1、 ENGINEERING MATERIAL SPECIFICATIONDate Action Revisions 2009 09 17 N-STATUS No Replacement Named, No known use. C. Mracna, NA 2004 11 30 Revised Para 3.0 inserted; para 3.1, 3.2, 3.3, 3.10, 3.11 & 4 deleted 1996 06 11 Activated E. J. Duda Printed copies are uncontrolled Copyright 2009, Ford Global
2、Technologies, LLC Page 1 of 3 SILICONE (VMQ) RUBBER, HIGH TEMPERATURE WSS-M2D418-A3 RESISTANT, LONG LIFE GROMMET NOT TO BE USED FOR NEW DESIGN 1. SCOPE The material defined by this specification is a low modulus silicone rubber with excellent compression set, suitable for long-term, high temperature
3、 service conditions. 2. APPLICATION This specification was released originally for material used as the isolator bushing grommet for the rocker arm cover. This material has good compression set and heat resistance. 3. REQUIREMENTS 3.0 STANDARD REQUIREMENTS FOR PRODUCTION MATERIALS Material suppliers
4、 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 Test specimens may be taken from either test sheets or molded parts. To insure a proper cutting of specimens, backup all test she
5、ets/parts with cardboard or a rubber sheet. The test sheets shall have the following dimensions: 150 x 150 mm, min x 2.0 +/- 0.2 mm. The test sheets must be cured for 10 minutes at 177 C. 3.5 ORIGINAL PROPERTIES 3.5.1 Density 1.24 - 1.30 g/cm3(ISO 1183, Method A/ASTM D 297) 3.5.2 Hardness, Internati
6、onal 70 - 80 (ISO 48/ASTM D 1415) 3.5.3 Hardness, Durometer A 70 - 80 (ISO 868/ASTM D 2240, instantaneous plied-up specimen. Hard held durometers shall not be used) 3.5.4 Tensile Strength, min 7.0 MPa (ISO 37/ASTM D 412, Die C) ENGINEERING MATERIAL SPECIFICATIONWSS-M2D418-A3Printed copies are uncont
7、rolled Copyright 2009, Ford Global Technologies, LLC Page 2 of 3 3.5.5 Elongation at Break, min 200% (Test Method according to para 3.5.4) 3.5.6 Modulus at 100% Elongation, min 4.0 MPa (Test Method according to para 3.5.4) 3.5.7 Tear Strength, min 18 kN/m (ISO 34, Method B, Procedure (a)/ ASTM D 624
8、, Die B) 3.5.8 Brittleness Point, max -60 C (ISO 812, Type B specimen/ASTM D 2137, Method A) 3.5.9 Ozone Resistance, max Rating 0 (FLTM BP 101-01, Procedure A) 3.5.10 Compression Set, max 25% (ISO 815/ASTM D 395, Method B, except 25% compression, plied-up specimens, 22 h at 175 +/- 2 C) 3.5.11 Silic
9、one Volatiles, max 0.60% (FLTM AV 102-01, as received at Ford Motor Company) 3.6 HEAT AGED (ISO 188/ASTM D 573, 150 +/- 50 air changes/h, 168 h at 175 +/- 2 C) 3.6.1 Hardness Durometer A Change +8 3.6.2 Tensile Strength Change, max -15% 3.6.3 Elongation Change, max -35% 3.6.4 Visual Evaluation No su
10、rface tackiness or cracks when folded flat against itself. 3.7 HEAT AGED (ISO 188/ASTM D 573, 150 +/- 50 air changes/h, 1,000 h at 150 +/- 2 C) 3.7.1 Hardness Durometer A Change +10 3.7.2 Tensile Strength Change, max -18% 3.7.3 Elongation Change, max -35% 3.7.4 Visual Evaluation No surface tackiness
11、 or cracks when folded flat against itself. ENGINEERING MATERIAL SPECIFICATIONWSS-M2D418-A3Printed copies are uncontrolled Copyright 2009, Ford Global Technologies, LLC Page 3 of 3 3.8 IMMERSION IN OIL No. 1 (ISO 1817/ASTM D 471, 168 h at 150 +/- 2 C) 3.8.1 Hardness Durometer A Change -10 3.8.2 Tens
12、ile Strength Change, max -14% 3.8.3 Elongation Change, max -32% 3.8.4 Volume Change +1 to +10% 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 150 +/- 2 C) 3.9.1 Hardness Durometer A Change -22 3.9.2 Tensile Strength Change, max -25% 3.9.3 Elongation Change, max -40% 3.9.4 Volume Change, max +5 to +45% 3.9.5 Visual Evaluation No surface tackiness or cracks when folded flat against itself.
