1、 ENGINEERING MATERIAL SPECIFICATIONMaterial Name Specification NumberDate Release No. Released1994 11 02 EP00E10348615000 Released K. GerhardsWP 3948-a Page 1 of 3 GASKET, STEEL CORE, NBR WSK-M8G246-A21. SCOPEThe mat erial defined by this specification consist of a low carbon steelcore covered equal
2、ly on both sides with an NBR.2. APPLICATIONThis specification was released originally as oil pan gasket.3. REQUIREMENTS3.1 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 mat
3、erial/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 THERMAL ANALYSISFord Motor Company, at its option, may conduct infrared and/ortherma l analysis of mat
4、erial/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 lab oratory. All samples shall produce IR spectraand thermograms that correspond to the reference st
5、andard when testedunder the same conditions.3.3 CONDITIONING AND TEST CONDITIONSAll tests shall be conducted in accordance with ASTM F 104 type 7materia l unless otherwise specified. The requirements of thisspecifi cation are valid for gasket material of 0.35 to 0.60 mmthickness. Test specimens are
6、to be selected from finished gasketswhen practicable.Prior to testing, the m aterial shall be conditioned for at least 4 hat 23 +/- 2 C in a closed chamber containing anhydrous calciumchloride as a dessicant . The air in the chamber shall be circulatedby gentle mechanical ag itation. Specimens shall
7、 then be transferredimmed iately to a controlled humidity room and conditioned for atleast 20 h at 23 +/- 2 C and 50 +/- 5 % relative humidity.ENGINEERING MATERIAL SPECIFICATIONMaterial Name Specification NumberWSK-M8G246-A2WP 3948-b Page 2 of 3 3.4 COMPOSITION3.4.1 Steel CoreLow ca rbon steel, thic
8、kness and finish as specified onEngineering drawing.3.5 ORIGINAL PROPERTIES3.5.1 Ash Content of Covering Material, max 6 %(TGA, 1000 C, Ramp 20 C/min,20 - 700 C N2, 700 - 1000 air)3.6 CREEP RELAXATION, max 6 %(ASTM F 38, Method B, 22 h at 150 +/- 2 C)3.7 HEAT AGING(ASTM D 573 22 h at 150 +/- 2 C)3.7
9、.1 Weight Change 0.5 %3.8 RESISTANCE TO ASTM OIL No. 1(ASTM F 146, 5 h at 150 +/- 2 C) 3.8.1 Thickness Change - 1.0 to 5.0 %3.9 RESISTANCE TO ASTM OIL No. 3(ASTM F 146, 5 h at 150+/- 2 C.) 3.9.1 Thickness Change 2.0 to 6.0 %3.10 RESISTANCE TO ASTM Fuel C + Methanol(ASTM F 146, 22 h at 23 +/- 2 C,85
10、vol. % Fuel C + 15 vol. % methanol)3.10.1 Thickness Change 2.0 to 10.0 %3.10.2 Delamination (added for laminated materials)Test Method: Firmly hold the sample at one point on acircu lar mandrel of diameter 6.0 mm thickness and forceslowly but firmly under finger pressure to contact the fulldiameter
11、of the mandrel. Failure shall be any c racks, breaksor surface separation or delamination at the app roximate time(5 +/- 1 s) required to flex the specimen.3.11 RESISTANCE TO COOLANT & WATER (50:50)(ASTM F 146)Test Method: Immerse the sample in engine coolant WSE-M97B44-D anddistill ed water (50:50
12、Vol. %). Use a suitable distillation flaskan d a reflux condenser and reflux for 70 hours at boilingtemperature.ENGINEERING MATERIAL SPECIFICATIONMaterial Name Specification NumberWSK-M8G246-A2WP 3948-b Page 3 of 3 3.11.1 Thickness Change 0 to 3.0 %3.11.3 Delamination (added for laminated materials)
13、(see 3.10.2)3.12 SUPPLIERS RESPONSIBILITYAll materials supplied to this specification must be equivalent inal l characteristics to 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 mat
14、erialorig inally approved under this specification, whether or not suchchange 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
15、of the Materials Engineeringactivity. Test data, t est samples and a new code identification areto be submitted with the request.Substance restrictions imposed by law, regulations or Ford, apply tothe materials addressed by this document. The restrictions aredefined in Engineering Materials Specific
16、ation WSS-M99P9999-A1.4. APPROVAL OF MATERIALSMat erials defined 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 Mate
17、rials Engineering activity. Uponrequest, the Supplier shall submit 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 thi
18、s specification (testresults, not nominal values), the material 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 i ntended processes and/or applications. Uponapprov al, the material will be added to the Engineering Material ApprovedSource List.
