1、 ENGINEERING MATERIAL SPECIFICATIONMaterial Name Specification NumberDate Release No. Released1994-05-03 EP00E10348591000 Released K. GerhardsWP 3948-a Page 1 of 4 GASKET, NON-ASBESTOS FIBERS, NBR BINDER WSK-M8G250-A1. SCOPEThe ma terial defined by this specification is a gasket material comprisedof
2、 a com bination of synthetic organic and inorganic fibers and nitrilebutadiene rubber binder.2. APPLICATIONThis specification was released originally for gasket ma terial used for thetransmission gaskets.3. REQUIREMENTS3.1 STATISTICAL PROCESSSupplie rs must conform to the requirements of Ford Qualit
3、y 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 in the final product is continuously reduced.3.2 INFRARED SPECTROPHOTOMETRY AND/OR TH
4、ERMAL 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 shallconst itute the reference standard and shall be kept on file at thedesignated material
5、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 CONDITIONSAll tests shall be conducted in accordance with ASTM F 104 Type 7mater ial unless otherwise specified. The requirements
6、of thisspecifi cation are valid for gasket material of 0.4 to 3.0 mmthickness. Test specimens are to be selected from finished gasketswhen practicable.ENGINEERING MATERIAL SPECIFICATIONWSK-M8G250-AWP 3948-b Page 2 of 4 Prior to testing the materials shall be conditio ned for 4 h at 23 +/-2 C i n a c
7、losed chamber containing anhydrous calcium chloride as ade siccant. The air in the chamber shall be circulated by gentlemechanical agitation. S pecimens shall then be transfered immediatelyto a controlled humidity room and conditioned fo r at least 20 h at 23+/- 2 C and 50 +/- 5 % relative humidity.
8、3.4 CONSTRUCTION3.4.1 Thickness 1.5 %3.5 ORIGINAL PROPERTIES3.5.1 Density 1.6 - 1.8 g/cm3(ASTM D 297)3.5.2 Tensile Strength, min 7.0 MPa(ASTM F 152, Method C)3.5.3 Compressibility 14 - 20 %(ASTM F 36, Procedure J)3.5.4 Recovery, min 60 %(ASTM F 36, Procedure J)3.6 SEALABILITY, max 2.5 mL/h(ASTM F 37
9、 Method A, ASTM Fuel A,6.9 MPa flange load, 0.7 MPa internal pressure)3.7 CREEP RELAXATION, max 45 %(ASTM F 38, Method B, 22 h at 125 +/- 2 C)3.8 ADHESION AND CORROSION(FLTM BV 123-01)3.8.1 After Heat Aging at 125 +/- 2 CAdhesion, max Rating 2Corrosion, max Rating 23.8.2 After Aging in Humidity Cab
10、inetAdhesion, max Rating 2Corrosion, max Rating 23.9 DIMENSIONAL STABILITY(ASTM F 1087)3.9.1 Dry Condition, Change, max +/- 2 %3.9.2 Wet Condition, Change, max +/- 2 %ENGINEERING MATERIAL SPECIFICATIONWSK-M8G250-AWP 3948-b Page 3 of 4 3.10 HEAT AGING(ISO 188/ASTM D 573, 150 +/- 50 air changes/h, 22
11、h at 125 +/- 2 C) 3.10.1 Compressibility 10 - 16 %3.10.2 Recovery, min 55 %3.10.3 Weight Change 0 to - 2 %3.11 RESISTANCE TO ASTM OIL NO. 1(ASTM F 146, 5 h at 150 +/- 2 C)3.11.1 Compressibility 10 - 16 %3.11.2 Recovery, min 50 %3.11.3 Thickness Change 0 to + 3 %3.11.4 Weight Change 0 to + 8 %3.12 RE
12、SISTANCE TO ASTM OIL NO. 3(ASTM F 146, 5 h at 150 +/- 2 C)3.12.1 Compressibility 14 - 20 %3.12.2 Recovery, min 60 %3.12.3 Thickness Change 0 to + 8 %3.12.4 Weight Change + 4 to + 12 %3.13 SUPPLIERS RESPONSIBILITYAll materials supplied to this specification must be equivalent inal l characteristics t
13、o the material upon which approval wasoriginally granted.Pri or to making any change in the properties, composition,constr uction, color, processing or labeling of the materialorig inally approved under this specification, whether or not suchchange s affect the materials ability to meet the specific
14、ationrequir 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, t est samples and a new code identification areto be submitted with the request.
15、Substance restrictions imposed by law, regulations or Ford, apply tothe materials addressed by this document. The restrictions aredefined in Engineering Material Specification WSS-M99P9999-A1.ENGINEERING MATERIAL SPECIFICATIONWSK-M8G250-AWP 3948-b Page 4 of 4 4. APPROVAL OF MATERIALSMat erials defin
16、ed by this specification must have prior approval by theresp onsible Materials Engineering activity. Suppliers desiring approvalof thei r materials shall first obtain an expression of interest from theaffec ted Purchasing, Design and Materials Engineering activity. Uponrequest, the Supplier shall su
17、bmit to the affected 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 materia
18、l designation a nd 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.
