1、 ENGINEERING MATERIAL SPECIFICATIONDate Action Revisions 2009 08 27 N-STATUS No known use. No Replacement Named C. Mracna, NA 2004 09 15 Revised Para 3.0 inserted; para 3.1, 3.2, 3.3, 3.13, 3.14 & 4 deleted 1993 04 29 Released C10280418 B. Hennessey Printed copies are uncontrolled Copyright 2009, Fo
2、rd Global Technologies, LLC Page 1 of 3 SILICONE RUBBER (MQ), SELF-LUBRICATED WSD-M2D386-A2 POLYCARBONATE (PC) COMPATIBLE NOT TO BE USED FOR NEW DESIGN 1. SCOPE The material defined by this specification is a self-lubricated silicone rubber that can be used in contact with polycarbonate materials wi
3、thout causing softening or stress cracking. The material is suitable for continuous use at 150 C and has moderate resistance to oil. It remains flexible down to -40 C. 2. APPLICATION This specification was released originally for material used as electrical connector grommets. 3. REQUIREMENTS 3.0 ST
4、ANDARD REQUIREMENTS FOR PRODUCTION MATERIALS Material suppliers 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 Whenever possible, all test specimens shall be die-cut from the fi
5、nished parts. When not feasible, specimens cut from molded test sheets manufactured from the same material 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 Finished parts or test sheets shall be post-cur
6、ed at 200 C for 4 hours in an air-circulating oven. 3.5 ORIGINAL PROPERTIES 3.5.1 Hardness, International 45 - 55 IRHD (ISO 48/ASTM D 1415) 3.5.2 Tensile Strength, min 5.0 MPa (ISO 37/ASTM D 412, Die C) 3.5.3 Elongation at Break, min 300% (Test Method according to para 3.5.2) 3.5.4 Modulus at 100% E
7、longation 1.5 to 2.5 MPa (Test Method according to para 3.5.2) 3.5.5 Tear Strength, min 20 kN/m (ISO 34, Method B, procedure (a)/ ASTM D 624, Die C) ENGINEERING MATERIAL SPECIFICATIONWSD-M2D386-A2Printed copies are uncontrolled Copyright 2009, Ford Global Technologies, LLC Page 2 of 3 3.5.6 Brittlen
8、ess Point, max -40 C (ISO 812, Type B specimen/ASTM D 2137, Method A) 3.5.7 Ozone Resistance, max Rating 0 (FLTM BP 101-01, Procedure A) 3.5.8 Compression Set, max 40% (ISO 815/ASTM D 395, Method B, except 25% compression, plied-up specimens, 70 h at 125 +/- 2 C) 3.6 HEAT AGED (ISO 188/ASTM D 573, 1
9、50 +/- 50 air changes/h, 168 h at 200 +/- 2 C) 3.6.1 Hardness Change, max +15 3.6.2 Tensile Strength Change, max -40% 3.6.3 Elongation Change, max -60% 3.6.4 Visual Evaluation No surface tackiness or cracks when folded flat against itself. 3.7 HEAT AGED (ISO 188/ASTM D 573, 150 +/- 50 air changes/h,
10、 1,000 h at 150 +/-2 C) 3.7.1 Hardness Change, max +10 3.7.2 Tensile Strength Change, max -25% 3.7.3 Elongation Change, max -25% 3.7.4 Visual Evaluation No surface tackiness or cracks when folded flat against itself. 3.8 IMMERSION IN OIL NO. 3 (ISO 1817/ASTM D 471, 70 h at 150 +/- 2 C) 3.8.1 Hardnes
11、s Change, max -20 3.8.2 Tensile Strength Change, max -60% 3.8.3 Elongation Change, max -40% 3.8.4 Volume Change, max +40% 3.8.5 Visual Evaluation No surface tackiness or cracks when folded flat against itself. ENGINEERING MATERIAL SPECIFICATIONWSD-M2D386-A2Printed copies are uncontrolled Copyright 2
12、009, Ford Global Technologies, LLC Page 3 of 3 3.9 COMPATIBILITY WITH POLYCARBONATE (FLTM B0 127-03) The molded test bars shall show no evidence of cracking or crazing after the following exposures: 3.9.1 168 +/- 2 h at 50 +/- 2 C and 1.0% strain 3.9.2 70 +/- 2 h at 80 +/- 2 C and 0.5% strain 3.9.3
13、1,000 +/- 2h at 100 +/- 2 C and 0.25% strain The polycarbonate test material shall conform to WSK-M4D761-A. 5. GENERAL INFORMATION The information below is provided for clarification and assistance in meeting the requirements of this specification. 5.1 HARDNESS, DUROMETER A 45 - 55 (ISO 868/ASTM D 2240, instantaneous, plied-up specimen. Hand held durometers shall not be used)
