1、 ENGINEERING MATERIAL SPECIFICATIONMaterial Name Specification NumberDate Action Changes1996 01 26 Activated D. Henrickson LAGWP 3948-a Page 1 of 4 WEBBING, POLYPROPYLENE, STAY PAD WSS-M7H55-A1. SCOPEThe material defined by this specification is a solution dyed polypropylenewebbing woven with contin
2、uous filament yarns and finishe d selvages. Properdyes a nd dyeing procedures shall be employed to provide acceptable color,app earance, and physical properties. This webbing may have a surfacefin ish applied in order to meet all requirements of this specification.Color stripping for redyeing of web
3、bing rejected for col or is not approved.The webbing shall be of good quality and uniform construction.2. APPLICATIONThis s pecification was released originally for and restricted to materialused as a stay pad support in convertible tops.3. REQUIREMENTS3.1 QUALITY SYSTEM REQUIREMENTSMaterial supplie
4、rs 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 Material
5、s 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 mate
6、rials 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
7、.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 condition
8、s.ENGINEERING MATERIAL SPECIFICATIONWSS-M7H55-AWP 3948-b Page 2 of 4 3.3 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
9、the same conditions unless otherwise specified.3.4 APPEARANCE(FLTM BI 109-01)The color, pattern, and finish shall match the approved sample, orshall be as specified on the engineering drawing.Note: This webbing is to be manufactured in a four-panel weaveconstruction.3.5 THICKNESS 0.97 +/- 0.15 mm(SA
10、E J882)3.6 WIDTH As specified onengineeringMeasured at less than 22 N load drawing3.7 COMPOSITION(ASTM D 629)Polypropylene 100 %3.8 BREAKING STRENGTH, min(ASTM D 5034, Grab Method)Warp direction 3 100 NFill direction 1 325 N3.9 RESISTANCE TO FADE, min Rating 3(SAE J1885, 150.4 kJ/m2, AATCC Evaluatio
11、nProcedure 1)No individual yarn or combination of yarns shall fade, stain orexhibit any color tone change, nor shall the yarns change in hue orbrightness in excess of the above ratings.3.10 COLORFASTNESS TO CROCKING, WET AND DRY, min Rating 3(FLTM BN 107-01, AATCC Evaluation Procedure 3)3.11 COLORFA
12、STNESS TO STAINING-BLEEDING, min Rating 3(FLTM AN 101-01, AATCC Evaluation Procedure 3)3.12 COLORFASTNESS TO STAINING-PERSPIRATION, min Rating 3(FLTM AN 101-01, AATCC Evaluation Procedure 3)ENGINEERING MATERIAL SPECIFICATIONWSS-M7H55-AWP 3948-b Page 3 of 4 3.13 FOGGING(SAE J1756, 3 h at 100 C heatin
13、g, 21 C coolingplate, post test conditioning 1 h)Fog Number, min 70Formation of clear film, droplets or crystals is cause forrejection.3.14 FLAMMABILITY(ISO 3795/SAE J369)Burn Rate, max 100 mm/minute3.15 ADDITIONAL REQUIREMENTSSpecific requirements for material and/or manufactured parts shallbe spec
14、ified on the Engineering drawing, Engineering partsspecification and/or performance specification. All critical areaswith respect to these properties shall be clearly designated on theengineering drawing.3.16 SUPPLIERS RESPONSIBILITYAll materials supplied to this specification must be equivalent ina
15、l 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 this specification, whether or not suchchange s affect the materials ability
16、 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 be submit
17、ted 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.ENGINEERING MATERIAL SPECIFICATIONWSS-M7H55-AWP 3948-b Page 4 of 4 4. APPROVAL OF MATE
18、RIALSMat 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 theaffec ted Purchasing, Design and Materials Engineering activity. Uponrequest,
19、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 compliance with all the requirements of this specification (testresults, not nominal
20、 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.
