1、 ENGINEERING MATERIAL SPECIFICATIONMaterial Name Specification NumberDate Action Changes1998 06 01 Revised Revise para 1, 3.4.3 K. Gerhards1997 11 12 Activated K. GerhardsWP 3948-a Page 1 of 4GASKET, STEEL CORE, NBR WSS-M8G252-A31. SCOPEThe material defined by this specification consists of a steel
2、corecovered equally on both sides with a carbon filled NBR, which isadditionally coated with an anti-blocking coating.2. APPLICATIONThi s specification was released originally as gasket between an aluminumcylinderhead and exhaust manifold flange.3. REQUIREMENTS3.1 QUALITY SYSTEM REQUIREMENTSMaterial
3、 suppliers and part producers must conform to Quality SystemRequirements, QS-9000. Material specification requirements are to beused for initial qualification of materials. A Control Plan forongoing production verification is required. This plan must bereviewed and approved by the relevant Ford Mate
4、rials activity and/orFord Supplier Technical Assistance (STA) prior to production partssubmission. Appropriate statistical tools must be used to analyzeprocess/product data and assure consistent processing of thematerials.Part producers using this material in their products, must use Fordapproved ma
5、terials and must conform to a process control plan whichhas been approved by STA and/or the relevant Materials Activity.3.2 INFRARED SPECTROPHOTOMETRY AND/OR THERMAL ANALYSISFord Motor Company, at its option, may conduct infrared and/or thermalanalysis of material/parts supplied to this specificatio
6、n. The IRspectra and thermograms established for initial approval shallconstitute the reference standard and shall be kept on file at thedesignated material laboratory. All samples shall produce IR spectraand thermograms that correspond to the reference standard when testedunder the same conditions.
7、ENGINEERING MATERIAL SPECIFICATION WSS-M8G252-A3WP 3948-b Page 2 of 43.3 CONDITIONING AND TEST CONDITIONSAll test values indicated herein are based on material conditionedin a controlled atmosphere of 23 +/- 2 C and 50 +/- 5 % relativehumidity for not less than 24 h prior to testing and tested under
8、the same conditions unless otherwise specified.3.4 COMPOSITION3.4.1 Steel CoreSteel, thickness and finish as specified on Engineeringdrawing.3.4.2 Coating ThicknessAs specified on Engineering Drawing.3.4.3 Anti-Blocking Coating Thickness 1 - 5 um(micron)3.5 ORIGINAL PROPERTIES3.5.1 Ash Content of Co
9、vering Material, max 43 %(TGA, 800 C, Ramp 20 C/minute,20 - 70 0 C N2, 700 - 800 C air)3.6 HEAT AGING(ASTM D 573, 22 h at 300 +/- 3 C)3.6.1 Weight Change, max 30 %3.6.2 Delamination (separate test for each ply)Test Method: Firmly hold the sample at 1 point on acircular mandrel of diameter 6.0 mm thi
10、ckness and forceslowly but firmly under finger pressure to contact thefull diameter of the mandrel. Failure shall be anycracks, breaks or surface separation or delamination atthe approximate time (5 +/- 1 s) required to flex thespecimen.3.7 RES ISTANCE TO ASTM OIL No. 1(ASTM F 146, 5 h at 150 +/- 2
11、C)3.7.1 Delamination(See para 3.6.2)ENGINEERING MATERIAL SPECIFICATION WSS-M8G252-A3WP 3948-b Page 3 of 43.8 RESISTANCE TO ASTM OIL No. 3(ASTM F 146, 5 h at 150 +/- 2 C)3.8.1 Delamination(See para 3.6.2)3.9 RESISTANCE TO ASTM Fuel C + Methanol(ASTM F 146, 22 h at 23 +/- 2 C, 85 volume %Fuel C + 15 v
12、olume % methanol)3.9.2 Delamination(See para 3.6.2)3.10 RESISTANCE TO COOLANT & WATER (50:50)(ASTM F 146)Test Method: Immerse the sample in engine coolant WSS-M97B44-D anddistilled water (50:50 Volume %). Use a suitable distillationflask and a reflux condenser and reflux for 70 hours at boilingtempe
13、rature.3.10.1 Delamination (See para 3.6.2)3.11 SUPPLIERS RESPONSIBILITYAll materials supplied to this specification must be equivalent inall characteristics to the material upon which approval wasoriginally granted.Prior to making any change in the properties, composition,construction, color, proce
14、ssing or labeling of the materialoriginally approved under this specification, whether or not suchchanges affect the materials ability to meet the specificationrequirements, the Supplier shall notify Purchasing, Toxicology andthe affected Materials Engineering activity of the proposedchanges and obt
15、ain the written approval of the MaterialsEngineering activity. Test data, test samples and a new codeidentification are to be submitted with the request.Substance restrictions imposed by law, regulations or Ford, applyto the materials addressed by this document. The regulations aredefined in Enginee
16、ring Materials Specification WSS-M99P9999-A1.ENGINEERING MATERIAL SPECIFICATION WSS-M8G252-A3WP 3948-b Page 4 of 44. APPROVAL OF MATERIALSMaterials defined by this specification must have prior approval by theresponsible Materials Engineering activity. Suppliers desiring approvalof their materials s
17、hall first obtain an expression of interest from theaffected 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 representati
18、ve of the test facility,demonstrating full compliance with all the requirements of thisspecification (test results, not nominal values), the materialdesignation and code number, and test specimens for Ford evaluation. Fords engineering approval of a material will be based on itsperformance to this specification and on an assessment of suitabilityfor intended processes and/or applications. Upon approval, the materialwill be added to the Engineering Material Approved Source List.
