1、 ENGINEERING MATERIAL SPECIFICATIONDate Action Revisions 2009 08 13 N-STATUS No Replacement Named C. Mracna, NA 2004 07 19 Revised Para 3.0 inserted; para 3.1, 3.2, 3.3, 3.6 & 4 deleted 1973 01 26 Released F6C-91 (Was XF-M2DX42) Printed copies are uncontrolled Copyright 2009, Ford Global Technologie
2、s, LLC Page 1 of 2 SILICONE ELASTOMER, VERY LOW STRENGTH ESF-M2D228-A NOT TO BE USED FOR NEW DESIGN 1. SCOPE The material defined by this specification is a one part silicone fluid which when subjected to heat gels into a very low strength elastomer and will then crumble under load into very small p
3、articles that take on the characteristics of a fluid. 2. APPLICATION This specification was released originally for material used as the energy absorbing medium in an impact shock device such as the isolator bumper assembly. 3. REQUIREMENTS 3.0 STANDARD REQUIREMENTS FOR PRODUCTION MATERIALS Material
4、 suppliers and part producers must conform to the Companys Standard Requirements For Production Materials (WSS-M99P1111-A). 3.4 FLUID 3.4.1 Hardness 67 +/- 5 (ASTM D 2240, except use Durometer “00“) The plug is to be molded per para 5.3 of ASTM D 395 for 20 minutes at 177 +/- 3 C. 3.4.2 Compression
5、8.20 - 9.60% at 124 MPa (FLTM BP 1-4) 3.4.3 Viscosity 600 - 1200 cP (Brookfield Viscometer, Model RVF, Spindle No. 2 at 20 RPM, at 25 +/- 2 C) 3.4.4 Reversion, max -6 (FLTM BP 1-7, except use Durometer “00“) 3.4.5 Volatiles, max 2.5% (FLTM BP 1-5) ENGINEERING MATERIAL SPECIFICATIONESF-M2D228-APrinte
6、d copies are uncontrolled Copyright 2009, Ford Global Technologies, LLC Page 2 of 2 3.4.6 Cure Rheology Must be within limits established on the master curve on file at the Materials Engineering Office for the appropriate product engineering office. Equipment will be preheated to 177 +/- 3 C prior t
7、o the test sample insertion. 3.5 ADDITIONAL REQUIREMENTS Specific requirements for material and/or manufactured parts shall be specified on the Engineering drawing, Engineering parts specification and/or performance specifications. All critical areas with respect to these properties shall be clearly
8、 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 APPEARANCE No lack of clarity or consistency in the fluid, nor shall there by any particulate contamination or separation when a sample of fluid in a test tube or beaker is viewed against a white, well lit background. 5.2 DENSITY 0.97 - 1.01 (ASTM D 297) g/cm3
