1、 ENGINEERING MATERIAL SPECIFICATION Material Name Specification Number Date Action Revisions 2001 02 16 Revised A. Reaume Printed copies are uncontrolled Page 1 of 4 Copyright 2001, Ford Global Technologies, Inc. SEALANT, THIXOTROPIC TWO COMPONENT SILICONE WSS-M4G356-A2 RUBBER. DISPENSED FOAM (IN PL
2、ACE) GASKET 1. SCOPE The material defined by this specification is a two component, thermally cured silicone rubber foam gasket. 2. APPLICATION 2.1 This specification was released originally to define a two component silicone material used as a form-in-place gasket between the plastic gear cover and
3、 aluminum housing for the wiper motor assembly as a barrier to prevent water and dust. The material is cured on the plastic housing prior to assembly to allow easy disassembly. This material has a continuous working temperature of -55 C to 150 C. 2.2 Other suitable application for this material woul
4、d be areas where a barrier to moisture, dust in high/low temperatures are needed. It also has NVVH enhancing properties. This material will bond to various metals and plastic substrates after appropriate surface treatment. 3. REQUIREMENTS Material specification requirements are to be used for initia
5、l qualification of materials. 3.1 QUALITY SYSTEM REQUIREMENTS Material suppliers and part producers must conform to the Companys Quality System Requirements. 3.2 INFRARED SPECTROPHOTOMETRY AND/OR THERMAL ANALYSIS IR spectra and thermograms established for initial approval shall constitute the refere
6、nce standard and shall be kept on file at the designated material laboratory. All samples shall produce IR spectra and thermograms that correspond to the reference standard when tested under the same conditions. 3.3 CONDITIONING AND TEST CONDITIONS All test values indicated herein are based on mater
7、ial conditioned in a controlled atmosphere of 23 +/- 2 C and 50 +/- 5 % relative humidity for not less than 24 h prior to testing and tested under the same conditions unless otherwise specified. ENGINEERING MATERIAL SPECIFICATION WSS-M4G356-A2 Page 2 of 4 Copyright 2001, Ford Global Technologies, In
8、c. 3.4 UNMIXED COMPONENTS PROPERTIES 3.4.1 Color Part A Black Part B Off White 3.4.2 Specific Gravity, range, (ASTM D 792, Method A) Part A 1.08 - 1.16 Part B 1.18 - 1.26 3.4.3 Viscosity, range (ASTM D 1084, Brookfield RVF, #6 spindle, 5 rpm at 25 +/- 2 C) Part A 50,000 - 200,000 MPa.s Part B 50,000
9、 - 200,000 MPa.s 3.4.4 Snap Time A spatula is dipped and withdrawn from 1:1 mixture and time recorded 150-300 Seconds when string formed snaps after extending 2.5 cm. 3.5 CURED SEALANT PROPERTIES 3.5.1 Sample Preparation Test sheets are prepared per ASTM D 412 except cross section of slab to be 6.35
10、 mm thick. Parts A & B are mixed 1:1 by weight and cured in the slab mold for 10 minutes at 75 C 3.5.1.1 Density, gms/cc 0.18 - 0.26 (ASTM D 792, Method A) 3.5.1.2 Hardness Shore 00 25 -45 (ASTM D 2240) (Mixed 1:1, cured 10 mins at 75 C) 3.5.1.3 Tensile strength Min 100 kPa (ASTM D 412, 6.35 mm thic
11、k) ENGINEERING MATERIAL SPECIFICATION WSS-M4G356-A2 Page 3 of 4 Copyright 2001, Ford Global Technologies, Inc. 3.5.1.4 Compression Set, max 10% (ASTM D 1056, 72 hrs 22 C) 3.5.1.5 Compression Deflection 25% Room Temp. (psi, max.) 7.5 (ASTM D 1056) 3.5.1.6 Compression Deflection Change % (Typical) 9 Aged 22hr 150 0C 3.6 TOTAL SILICONE VOLATILE, max VMQ
