1、 ENGINEERING MATERIAL SPECIFICATIONMaterial Name Specification NumberDate Action Changes1987 06 11 Released Larry Gullen 87 06 11WP 3948-a Page 1 of 3 GASKET, PERFORATED STEEL CORE - COMPRESSED ESL-M8G196-AGRAPHITE SHEET1. SCOPEThe ma terial defined by this specification consists of a perforated ste
2、elcore covered equally on both sides with a compressed graphite sheet.2. APPLICATIONThis sp ecification was released originally for material used where hightem perature resistance is paramount, such as a gasket for the resonatorinlet pipe in the exhaust system.3. REQUIREMENTS3.1 CONSTRUCTION3.1.1 St
3、eel CorePerforated steel, thickness and type as specified onengineering drawing.3.1.2 GraphiteTh e flexible graphite is compressed and plied uniformly toth e perforated steel core (both sides) to meet therequirements of the application at the thickness specified onthe engineering drawing.3.2 FINISHE
4、D GASKETAll test s shall be conducted in accordance with ASTM F 104 unlessotherwise specified.3.2.1 Immersion Tests3.2.1.1 Fuel BAfter 5 h After 5 hat 23 C at 150 CWeight Change, 15 30% maxThickness Change, 15 30% maxENGINEERING MATERIAL SPECIFICATIONESL-M8G196-AWP 3948-b Page 2 of 3 3.2.1.2 ASTM #3
5、 OilAfter 5 h After 5 hat 23 C at 150 CWeight Change, 15 30% maxThickness Change, 15 30% max3.2.2 Original Properties3.2.2.1 Compressibility 15 - 35 %(ASTM F 36, Procedure A)Recovery, min 15 %3.2.2.2 Creep Relaxation, max 15 %(ASTM F 38, Method B,22 h at 150 +/- 2 C)3.2.2.3 Peel Adhesion Must pass(2
6、5.4 x 150 mm specimen.The adhesion must be greaterthan the cohesive strengthof the graphite)3.2.2.4 Flexibility No cracking(25.4 x 150 mm specimen, 180deg bend around a 25.4 mmdia mandrel at 23 +/- 2 C)3.2.3 Heat Aged Properties(5 h at 700 +/- 20 C)3.2.3.1 Compressibility 20 - 40 %(ASTM F 36, Proced
7、ure A)Recovery, min 10 %3.2.3.2 Creep Relaxation, max 20 %(ASTM F 38, Method B,22 h at 150 +/- 2 C)3.2.3.3 Flexibility No cracking.(25.4 x 150 mm specimen, Slight180 deg bend around a 50 mm crazingdia mandrel at 23 +/- 2 C) allowedENGINEERING MATERIAL SPECIFICATIONESL-M8G196-AWP 3948-b Page 3 of 3 3
8、3 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 itute the reference standard and shall be
9、kept on file at thedesignated material laboratory. All samples sha ll produce IR spectraand thermograms that correspond to the reference standard when testedunder the same conditions.3.4 SUPPLIERS RESPONSIBILITYAll materials supplied to this specification must be equivalent inal l characteristics to
10、 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 materialorig inally approved under this specification, whether or not suchchange s affect the materials ability to meet the specifica
11、tionrequir 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, t est samples and a new code identification areto be submitted with the request.S
12、ubstance restrictions imposed by law, regulations or Ford, apply tothe materials 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. AP
13、PROVAL 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 an expression of interest from theaffec ted Purchasing, Design and Materials Engineering activity.
14、 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 testspecim ens for Ford evaluation. Upon approval, the material will be addedto the Engineering Material Approved Source List.
