1、 ENGINEERING MATERIAL SPECIFICATIONMaterial Name Specification NumberDate Action Changes1990 08 01 EP00E01031538000 Released M. SiewertWP 3948-a Page 1 of 4 GASKET, SYNTHETIC FIBERS, CORK MEAL, NBR/SBR WSK-M8G236-ABINDER1. SCOPEThe ma terial defined by this specification is a gasket material compris
2、edof a c ombination of cellulose/polyacrylonitrile fibers and cork meal withNBR/SBR binder.2. APPLICATIONThis specification was released originally for gasket ma terial used for therear axle shaft.3. REQUIREMENTS3.1 STATISTICAL PROCESSSupplie rs must conform to the requirements of Ford Quality Syste
3、mStanda 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 THERMAL A
4、NALYSISFord 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 ora
5、tory. 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 shall be conditio ned for 4 h at 23 +/-2 C i n a closed chamber containing anhydrous calcium chl
6、oride 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.All tests shall be conducted in accordance wit
7、h ASTM F 104 Type 3materia l unless otherwise specified. The requirements of thisspecifi cation are valid for gasket material of 0.7 to 3.0 mmthickness. Test specimens are to be selected from finished gasketswhen practicable.ENGINEERING MATERIAL SPECIFICATIONWSK-M8G236-AWP 3948-b Page 2 of 4 3.4 CON
8、STRUCTIONCork meal impregnated with NBR/SBR binder and reinforced withcellulose/polyacrylonitrile fibers.THICKNESS, mm 0.7 - 1.5 1.6 - 3.03.5 ORIGINAL PROPERTIES3.5.1 Density, g/cm3 1.13 - 1.17 1.10 - 1.14(ASTM D 297)3.5.2 Tensile Strength, MPa, 5.5 3.5min(ASTM F 152, Method C)3.5.3 Compressibility,
9、 % 13 - 23 14 - 26(ASTM F 36, Procedure G)3.5.4 Recovery, %, min 40 40(ASTM F 36, Procedure G)3.6 SEALABILITY, mL/h, max 0.25 0.25 (ASTM F 37, Method A, ASTM Fuel A, 6.9 MPa flange load, 0.7 Mpa internal pressure)3.7 CREEP RELAXATION, %, max 40 70 (ASTM F 38, Method B, 22 h at 125 +/- 2 C)3.8 ADHESI
10、ON AND CORROSION(FLTM BV 123-01)3.8.1 After Heat Aging at 125 +/- 2 CAdhesion, Rating, max 2 2Corrosion, Rating, max 2 23.8.2 After Aging in Humidity CabinetAdhesion, Rating, max 2 2Corrosion, Rating, max 2 23.9 DIMENSIONAL STABILITY(ASTM F 1087)3.9.1 Dry Condition, Change, %, max - 1 - 1 3.9.2 Wet
11、Condition, Change, %, max + 1 + 1 ENGINEERING MATERIAL SPECIFICATIONWSK-M8G236-AWP 3948-b Page 3 of 4 THICKNESS, mm 0.7 - 1.5 1.6 - 3.03.10 HEAT AGING(ISO 188/ ASTM D 573, 150 +/- 50 air changes/h, 22 h at 125 +/- 2 C) 3.10.1 Compressibility, % 14 - 24 16 - 26 3.10.2 Recovery, %, min 40 40 3.10.3 We
12、ight change, % - 7 to + 2 - 7 to + 2 3.11 RESISTANCE TO ASTM OIL NO. 1(ASTM F 146, 5 h at 125 +/- 2 C)3.11.1 Compressibility, % 11 - 21 11 - 21 3.11.2 Recovery, %, min 40 40 3.11.3 Thickness Change, % + 2 to + 10 + 2 to + 10 3.11.4 Weight Change, % + 3 to + 25 + 3 to + 25 3.12 RESISTANCE TO ASTM OIL
13、 NO. 3(ASTM F 146, 5 h at 125 +/- 2 C)3.12.1 Compressibility, % 12 - 22 12 - 22 3.12.2 Recovery, %, min 40 40 3.12.3 Thickness Change, % 0 to + 18 0 to + 18 3.12.4 Weight Change, % + 8 to + 35 + 8 to + 35 3.13 SUPPLIERS RESPONSIBILITYAll materials supplied to this specification must be equivalent in
14、al 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 s affect the materials abil
15、ity 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 identification areto be subm
16、itted 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, unless a different suffix (e.g., A2 or A3) isspecified on the engineering doc
17、ument for the application.ENGINEERING MATERIAL SPECIFICATIONWSK-M8G236-AWP 3948-b Page 4 of 4 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 obtain
18、 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.
