1、 ENGINEERING MATERIAL SPECIFICATIONMaterial Name File Control No. Specification NumberDate Release No. Release/Revision1989-04-07 SM/EQ15817 TP Released M. SiewertWP 3948-a Page 1 of 4 GASKET, STEEL CORE, ARAMIDE FIBER SHEET SMT5008GA8750 WSK-M8G224-A1. SCOPEThe ma terials defined by this specificat
2、ion consist of a low carbon steelcore c overed equally on both sides with a synthetic rubber bonded aramidefiber fa cing. The assembly is coated with a barrier, anticorrosive andantistick coating.2. APPLICATIONThis specification was released originally for exhaust manifold gaskets.3. REQUIREMENTS3.1
3、 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 material/source approval. Appropriatestatist ical tools must be used to analyze process/product data sothat variation in the
4、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 thermograms established for i nitial approval shallconst itu
5、te 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 standard when testedunder the same conditions.3.3 CONDITIONING AND TEST CONDITIONSPrior to testing, the materials shall be c
6、onditioned in an oven at100 +/- 2 C for 1 h and allowed to cool to 23 +/ - 2 C in a desiccatorcontaining anhydrous ca lcium chloride. All tests shall be conductedin accordance with ASTM F 104, Type 1 material unless otherwisespeci fied. The requirements of this specification are valid forgasket mate
7、rial of 1.0 to 1.4 mm thickness. Tes t specimens are to beselected from finished gaskets when practicable.ENGINEERING MATERIAL SPECIFICATIONWSK-M8G224-AWP 3948-b Page 2 of 4 3.4 CONSTRUCTIONConsi sts of a low carbon steel sheet with a material consisting ofaramide fibers and synt hetic rubber bonded
8、 to each side of the steelsheet. The assembly is covered with a barrier anticorrosive sealingco at. Finally, an antistick coating is applied to the gasketassembly.3.4.1 Steel CoreLow ca rbon steel, thickness and finish as specified onEngineering Drawing.3.4.2 Facing MaterialThe aramide fiber sheet s
9、hall be plied uniformly and bondedto e ach side of the steel core to meet requirements of theap plication at the thickness specified on the EngineeringDrawing.3.4.3 CoatingsCoatings of gasket as specified on Engineering Drawing.3.5 ORIGINAL PROPERTIES3.5.1 Ignition Loss of Facing Material 13 - 18 %(
10、ASTM F 495)3.5.2 Compressibility 12 - 18 %(ASTM F 36, Procedure A)3.5.3 Recovery, min 45 %(ASTM F 36, Procedure A)3.6 SEALABILITY, max 16 mL/h(ASTM F 37, Method A, 3.5 MPa flange load,0.1 MPa internal pressure)3.7 CREEP RELAXATION, max 35 %(ASTM F 38, Method B, 22 h at 150 +/- 2 C.)3.8 ADHESION AND
11、CORROSION(FLTM BV 123-1)3.8.1 After Heat Aging at 150 +/- 2 CAdhesion, max Rating 2Corrosion, max Rating 2ENGINEERING MATERIAL SPECIFICATIONWSK-M8G224-AWP 3948-b Page 3 of 4 3.8.2 After Aging in Humidity CabinetAdhesion, max Rating 2Corrosion, max Rating 23.9 HEAT AGING(ASTM D 573, 22 h at 200 +/- 2
12、 C)3.9.1 Compressibility 10 - 16 %3.9.2 Recovery, min 35 %3.10 RESISTANCE TO ASTM OIL No.1(ASTM F 146, 5 h at 150 +/- 2 C)3.10.1 Thickness Change +3 to +9 %3.10.2 Compressibility 13 - 20 %3.10.3 Recovery, min 35 %3.10.4 After im mersion the facing material shall be firm and mustnot separate from the
13、 steel core.3.11 RESISTANCE TO ASTM OIL No.3(ASTM F 146, 5 h at 150 +/- 2 C)3.11.1 Thickness Change +5 to +12 %3.11.2 Compressibility 14 - 21 %3.11.3 Recovery, min 50 %3.11.4 After im mersion the facing material shall be firm and mustnot separate from the steel core.3.12 RESISTANCE TO ASTM 85% Fuel
14、C + 15% Methanol(ASTM F 146, 22 h at 23 +/- 2 C)3.12.1 Thickness Change +5 to +12 %3.12.2 Compressibility 14 - 21 %3.12.3 Recovery, min 50 %3.12.4 After im mersion the facing material shall be firm and mustnot separate from the steel core.3.13 RESISTANCE TO COOLANT & WATER (50:50)Test method: Immers
15、e in Engine coolant WSE-M97B44-D and distilledwater (5 0/50 vol. %) by using a suitable distillation flask and areflux condenser for 70 h at boiling temperature.3.13.1 Thickness Change +6 to +13 %3.13.2 Compressibility 14 - 23 %3.13.3 Recovery, min 45 %3.13.4 After im mersion the facing material sha
16、ll be firm and mustnot separate from the steel core.ENGINEERING MATERIAL SPECIFICATIONWSK-M8G224-AWP 3948-b Page 4 of 4 3.14 SUPPLIERS RESPONSIBILITYAll materials supplied to this specification must be equivalent inal l characteristics to the material upon which approval wasoriginally granted.Pr ior
17、 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 ability to meet the specificationrequir ements, the Supplier shall notify Purchasing, Tox
18、icology 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 submitted with the request.Substance restrictions imposed by law, regulations or Ford app
19、ly tothe mat erials addressed by this document. The restrictions aredefined in Engineering Material Specification WS 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 m
20、ust have prior approval by theresponsible Materials Engineeri ng activity. Suppliers desiring approval ofthe ir materials shall first obtain an expression of interest from theaffect ed Purchasing, Design and Materials Engineering activity. Uponrequest, the supplier shall submit to the affected Mater
21、ials 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. 5. GENERAL INFORMAT
22、IONThe information below is provided for clarification and assistance inmeeting the requirements to the specification.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
