1、 ENGINEERING MATERIAL SPECIFICATION Material Name Specification Number Date Action Changes 2014 10 21 N Status No replacement named L. Sinclair, NA 1999 01 07 Revised Revised paras 3.4, 3.5 S. DeGrood 1997 12 29 Revised Updated & Revised para 1, 2, 3.4, 3.5 L. Gullen 1993 01 11 NGA1E10269419000 Rele
2、ased L. Gullen WP 3948-a Page 1 of 4 SEALANT, SILICONE RUBBER, ULTRA VIOLET/ WSL-M4G349-A METHOXY CURE NOT TO BE USED FOR NEW DESIGN 1. SCOPE The material defined by this specification is a noncorrosive, ultraviolet/methoxy cure, self-leveling, one component, room temperature vulcanizing silicone ru
3、bber. Curing of this material is significantly accelerated by exposure to ultraviolet light. 2. APPLICATION This specification was released originally for material used as a sealant on the body to frame cable for light trucks. It has been revised for use on air bag modules. 3. REQUIREMENTS 3.1 QUALI
4、TY SYSTEM REQUIREMENTS Material suppliers and part producers must conform to Quality System Requirements, QS-9000. Material specification requirements are to be used for initial qualification of materials. A Control Plan for ongoing production verification is required. This plan must be reviewed and
5、 approved by the relevant Ford Materials activity and/or Ford Supplier Technical Assistance (STA) prior to production parts submission. Appropriate statistical tools must be used to analyze process/product data and assure consistent processing of the materials. Part producers using this material in
6、their products, must use Ford approved materials and must conform to a process control plan which has been approved by STA and/or the relevant Materials Activity. ENGINEERING MATERIAL SPECIFICATION WSL-M4G349-A WP 3948-b Page 2 of 4 3.2 INFRARED SPECTROPHOTOMETRY AND/OR THERMAL ANALYSIS Ford Motor C
7、ompany, at its option, may conduct infrared and/or thermal analysis of material/parts supplied to this specification. The IR spectra and thermograms established for initial approval shall constitute the reference standard and shall be kept on file at the designated material laboratory. All samples s
8、hall 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 material conditioned in a controlled atmosphere of 23 +/- 2 C and 50 +/- 5 % relative humidity f
9、or not less than 24 h prior to testing and tested under the same conditions unless otherwise specified. 3.4 UNCURED PROPERTIES 3.4.1 Color Straw-colored 3.4.2 Viscosity at 25C +/- 0.5 75,000 - 120,000 (ASTM D 1084, Method B, Model mPa.s Brookfield RVT, Spindle 6, 2.5 RPM) 3.4.3 Skin-over Time, max 3
10、0s (FLTM BV 125-01, 70 mW/cm2, at 365 nm) 3.4.4 Non-Volatiles, min 95 % (24 h at 70 C, by weight) 3.4.5 Density, range 1.01 - 1.07 (ASTM D1895) g/cm3 3.5 CURED PROPERTIES Test Slabs: 1.80 +/- 0.5 mm thick, cured at 70 mW/cm2 at 365 nm for 60 s each side followed by 72 h at 23 +/- 2 C and 50 +/- 5 %
11、relative humidity. 3.5.1 Hardness, Durometer A, min. 25 (ISO 868/ASTM D 2240) 3.5.2 Tensile Strength, min 1000 kPa (ISO 37/ASTM D 412, Die C) 3.5.3 Elongation, min 135 % (Test Method according to para 3.5.2) ENGINEERING MATERIAL SPECIFICATION WSL-M4G349-A WP 3948-b Page 3 of 4 3.5.4 Tear Strength, m
12、in 1.7 N/mm2 (ISO 34, Method B, procedure (a)/ ASTM D 624, Die C) 3.5.5 Low Temperature Brittleness Pass at - 54 C (ISO 812, Type B specimen/ASTM D 3111, Method A) 3.5.6 Shear Adhesion, min (ISO 4587/ASTM D 1002) . Aluminum to Polycarbonate 600 kPa . Steel to Polycarbonate 700 kPa . Polycarbonate to
13、 Polycarbonate 800 kPa 3.6 QUALITY Shall be a smooth homogeneous mixture, free from foreign materials and properties detrimental to normal production application. It shall not contain particles or solid spots of significant size to cause blockage of a 508 micrometer diameter orifice. 3.7 SUPPLIERS R
14、ESPONSIBILITY All materials supplied to this specification must be equivalent in all characteristics to the material upon which approval was originally granted. Prior to making any change in the properties, composition, construction, color, processing or labeling of the material originally approved
15、under this specification, whether or not such changes affect the materials ability to meet the specification requirements, the Supplier shall notify Purchasing, Toxicology and the affected Materials Engineering activity of the proposed changes and obtain the written approval of the Materials Enginee
16、ring activity. Test data, test samples and a new code identification are to be submitted with the request. Substance restrictions imposed by law, regulations or Ford, apply to the materials addressed by this document. The regulations are defined in Engineering Materials Specification WSS-M99P9999-A1
17、 ENGINEERING MATERIAL SPECIFICATION WSL-M4G349-A WP 3948-b Page 4 of 4 4. APPROVAL OF MATERIALS Materials defined by this specification must have prior approval by the responsible Materials Engineering activity. Suppliers desiring approval of their materials shall first obtain an expression of inte
18、rest from the affected Purchasing, Design and Materials Engineering activity. Upon request, the Supplier shall submit to the affected Materials Engineering activity a completed copy of their laboratory test reports, signed by a qualified and authorized representative of the test facility, demonstrat
19、ing full compliance with all the requirements of this specification (test results, not nominal values), the material designation and code number, and test specimens for Ford evaluation. Fords engineering approval of a material will be based on its performance to this specification and on an assessment of suitability for intended processes and/or applications. Upon approval, the material will be added to the Engineering Material Approved Source List.
