1、 ENGINEERING MATERIAL SPECIFICATIONMaterial Name Specification NumberDate Release No. Released1995 01 31 C10460360 Released B2, Updated J.W. Williams1992 12 07 C10260407 Released J. JoshiWP 3948-a Page 1 of 3 CORD, PIPING, THREE PLY, COTTON WSD-M6H36-BWSD-M6H36-B21. SCOPEThe material defined by this
2、 specification is a three pl y unfinished cottontwine.2. APPLICATIONThese specifications were released originally as piping cord for soft,fabric covered welt in seat cover applications.3. REQUIREMENTS3.1 STATISTICAL PROCESSSupplie rs must conform to the requirements of Ford Quality SystemStand ard Q
3、101. A mutually acceptable 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 M
4、otor 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 kept on file at thedesignated material laboratory. All samp
5、les sha ll produce IR spectraand 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 ma terial conditioned ina control led atmosphere of 23 +/- 2 C and 50 +/- 5 % relativehumidity
6、 for not less than 24 h prior to testing and tested under thesame conditions unless otherwise specified.ENGINEERING MATERIAL SPECIFICATIONWSD-M6H36-B/B2WP 3948-b Page 2 of 3 B B23.4 DIAMETER, mm, range 2.5 +/- 0.4 3.5 +/- 0.43.5 WEIGHT, g/m, min 2.7 5.53.6 COMPOSITION 100 % Cotton 100 % Cotton(ASTM
7、D 276)3.7 CONSTRUCTIONPly 3 3Twist S Twist Z/S Twist3.8 TWIST, turns/m, range S100 +/- 10 Z105 +/- 10(ASTM D 204) S75 +/- 103.9 CORD SIZE,tex,(nominal resultant) 2700 - 3200 5700 - 9100(ASTM D 204)3.10 TENSILE STRENGTH, N, min 250 450(ASTM D 204, configuration A,Test Speed: 125 mm/min)3.11 ELONGATIO
8、N AT BREAK, %, max 30 30(ASTM D 204, Configuration ATest Speed: 125 mm/min)3.12 COMPRESSION LOAD, N, max 75 75The test specimen must have no tension and there should be no changein the amount of twist in the plies of the cord.Test Method: Take 5 pieces approx. 150 mm long. Using a suitableco mpressi
9、on device, measure the thickness of the cord under 0.5 Npreload. Measure the lo ad required to compress the cord by 30 % at acompression rate of 10 mm/min.Cal culate the average of 5 compression load results. Report theaverage load.3.13 OBJECTIONABLE CONTAMINANTSThe mat erial shall be free from any
10、contaminants which might causecontact staining of the trim cover material. Their shall be noevidence of staining when tested in accordance with FLTM AN 101-03.3.14 ODOUR, max Rating 2(FLTM BO 131-01)ENGINEERING MATERIAL SPECIFICATIONWSD-M6H36-B/B2WP 3948-b Page 3 of 3 3.15 FOGGING(FLTM BO 116-03, 3
11、hours, 100 C)Fog Number, min 60Formati on of a clear film, droplets or crystals is cause forrejection.3.16 FLAMMABILITY(ISO 3795/SAE J369)Burn Rate, max 100 mm/min3.17 SUPPLIERS RESPONSIBILITYAll materials supplied to this specification must be equivalent inal l characteristics to the material upon
12、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 specificationrequir ements,
13、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.Substance restrictio
14、ns imposed by law, regulations or Ford, apply tothe materials addressed by this document. The restrictions 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 Engineer
15、ing activity. Suppliers desiring approvalof thei r materials shall first obtain an expression of 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
16、 test reports, signed by aqualified and authorized representative of the test faci lity, demonstratingful 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.
