1、 ENGINEERING MATERIAL SPECIFICATIONDate Action Revisions 2010 05 25 N-STATUS No replacement named C. Mracna, NA 2004 07 22 Revised Para 3.0 inserted; para 3.1, 3.2, 3.3, 3.13 & 4 deleted 1994 04 12 Released C10395439 B.Hennessey Printed copies are uncontrolled Copyright 2010, Ford Global Technologie
2、s, LLC Page 1 of 3 TUBING, SILICONE RUBBER, HIGH TEMPERATURE WSD-M2D249-A3 70 HARDNESS NOT TO BE USED FOR NEW DESIGN 1. SCOPE The material defined by this specification is a high heat and tear resistant silicone rubber with a nominal hardness of 70 IRHD. 2. APPLICATION This specification was release
3、d originally for material used in vacuum lines for engine applications which will not cut or tear when repeatedly flexed at high temperatures. It may be used for tubing or molded parts. 3. REQUIREMENTS 3.0 STANDARD REQUIREMENTS FOR PRODUCTION MATERIALS Material suppliers and part producers must conf
4、orm 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 finished parts. When not feasible, specimens cut from molded test sheets manufactured from the
5、 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 3.5 ORIGINAL PROPERTIES 3.5.1 Hardness, International 65 - 75 (ISO 48, plied-up specimen) 3.5.2 Tensile Strength 7.5 MPa (ISO 37, Die C) 3.
6、5.3 Elongation at Break, min 300% (Test Method according to para 3.5.2) 3.5.4 Modulus at 100% Elongation 1.5 to 4.0 MPa (Test Method according to para 3.5.2) 3.5.5 Tear Strength 14 kN/mm (ISO 34, Method B, procedure (a) ENGINEERING MATERIAL SPECIFICATIONWSD-M2D249-A3Printed copies are uncontrolled C
7、opyright 2010, Ford Global Technologies, LLC Page 2 of 3 3.5.6 Ozone Resistance, max Rating 0 (FLTM BP 101-01, Procedure A) 3.5.7 Compression Set 30% (ISO 815, Method B, except 25% compression, plied-up specimens, 70 h at 150 C) 3.5.8 Silicone Volatiles 0.55% (FLTM AV 102-01, as received at Ford Mot
8、or Company) 3.6 HEAT AGED (ISO 188/ASTM D 573, 150 +/- 50 air changes/h, 168 h at 225 +/- 2 C) 3.6.1 Hardness Change + 20 3.6.2 Tensile Strength Change -45% 3.6.3 Elongation Change -65% 3.6.4 Tear Strength Change, max -20% 3.6.5 Visual Evaluation No surface tackiness or cracks when folded flat again
9、st itself. 3.7 HEAT AGED (ISO 188, 150 +/- 50 air changes/h, 1,000 h at 225 C) 3.7.1 Hardness Change + 15 3.7.2 Tensile Strength Change -45% 3.7.3 Elongation Change -65% 3.7.4 Tear Strength Change -10% 3.7.5 Visual Evaluation No surface tackiness or cracks when folded flat against itself. 3.8 IMMERS
10、ION IN OIL NO. 1 (ISO 1817, 166 h at 177 +/- 2 C) 3.8.1 Hardness Change -10 3.8.2 Tensile Strength Change -35% 3.8.3 Elongation Change -35% 3.8.4 Volume Change + 10% ENGINEERING MATERIAL SPECIFICATIONWSD-M2D249-A3Printed copies are uncontrolled Copyright 2010, Ford Global Technologies, LLC Page 3 of
11、 3 3.8.5 Visual Evaluation No surface tackiness or cracks when folded flat against itself. 3.9 COLD FLEXIBILITY No cracks Using samples from 3.7, flex over 76 mm mandrel after 70 h at 40 C. 3.10 VACUUM COLLAPSE, max 10% The collapse of the outer diameter of the tubing produced from this compound sha
12、ll be determined under an internal vacuum of 81 kPa for 5 minutes (vacuum tubing only). 3.11 BURST PRESSURE 520 kPa (FLTM BP 101-01) 3.12 ADDITIONAL REQUIREMENTS Specific requirements for material and/or manufactured parts shall be specified on the Engineering drawing, Engineering parts specificatio
13、n and/or performance specifications. All critical areas with respect to these properties shall be clearly designated on the engineering drawing. 5. GENERAL INFORMATION The information given below is provided for clarification and assistance in meeting the requirements of this specification. 5.1 HARDNESS, DUROMETER A 65 - 75
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