1、 ENGINEERING MATERIAL SPECIFICATIONDate Action Revisions 2004 09 30 Revised Inserted 3.0; Deleted 3.1, 3.2, 3.3, 3.10 Corrected numbering 3.5.9 1993 07 26 Released C10320585 B HennesseyPrinted copies are uncontrolled Copyright 2004, Ford Global Technologies, LLC Page 1 of 3 RUBBER, SILICONE (VMQ) VE
2、RY HIGH TEMPERATURE WSD-M2D453-A RESISTANT 1. SCOPE The material defined by this specification is a silicone rubber (VMQ) with short-term resistance to very high temperatures up to 300 C. 2. APPLICATION This specification was released originally for material used as spark plug boots capable of long-
3、term operation at temperatures up to 175 C and withstanding peak temperatures up to 300 C. The material remains flexible down to -40 C and has moderate resistance to oils. 3. REQUIREMENTS 3.0 STANDARD REQUIREMENTS FOR PRODUCTION MATERIALS Material suppliers and part producers must conform to the Com
4、panys Standard Requirements For Production Materials (WSS-M99P1111-A). 3.4 MATERIAL TESTING 3.4.1 Preparation of Test Specimens Whenever possible, all test specimens shall be die-cut from the finished parts. When not feasible, specimens cut from molded test sheets manufactured from the same material
5、 and with equivalent cure to molded parts are recommended. The test sheets shall have the following dimensions: 150 x 150 mm, min x 2.0 +/- 0.2 mm 3.5 ORIGINAL PROPERTIES 3.5.1 Hardness, Durometer A 48 to 60 (ASTM D 2240, instantaneous, plied-up specimen. Hand held durometers shall not be used) 3.5.
6、2 Tensile Strength, min 6 MPa (ISO 37, Type 1 dumb-bell) 3.5.3 Elongation at Break, min 350% (Test Method according to para 3.5.2) 3.5.4 Modulus at 100% Elongation 1.0 - 2.5 MPa (Test Method according to para 3.5.2) 3.5.5 Tear Strength, min 18 kN/m (ISO 34, Method B, procedure (a) ENGINEERING MATERI
7、AL SPECIFICATIONWSD-M2D453-APrinted copies are uncontrolled Copyright 2004, Ford Global Technologies, LLC Page 2 of 33.5.6 Brittleness Point, max -40 C (ISO 812, Type B specimen) 3.5.7 Ozone Resistance, max Rating 0 (FLTM BP 101-01, Procedure A) 3.5.8 Compression Set, max 40% (ISO 815, Sample A exce
8、pt 25% compression, plied-up specimens, 70 h at 175 +/- 2 C) 3.5.9 Dielectric Strength, min (IEC 243/ASTM D 149 in insulating oil) 3.5.9.1 Short Time 17.5 kV/mm 3.6 HEAT AGED (ISO 188, 150 +/- 50 air changes/h, 70 h at 315 +/- 2 C) 3.6.1 Hardness Change, max +25 3.6.2 Tensile Strength , min 3.0 MPa
9、3.6.3 Elongation at Break, min 150% 3.6.4 Visual Evaluation No surface tackiness or cracks when folded flat against itself. 3.7 HEAT AGED (ISO 188, 150 +/- 50 air changes/h, 1000 h at 175 +/- 2 C) 3.7.1 Hardness Change, max +15 3.7.2 Tensile Strength, min 5.0 MPa 3.7.3 Elongation Change, min 250% 3.
10、7.4 Visual Evaluation No surface tackiness or cracks when folded flat against itself. 3.8 IMMERSION IN OIL No. 1 (ISO 1817, 70 h at 150 +/- 2 C) 3.8.1 Hardness Change, max -15 3.8.2 Tensile Strength, min 5.0 MPa 3.8.3 Elongation at Break, min 250% 3.8.4 Volume Change +10% 3.8.5 Visual Evaluation No
11、surface tackiness or cracks when folded flat against itself. ENGINEERING MATERIAL SPECIFICATIONWSD-M2D453-APrinted copies are uncontrolled Copyright 2004, Ford Global Technologies, LLC Page 3 of 33.9 FINISHED PART 3.9.1 Hardness, International 48 to 60 IRHD (ISO 48, micro) 3.9.2 Cold Flexibility No
12、cracking Method: Heat age part for 70 h at 300 +/- 2 C then age for a further 70 h at -40 +/- 2 C. Place part on a horizontal firm surface and, within 5 seconds, drop a steel ball weighing 225 +/- 5 gms from a height of 300 mm. Inspect the part for cracks. 3.9.3 Flammability, max 100 mm/minute (ISO 3795)
