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 04 03 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-M2D490-A1 SET, 70 DUROMETER, LOW VOLATILES, LONG LIFE GASKET NOT TO BE USED FOR NEW DESIGN 1. SCOPE The material defined by this specification is a high modulus, silicone rubber with low silicone volatiles, good compression set and excellent stres
3、s relaxation, suitable for moderate 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 an oil pan gasket where high compressive strength at moderate high temperature is required. Low
4、 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-M99P1111-A). 3.4 MATER
5、IAL TEST 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 x 150 mm, min x 2.0 +/- 0
6、.2 mm. . Tensile Strength per ISO 371/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. . Volume Change - 25 mm x
7、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-M2D490-A1Printed copies are uncontrolled Copyright 2009, Ford Global Tech
8、nologies, LLC Page 2 of 3 3.5 ORIGINAL PROPERTIES 3.5.1 Density 1.12 - 1.16 g/cm3(ISO 1183, Method A/ASTM D 297) 3.5.2 Hardness, International 70 +/- 5 (ISO 48/ASTM D 1415) 3.5.3 Hardness, Durometer A 65 - 75 (ISO 868/ASTM D 2240, instantaneous, plied-up specimen. Hand held durometers shall not be u
9、sed) 3.5.4 Tensile Strength, min 7.0 MPa (ISO 37/ASTM D 412, Die C) 3.5.5 Elongation at Break, min 300% (Test Method according to para 3.5.4) 3.5.6 Modulus at 100% Elongation 3400 - 4200 kPa (Test Method according to para 3.5.4) 3.5.7 Tear Strength, min 20 kN/m (ISO 34, Method C/ASTM D 624, Die B) 3
10、.5.8 Low Temperature Retraction -48 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 18% (ISO 815/ASTM D 395, Method B, except 25% compression, plied-up specimens) 3.5.10.1 22 h at 175 +/- 2 C 30% 3.5.11 Silicone Volatiles, as rece
11、ived 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-M2D490-A1Printed copies are uncontrolled Copyright 2009, Ford Global Tec
12、hnologies, 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 +10 3.6.2 Tensile Strength Change, max -20% 3.6.3 Elongation Change, max -35% 3.6.4 Visual Evaluation No surface tackiness or cracks when folded flat
13、against itself. 3.7 IMMERSION IN OIL IRM 903 (ISO 1817/ASTM D 471, 1000 h at 150 +/- 2 C) 3.7.1 Hardness Durometer A Change, max -10 3.7.2 Tensile Strength Change, max -26% 3.7.3 Elongation Change, max -32% 3.7.4 Volume Change +13% 3.7.5 Visual Evaluation No surface tackiness or cracks when folded flat against itself. 3.8 COMPRESSION MODULUS 1800 - 2400 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
