1、 ENGINEERING MATERIAL SPECIFICATIONMaterial Name File Control No. Specification NumberDate Action Changes1988 11 30 SM/EQ9496 TP Released M. SiewertWP 3948-a Page 1 of 4 GASKET, CORK/RUBBER (NBR) SMT5008GA8570 WSK-M8G220-A2HIGH HEAT RESISTANT1. SCOPEThe ma terial defined by this specification is a g
2、asketing materialcomprised of cork granule and NBR binder.2. APPLICATIONThis specification was released originally for material used for rocker armcover gaskets.3. REQUIREMENTSNote : All tests shall be conducted in accordance with ASTM F 104 Type 2material unless otherwise specified. The requirement
3、s of this specificationare va lid for gasket material of 1.5 to 5.0 mm thickness. Test specimensare to be selected from finished gaskets when practicable.Prior to testing the materials shall be conditioned for at least 46 h ina cont rolled humidity room at 23 +/- 2 C and 50 +/- 5% relative humidity.
4、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 to analyse process/product data sothat variation in
5、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 mogram established for initial approval shallconst
6、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 SPECIFICATIONWSK-M8G220-A2WP 3948-b Page 2 of 4 3.3 OR
7、IGINAL PROPERTIES3.3.1 Density 0.85 - 0.95 g/cm3(ASTM D 297)3.3.2 Tensile Strength, min 2.8 MPa(ASTM F 152, Method B)3.3.3 Compressibility 16 to 24 %(ASTM F 36, Procedure B)3.3.4 Recovery, min 80 %(ASTM F 36, Procedure B)3.4 SEALABILITY, max tbe(ASTM F 37, 2.8 MPa flange load, 1.7 MPainternal pressu
8、re)3.5 CREEP RELAXATION, max tbe(ASTM F 38, Method B, 22 h at 125 +/- 2 C.)3.6 ADHESION AND CORROSION(FLTM BV 123-1, except M8 screw and nut,torque 15 +/- 2 Nm)3.6.1 After Heat Aging at 125 +/- 2 C3.6.1.1 Adhesion, max Rating 23.6.1.2 Corrosion, max Rating 23.6.2 After Aging in Humidity Cabinet3.6.2
9、1 Adhesion, max Rating 23.6.2.2 Corrosion, max Rating 23.7 DIMENSIONAL STABILITYTest Method: Cut twelve 2.5 x 20 cm specimens. Precondition samplesfor 24 h at 50 +/- 5 % relative humidity and 23 +/- 2 C. Afterprecond itioning measure the length of each test specimen. Place 6specimens in a tray of d
10、e-ionized water to a dep th of 1.2 cm for a 22h per iod. Remove specimens from water, immediately lightly blotexcess water from the surface and immediately remeasure the length.Place the 6 remaining specimens in a recirculating hot air oven at100 +/- 2 C for 5 h. Remove from oven and place immediate
11、ly in adesiccator containing anhydrous calcium chloride. Cool to roomtemperature, remove and immediately remeasure the length.3.7.1 High Humidity Test + 1.5 %Length Change, max3.7.2 Low Humidity Test - 1.5 %Length Change, maxENGINEERING MATERIAL SPECIFICATIONWSK-M8G220-A2WP 3948-b Page 3 of 4 3.8 HE
12、AT AGING(ASTM D 573 168 h at 125 +/- 2 C)3.8.1 Compressibility 12 to 20 %3.8.2 Recovery, min 80 %3.8.3 Flexability 5 X thickness(ASTM F 147)3.9 RESISTANCE TO ASTM OIL No.1(ASTM F 146, 168 h at 125 +/- 2 C)3.9.1 Compressibility 16 to 24 %3.9.2 Recovery, min 80 %3.9.3 Volume change, max - 10 %3.9.4 Fl
13、exability 5 X thickness3.10 RESISTANCE TO ASTM OIL No. 3(ASTM F 146, 168 h at 125 +/- 2 C)3.10.1 Compressibility 22 to 30 %3.10.2 Recovery, min 80 %3.10.3 Volume change, max + 15 %3.10.4 Flexability 5 X thickness3.11 SUPPLIERS RESPONSIBILITYAll materials supplied to this specification must be equiva
14、lent inal l characteristics to the material upon which approval wasoriginally granted.Pri or to making any change 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 material
15、s 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 Engineeringactivity. Test data, t est samples and a new code identification areto
16、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 S-M99P9999-A1, unlessa different suffix (e.g., A2 or A3) is specified on the engineeringdoc
17、ument for the application.ENGINEERING MATERIAL SPECIFICATIONWSK-M8G220-A2WP 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 obtai
18、n 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 material designation and code number, and testspecim ens for Ford evaluation. Upon approval, the material will be addedto the Engineering Material Approved Source List.
