1、 ENGINEERING MATERIAL SPECIFICATIONMaterial Name File Control No. Specification NumberDate Release No. Release/Revision1990-05-02 EP00E01031535000 Released M. SiewertWP 3948-a Page 1 of 3 GASKET, CELLULOSE FIBERS AND NBR WSK-M8G234-A1. SCOPEThe ma terial defined by this specification is a gasket mat
2、erial comprisedof cellulose fibers and nitrile butadiene rubber (NBR).2. APPLICATIONThis specification was released originally for material used for gasketshinge tailgate and roof frame.3. REQUIREMENTS3.1 STATISTICAL PROCESSSupplie rs must conform to the requirements of Ford Quality SystemStanda rd
3、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 THERMAL ANALYSISFord
4、 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 lab oratory. All s
5、amples 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 shall be conditio ned for 4 h at 23 +/-2 C i n a closed chamber containing anhydrous calcium chloride as ad
6、e siccant. The air in the chamber shall be circulated by gentlemechanical agitation. Specimens shall then be tr ansferred immediatelyto a controlled humidity room and conditioned fo r at least 20 h at 23+/- 2 C and 50 +/- 5 % relative humidity.All tests shall be conducted in accordance with ASTM F 1
7、04 Type 3mater ial unless otherwise specified. The requirements of thisspecifi cation are valid for gasket material of 0.2 to 1.0 mmthickness. Test specimens are to be selected from finished gasketswhen practicable.ENGINEERING MATERIAL SPECIFICATIONWSK-M8G234-AWP 3948-b Page 2 of 3 3.4 ORIGINAL PROP
8、ERTIES3.4.1 Density 0.9 - 1.1 g/cm3(ASTM D 297)3.4.2 Tensile Strength, min 18 MPa(ASTM F 152, Method C)3.4.3 Compressibility 8 - 18 %(ASTM F 36, Procedure G)3.4.4 Recovery, min 45 %(ASTM F 36, Procedure G)3.5 CREEP RELAXATION, max 90 %(ASTM F 38, Method B, 22 h at 125 +/- 2 C)3.6 DIMENSIONAL STABILI
9、TY(ASTM F 1087)3.6.1 Dry Condition, Change, max +/- 1 %3.6.2 Wet Condition, Change, max +/- 3.5 %3.7 ADHESION AND CORROSION(FLTM BV 123-01)3.7.1 After Heat Aging at 125 +/- 2 CAdhesion, Rating, max 2Corrosion, Rating, max 23.7.2 After Aging in Humidity CabinetAdhesion, Rating, max 2Corrosion, Rating
10、, max 23.8 HEAT AGING(ASTM D 573, 22 h at 125 +/- 2 C)3.8.1 Compressibility 9 - 19 %3.8.2 Recovery, min 45 %3.8.3 Weight change, max - 10 %ENGINEERING MATERIAL SPECIFICATIONWSK-M8G234-AWP 3948-b Page 3 of 3 3.9 RESISTANCE TO ASTM OIL NO. 1(ASTM F 146, 5 h at 125 +/- 2 C)3.9.1 Compressibility 9 - 19
11、%3.9.2 Recovery, min 45 %3.9.3 Thickness Change - 2 to + 5 %3.9.4 Weight Change, max + 35 %3.10 RESISTANCE TO ASTM OIL NO. 3(ASTM F 146, 5 h at 125 +/- 2 C)3.10.1 Compressibility 9 - 19 %3.10.2 Recovery, min 45 %3.10.3 Thickness Change - 1 to + 6 %3.10.4 Weight Change, max + 40 %3.11 SUPPLIERS RESPO
12、NSIBILITYAll materials supplied to this specification 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 unde
13、r 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 of the Materials Engineeringac
14、tivity. Test data, test samples and a new code identification areto be submitted with the request.Substance restrictions imposed by law, regulations or Ford isap plicable to the materials addressed by this document. Therestrictions are defined in Engineering Material SpecificationWSS-M99P9999-A1, un
15、less a different suffix (e.g., A2 or A3) isspecified on the engineering document for the application.4. APPROVAL OF MATERIALSMat erials defined by this specification must have prior approval by theresponsible Materials Engineeri ng activity. Suppliers desiring approval ofthe ir materials shall first
16、 obtain an expression of interest from theaffect ed Purchasing, Design and Materials Engineering activity. Uponrequest, the supplier shall submit to the affected Materials Engineeringactivity its own laboratory rep ort to the specification (test results, notnominal values), the material designation and code number, and testspecimen s for Ford evaluation. Upon approval, the material will be addedto the Engineering Material Approved Source List.
