1、 ENGINEERING MATERIAL SPECIFICATIONMaterial Name Specification NumberDate Action Changes1995 05 22 Activated D. Whyte B. ChenWP 3948-a Page 1 of 4 FABRIC, NONWOVEN, STITCH BONDED BLACK POLYESTER WSS-M9H141-A1. SCOPEThe material defined by this specification is a black stitch bondedpolyester fabric o
2、f good quality and uniform composition.2. APPLICATIONThis specification was released originally for material used as seatbac king material in commercial trucks. Any other application must beapproved by the Materials Engineering Activity.3. REQUIREMENTS3.1 QUALITY SYSTEM REQUIREMENTSMaterial supplier
3、s and part producers must conform to Quality SystemRequirements, QS-9000. Material specification r equirements are to beused fo r initial qualification of materials. A Control Plan forong oing production verification is required. This plan must bereviewed and approved b y the relevant Ford Materials
4、 activity and/orFor d Supplier Technical Assistance (STA) prior to production partssubmission. Appropriate statistical tools must be used to analyzepr ocess/product data and assure consistent processing of thematerials.Part producers using this material in their products, must use Fordapproved mater
5、ials 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/ortherma l analysis of material/parts supplied to this specification.
6、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 spectraand thermograms that correspond to the reference standard when testedunder the same conditions
7、.3.3 CONDITIONING AND TEST CONDITIONSAll test values indicated herein are based on ma terial conditioned ina control led atmosphere of 23 +/- 2 C and 50 +/- 5 % relativehumidity for not less than 24 h prior to testing and tested under thesame conditions unless otherwise specified.ENGINEERING MATERIA
8、L SPECIFICATIONWSS-M9H141-AWP 3948-b Page 2 of 4 3.4 COMPOSITION 100 % polyester(ASTM D 629)3.5 YARN SIZE(ASTM D 1244)Stitching Yarn 2.5 dtex (polyester, filament)3.6 CONSTRUCTION3.6.1 Fiber Size and Description(ASTM D1244)Web 0.25 tex (polyester, staple)3.7 WEIGHT, min 130 g/m2(FLTM BN 106-01)3.8 B
9、REAKING STRENGTH, min(ASTM D 5034, Grab Method, avg. of 5 tests,each direction)MD 395 NAMD 245 N3.9 TEAR STRENGTH (Trapezoid), min(ASTM D 1117, Integration method*,avg. of 5 tests, each direction)MD 60 NAMD 75 N*I ntegration method as approved by the Materials EngineeringActivity.3.10 HEAT SHRINKAGE
10、 AND EXPANSION, max(FLTM BN 105-01, except expose for15 minutes at 100 +/- 2 C)MD +/- 1.5 %AMD +/- 1.5 %3.11 FOGGING(FLTM BO 116-03)Fog Number, min 60Formati on of a clear film, droplets or crystals is cause forrejection.ENGINEERING MATERIAL SPECIFICATIONWSS-M9H141-AWP 3948-b Page 3 of 4 3.12 STRETC
11、H AND SET, %, range(FLTM SAE J855)stretch setMD 0 - 25 0 - 12AMD 0 - 25 0 - 123.13 SEAM STRENGTH, min(FLTM BN 119-01, avg. of 5 samples)MD 370 NAMD 310 N3.14 RESISTANCE TO WICKING None(SAE J913, 4 h immersion)3.15 FLAMMABILITY(ISO 3795/SAE J369)Burn rate, max 100 mm/minute3.16 ADDITIONAL REQUIREMENT
12、SSpecific 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 tothese properties shall be clearly designated on the engineeringdrawing.3.17 SUPPLIERS RESPO
13、NSIBILITYAll 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,constr uction, color, processing or labeling of the materialorig inally approved under
14、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 of the proposed changesand obtain the written approval of the Materials Engineeringacti
15、vity. 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 restrictions aredefined in Engineering Materials Specification WSS-M99P9999-A1.ENGINEERIN
16、G MATERIAL SPECIFICATIONWSS-M9H141-AWP 3948-b Page 4 of 4 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 interest from thea
17、ffec 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, demonstratingful l complia
18、nce 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.
