1、 ENGINEERING MATERIAL SPECIFICATIONMaterial Name Specification NumberDate Release No. Released1994 12 07 Revised and Retyped1988 02 29 SM/EQ2386TP ReleasedWP 3948-a Page 1 of 4 GASKET, CORK AND NBR/SBR RUBBER ESK-M8G217-A1. SCOPEThe mate rial defined by this specification is a granulated cork materi
2、albonded with NBR/SBR rubber compound.2. APPLICATIONThis specification was released originally for material used for sealingstrips of intake manifold gaskets.3. REQUIREMENTS3.1 STATISTICAL PROCESSSupplie rs must conform to the requirements of Ford Quality SystemStand ard Q-101. A mutually acceptable
3、 Control Plan as describedtherein 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 ANALYSISFord Motor Company, at its option
4、, 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 laboratory. All samples sha ll produce IR spect
5、raand thermograms that correspond to the reference standard when testedunder the same conditions.3.3 CONDITIONING AND TEST CONDITIONSAll test values indicated herein are based on material conditionedaccording to ASTM F 104, material type 2, prior to testing and testedunder the same conditions unless
6、 otherwise specified.3.4 TEST SPECIMENS (Test Sheets)The requirements of thi s specification are valid for gasket materialof 2.0 - 4.0 mm thickness.Note: All tests shall be carried out on sample sheets with a nominalthickness as specified on Engineering drawing.ENGINEERING MATERIAL SPECIFICATIONESK-
7、M8G217-AWP 3948-b Page 2 of 4 3.4.1 Density 0.45 - 0.55 g/cm3(ASTM D 297)3.4.2 Hardness, Durometer A 44 - 52(ASTM D 2240, test specimens to beplied up to a minimum thickness of6 mm)3.4.3 Tensile Strength, min 0.6 MPa(ASTM D 152, procedure accordingto Method B, test specimen size:25 x 100 mm)3.4.4 Co
8、mpressibility and Recovery(ASTM F 36, procedure B)3.4.4.1 Compressibility 24 - 32 %(0.7 MPa load)3.4.4.1.1 Recovery, min 80 %3.4.4.2 Compressibility 50 - 60 %(2.8 MPa load)3.4.4.2.1 Recovery, min 75 %3.4.5 Heat Ageing, 168 h at 120 +/- 2 C(ASTM D 573; after aging specimens areto be conditioned for 2
9、4 h +/- 1 haccording to para 3.3)3.4.5.1 Tensile Strength, Change + 20 to + 80 %3.4.5.2 Compressibility 44 - 54 %(ASTM F 36, procedure B,2.8 MPa load)3.4.5.3 Recovery, min 80 %3.4.6 Immersion in ASTM Oil No.1,168 h at 120 +/- 2 C(ASTM F 146)3.4.6.1 Tensile Strength, Change - 20 to + 30 %3.4.6.2 Comp
10、ressibility 52 - 62 %(ASTM F 36, procedure B,2.8 MPa load)3.4.6.3 Recovery, min 75 %3.4.6.4 Volume, Change - 5 to + 5 %ENGINEERING MATERIAL SPECIFICATIONESK-M8G217-AWP 3948-b Page 3 of 4 3.4.7 Immersion in ASTM Oil No. 3,168 h at 120 +/- 2 C(ASTM F 146)3.4.7.1 Tensile Strength, Change - 80 to - 40 %
11、3.4.7.2 Volume, Change - 5 to + 20 %3.4.8 FlexibilityNo cracks, breaks or surface separation.3.4.8.1 Original material3.4.8.2 Ma terial after being subjected to heat agingaccording to para 3.4.5.3.4.8.3 Material after being subjected to immersion in ASTMOil No. 1 according to para 3.4.6.3.4.8.4 Mate
12、rial after being subjected to immersion in ASTMOil No. 3 according to para 3.4.7.Test Method: Three test specimens (25 x 200 mm)shal l be subjected to each above mentioned testcondition. Mandrel diameter shall be 5 times thethickness of material. The specimens shall be bentaround the mandrel within
13、5 +/- 1 seconds.3.4.9 Compression Set, max 75 %(ASTM D 395, Method A, 70 h at100 +/- 2 C)3.4.10 Ozone Resistance, max Rating “1“(FLTM EU-BP 1-1, except elongationto be 10 %)3.4.11 Dimensional StabilityTe st Method: Three test specimens (25 x 200 mm) are to becondit ioned according to para 3.3. Speci
14、mens are thenme asured for original length. Expose vertically hung testspeci mens in a controlled temperature and humidity chamberfor 7 days a t 38 +/- 1 C and 98 +/- 2 % relative humidity,fol lowed by 7 days at 38 +/- 1 C and 15 - 20 % relativehumidity. Length of test specimens is measured after ea
15、ch ofthese two 7 day exposure periods. Average % cha nge in lengthafte r each exposure is calculated, based on the originallength previously determined.3.4.11.1 After 7 d at 38 C and 98 +/- 2 %Relative Humidity, max + 1.5 %ENGINEERING MATERIAL SPECIFICATIONESK-M8G217-AWP 3948-b Page 4 of 4 3.4.11.2
16、After 7 d at 38 C and 15 - 20 %Relative Humidity, max - 1.5 %3.5 ADDITIONAL REQUIREMENTSSpecific requirements for material and/or manufa ctured parts shall bespecified on the Engineering drawing, Engineerin g parts specificationand/or performance specification. All critical areas with respect tothes
17、e properties shall be clearly designated on the engineeringdrawing.3.6 SUPPLIERS RESPONSIBILITYAll materials supplied to this specification must be equivalent inal l characteristics to the material upon which approval wasoriginally granted.Pri or to making any change in the properties, composition,c
18、onstr 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 specificationrequir ements, the Supplier shall notify Purchasing, Toxicology andthe affected Materials Engineering activity o
19、f 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.Substance restrictions imposed by law, regulations or Ford, apply tothe materials addressed by this document. The res
20、trictions aredefined in Engineering Materials Specification WSS-M99P9999-A1.4. APPROVAL OF MATERIALSMat erials defined by this specification must have prior approval by theresp onsible Materials Engineering activity. Suppliers desiring approvalof thei r materials shall first obtain an expression of
21、interest from theaffec ted Purchasing, Design and Materials Engineering activity. Uponrequest, the Supplier shall submit to the affected Materials Engineeringactivity a completed copy of their laboratory test reports, signed by aqualified and authorized representative of the test faci lity, demonstr
22、atingful l compliance with all the requirements of this specification (testresults, not nominal values), the material designation a nd code number, andtes t specimens for Ford evaluation. Fords engineering approval of amateri al will be based on its performance to this specification and on anassessment of suitability for intended processes and/or applications. Uponapprov al, the material will be added to the Engineering Material ApprovedSource List.
