1、 ENGINEERING MATERIAL SPECIFICATIONMaterial Name Specification NumberDate Action Changes1993-01-04 EP00E10258796000 Revised para 1. and 3.10 K. Gerhards1991-11-04 EP00E01089490000 Revised Page 1-3 M. Siewert1990-08-01 EP00E01031538000 Released M. SiewertWP 3948-a Page 1 of 3 GASKET, FIBER SHEET, REI
2、NFORCED WSK-M8G235-AWITH STEEL SHEETS1. SCOPEThe materials defined by this specification are perforated or nonperfo rated steel sheets and a rubber bonded asbestos-free fiber centersheet.2. APPLICATIONThis specification was released originally for exhaust m anifold gaskets andheat shields.3. REQUIRE
3、MENTS3.1 STATISTICAL PROCESSSupplie rs must conform to the requirements of Ford Quality SystemStanda rd Q-101. A mutually acceptable Control Plan as describedth erein is required for material/source approval. Appropriatestatist ical tools must be used to analyze process/product data sothat variation
4、 in the final product is continuously reduced.3.2 INFRARED SPECTROPHOTOMETRY AND/OR THERMAL ANALYSISFord Motor Company, at its option, may conduct infrared and/ortherma l analysis of material/parts supplied to this specification.The IR spectra and thermograms established for i nitial approval shallc
5、onst itute the reference standard and shall be kept on file at thedesignated material lab oratory. All samples shall produce IR spectraand thermograms that correspond to the reference standard when testedunder the same conditions.3.3 CONDITIONING AND TEST CONDITIONSPrior to testing, the materials sh
6、all be conditioned in an oven at100 +/- 2 C for 1 h and allowed to cool to 23 +/ - 2 C in a desiccatorcontaining anhydrous ca lcium chloride. All tests shall be conductedin accordance with ASTM F 104, Type 1 material unless otherwisespeci fied. The requirements of this specification are valid forgas
7、ket material of 1.5 to 2.5 mm thickness. Tes t specimens are to beselected from finished gaskets when practicable.ENGINEERING MATERIAL SPECIFICATIONWSK-M8G235-AWP 3948-b Page 2 of 3 3.4 CONSTRUCTIONConsists of two low carbon steel sheets which are properly recessedand formed so as to hav e closely p
8、rojecting tangs which are deformedduring processing and serve to close over and ho ld the fiber sheet tothe steel sheets without the use of cement.3.4.1 Steel SheetsLow ca rbon steel, thickness and finish as specified onEngineering Drawing.3.4.2 Center Fiber SheetSynthetic rubber bonded asbestos-fre
9、e fiber sheet.3.5 ORIGINAL PROPERTIES3.5.1 Ignition Loss of Fiber Sheet 12 - 20 %(ASTM F 495)3.5.2 Compressibility 8 - 16 %(ASTM F 36, Procedure A)3.5.3 Recovery, min 30 %(ASTM F 36, Procedure A)3.6 HEAT AGING(ASTM D 573, 22 h at 200 +/- 2 C)3.6.1 Compressibility 6 - 16 %3.6.2 Recovery, min 28 %3.7
10、RESISTANCE TO ASTM OIL No. 1(ASTM F 146, 5 h at 150 +/- 2 C)3.7.1 Thickness Change 0 to + 5 %3.7.2 Compressibility 8 - 18 %3.7.3 Recovery, min 35 %3.8 RESISTANCE TO ASTM OIL No. 3(ASTM F 146, 5 h at 150 +/- 2 C)3.8.1 Thickness Change 0 to + 6 %3.8.2 Compressibility 8 - 18 %3.8.3 Recovery, min 35 %EN
11、GINEERING MATERIAL SPECIFICATIONWSK-M8G235-AWP 3948-b Page 3 of 3 3.9 RESISTANCE TO 85 % FUEL C + 15 % METHANOL(ASTM F 146, 22 h at 23 +/- 2 C)3.9.1 Thickness Change 0 to + 12 %3.9.2 Compressibility 12 - 21 %3.9.3 Recovery, min 30 %3.10 SUPPLIERS RESPONSIBILITYAll materials supplied to this specific
12、ation must be equivalent inal l characteristics to the material upon which approval wasoriginally granted.Pr ior to making any changes in the properties, composition,co nstruction, color, processing or labelling of the materialorig inally approved under this specification, whether or not suchchange
13、s affect the materials ability to meet the specificationrequir ements, the Supplier shall notify Purchasing, Toxicology andthe affected Materials Engineering activity of the proposed changesand obtain the written approval of the Materials Engineeringactivity. Test data, test samples and a new code i
14、dentification areto be submitted with the request.Substance restrictions imposed by law, regulations or Ford apply tothe mat erials addressed by this document. The restrictions aredefined in Engineering Material Specification WSS-M99P9999-A1. 4. APPROVAL OF MATERIALSMat erials defined by this specif
15、ication must have prior approval by theresponsible Materials Engineeri ng activity. Suppliers desiring approval ofthe ir materials shall first obtain an expression of interest from theaffec ted Purchasing, Design and Materials Engineering activity. Uponrequest, the Supplier shall submit to the affec
16、ted Materials Engineeringactivity a completed copy of their laboratory test reports, signed by aqualified and authorized representative of the test faci lity, demonstratingful l compliance with all the requirements of this specification (testresults, not nominal values), the material designation a n
17、d code number, andtes t specimens for Ford evaluation. Fords engineering approval of amateri al will be based on its performance to this specification and on anassessment of suitability for intended process and/or application. Uponapprov al, the material will be added to the Engineering Material ApprovedSource List.
