1、 ENGINEERING MATERIAL SPECIFICATIONMaterial Name File Control Number Specification NumberDate Release No. Release/Revision1988 11 30 SM/EQ9496 TP Released M. SiewertWP 3948-a Page 1 of 4 GASKET, ARAMIDE FIBERS AND NBR SMT5008GA8550 WSK-M8G172-A21. SCOPEThe ma terial defined by this specification is
2、a gasket material comprisedof aramide fibers bonded with nitrile butadiene rubber (NBR).2. APPLICATIONThis sp ecification was released originally for material used for enginegaskets.3. REQUIREMENTSNote : All tests shall be conducted in accordance with ASTM F 104 Type 1material unless otherwise speci
3、fied. The requirements of this specificationare va lid for gasket material of 0.2 to 1.6 mm thickness. Test specimensare to be selected from finished gaskets when practicable.Prior to testing the materials shall be conditioned in an oven at 100 +/-2 C for 1 hour and allowed to cool to 23 +/- 2 C in
4、a de siccator containinganhydrous calcium chloride.3.1 STATISTICAL PROCESSSupplie rs must conform to the requirements of Ford Quality SystemSt andard Q-101. A mutually acceptable Control Plan as describedthere in is required for materials/source approval. Appropriatestatist ical tools must be used t
5、o analyse 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 material/parts supplied to this specification.The IR spectra and ther
6、mogram established for initial approval shallconst itute the reference standard and shall be kept on file at thedesignated material laboratory. All samples sha ll produce IR spectraand thermogram that cor respond to the reference standard when testedunder the same conditions.ENGINEERING MATERIAL SPE
7、CIFICATIONWSK-M8G172-A2WP 3948-b Page 2 of 4 Thickness Thickness0.2 - 0.5 mm 0.6 - 1.6 mm3.3 ORIGINAL PROPERTIES3.3.1 Density 1.55 - 1.70 g/cm3 1.55 - 1.65 g/cm3(ASTM D 297)3.3.2 Ignition Loss 32 - 38 % 32 to 38 %(ASTM F 495)3.3.3 Tensile Strength, min 12 MPa 16 MPa(ASTM F 152 Method A)3.3.4 Compres
8、sibility 8 - 15 % 8 - 14 %(ASTM F 36 Procedure A)3.3.5 Recovery, min 45 % 50 %(ASTM F 36 Procedure A)3.4 SEALABILITY, max 1.5 mL/h 1.5 mL/h(ASTM F 37, Method A, ASTMFuel A, 6.9 MPa flange load,1.7 MPa internal pressure)3.5 CREEP RELAXATION, max 40 % 40 %(ASTM F 38, Method B, 22 hat 150 +/- 2 C)3.6 A
9、DHESION AND CORROSION(FLTM BV 123-1)3.6.1 After Heat Aging at 150 +/- 2 CAdhesion, max Rating 2 Rating 2Corrosion, max Rating 2 Rating 23.6.2 After Aging in Humidity CabinetAdhesion, max Rating 2 Rating 2Corrosion, max Rating 2 Rating 23.7 HEAT AGING(ASTM D 573, 22 h at 150 +/- 2 C)3.7.1 Weight chan
10、ge - 2 to + 2 % - 2 to + 2 %3.7.2 Compressibility 9 - 14 % 7 - 12 %3.7.3 Recovery, min 45 % 55 %ENGINEERING MATERIAL SPECIFICATIONWSK-M8G172-A2WP 3948-b Page 3 of 4 Thickness Thickness0.2 - 0.5 mm 0.6 - 1.6 mm3.8 RESISTANCE TO ASTM OIL No.1(ASTM F 146, 5 h at 150 +/- 2 C)3.8.1 Thickness Change 0 to
11、+ 3 % 0 to + 2 %3.8.2 Compressibility 8 - 12 % 6 - 10 %3.8.3 Recovery, min 45 % 55 %3.9 RESISTANCE TO ASTM OIL No. 3(ASTM F 146, 5 h at 150 +/- 2 C)3.9.1 Thickness Change + 2 to + 6 % 0 to + 4 %3.9.2 Compressibility 10 - 16 % 6 - 12 %3.9.3 Recovery, min 45 % 55 %3.10 RESISTANCE TO ASTM FUEL C + METH
12、ANOL(85 vol. % Fuel C + 15 vol. % methanol)(ASTM F 146, 22 h at 23 +/- 2 C)3.10.1 Thickness Change + 20 to + 30 % + 20 to + 30 %3.11 RESISTANCE TO COOLANT & WATER (50:50)Test methodImme rse in Engine coolant WSE-M97B44-D and/or approved coolant ofaffected model year (see para 5.1) and distilled wate
13、r (50:50 Vol. %)by using a suitable distilation flask and a reflux condenser for 70hours at boiling temperature.3.11.1 Thickness Change + 6 to + 10 % + 4 to + 8 %3.11.2 Compressibility 25 - 40 % 25 - 40 %3.11.3 Recovery, min 25 % 30 %3.12 SUPPLIERS RESPONSIBILITYAll materials supplied to this specif
14、ication must be equivalent inal l characteristics to the material upon which approval wasoriginally granted.ENGINEERING MATERIAL SPECIFICATIONWSK-M8G172-A2WP 3948-b Page 4 of 4 Pri or to making any change in the properties, composition,co nstruction, color, processing or labelling of the materialori
15、g 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 of the M
16、aterials 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 Material Specification WS
17、S-M99P9999-A1, unlessa different suffix (e.g., A2 or A3) is specified on the engineeringdocument 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 mater
18、ials shall first obtain an expression of interest from theaffec ted 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 mater
19、ial designation and code number, and testspecim ens for Ford evaluation. Upon approval, the material will be addedto the Engineering Material Approved Source List.5. GENERAL INFORMATIONThe i nformation below is provided for clarification andd assistance inmeeting the requirements to the specificatio
20、n.5.1 For i nformation on currently approved engine coolants for use inmeeting the requirements to the specification.Materials Laboratory 13/100 Fluids Material SectionResearch and Engineering Centre Coolants/GreasesFord Motor Company Ltd Engine EngineeringLaindon, Basildon PO Box 2053Essex SS15 6EE, England 21500 Oakwood BoulevardDearborn, MI 48121, USAMaterials EngineeringProduct Engineering OfficeFord Motor Co. of Australia LtdPinces Highway, NorlaneVictoria 3214, Australia
