3.7.4 Volume Change, max +15% 3.7.5 Visual Evaluation No surface tackiness or cracks when folded flat against itself. 3.8 COMPRESSION MODULUS 500 - 1500 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
