1、 ENGINEERING MATERIAL SPECIFICATION Date Action Revisions Rev 03 2012 05 07 N Status No usage or replacement N. Benipal, NA 2006 09 21 Revised Inserted 3.0; Deleted 3.1, 3.2, 3.3, 3.8, 3.9 & 4 1999 07 14 Activated S. DeGrood Controlled document at www.MATS Copyright 2012, Ford Global Technologies, L
2、LC Page 1 of 2 INSULATOR, SILICONE RUBBER COATED GLASS FABRIC, WSS-M99G135-A8 ADHESIVE COATED, ONE SIDE NOT TO BE USED FOR NEW DESIGN 1. SCOPE The materials defined by this specification are silicone rubber coated glass fabrics with adhesive coating on one side which are electrical insulators and he
3、at conductors. 2. APPLICATION This specification was released originally for materials used to insulate transistors from their heat sinks in the EEC module. 3. REQUIREMENTS Material specification requirements are to be used for initial qualification of materials. 3.0 STANDARD REQUIREMENTS FOR PRODUC
4、TION MATERIALS Material suppliers and part producers must conform to the Companys Standard Requirements For Production Materials (WSS-M99P1111-A). 3.4 DIELECTRIC STRENGTH, kV/mm, min 15 (ASTM D 149) 3.5 VOLUME RESISTIVITY, ohm-cm, min 112 (ASTM D 257) 3.6 SPECIFIC GRAVITY 2.4 - 2.6 (ASTM D 792) 3.7
5、TENSILE STRENGTH, N/mm, min (ASTM D 412) Warp 11 Fill 7 5. GENERAL INFORMATION The information given below is provided for clarification and assistance in meeting the requirements of this specification. ENGINEERING MATERIAL SPECIFICATION WSS-M99G135-A8 Copyright 2012, Ford Global Technologies, LLC P
6、age 2 of 2 5.1 THERMAL RESISTANCE The performance of an insulator prepared from the glass cloth supported silicone rubber sheet stock specified herein can be determined using various test methods called “thermal resistance“ or “thermal impedance“ tests. These tests take into account variations in th
7、e thermal conductivity of the insulator caused by the adhesive, component surface finish, and clamping forces. For modeling purposes, this data may be more appropriate than thermal conductivity which is a property of the bulk material. 5.2 THICKNESS*, ADHESIVE 0.203 0.203 0.254 0.305 0.305 0.279 COATED, nominal, mm or 0.254 *Thickness originally approved. Other thicknesses may be used as specified on the engineering drawing.
