1、 ENGINEERING MATERIAL SPECIFICATIONMaterial Name Specification NumberDate Release No. Release/Revision1991 01 24 CE0010109215013 Added A4, Revised & Retyped C. Gray1979 05 18 CH8H-RD-834180 Released R.H. HannumWP 3948-a Page 1 of 3 SCREEN, NYLON, MONOFILAMENT, 275 MICROMETRE MESH OPENING ESH-M9H99-A
2、1 SCREEN, NYLON, MONOFILAMENT, 350 MICROMETRE MESH OPENING ESH-M9H99-A2SCREEN, NYLON, MONOFILAMENT, 350 MICROMETRE MESH OPENING ESH-M9H99-A3SCREEN, NYLON, MONOFILAMENT, 132 MICROMETRE MESH OPENING ESH-M9H99-A41. SCOPEThe materials defined by these specifications are woven screens constructedin a pla
3、in square weave using nylon monofilament thread.2. APPLICATIONThese specifications were relea sed originally for materials used in filterassemblies in A/C refrigerant lines.3. REQUIREMENTS3.1 STATISTICAL PROCESSSupplie rs must conform to the requirements of Ford Quality SystemStand ard Q-101. A mutu
4、ally 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 Motor Company
5、 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 samples sha ll p
6、roduce 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 for not les
7、s than 24 h prior to testing and tested under thesame conditions unless otherwise specified.ENGINEERING MATERIAL SPECIFICATIONESH-M9H99-A1/A2/A3/A4WP 3948-b Page 2 of 3 A1 A2 A3 A43.4 COMPOSITION Nylon 6/6 Nylon 6 Nylon 6/6 Nylon 6/63.5 SPECIFIC GRAVITY 1.13-1.15 1.13-1.15 1.13-1.15 1.13-1.15(ASTM D
8、 792)3.6 MELTING POINT, 255 225 250 250C, min(FLTM BO 21-2)3.7 MESHING OPENING, 261-289 332-368 337-373 112-148micrometre3.8 THREAD DIAMETER, 114-126 209-231 152-168 62-78micrometre3.9 MESH COUNT, mm 24-26/10 16-18/10 18-20/10 48-51/103.10 WEIGHT, g/m2 58-72 153-187 84-104 47-513.11 ADDITIONAL REQUI
9、REMENTSSpecific requirements for material and/or manufa ctured parts shall bespecified on the Engineering drawing, Engineerin g parts specificationand/or performance specifications. All critical areas with respect tothese properties shall be clearly designated on the engineeringdrawing.3.12 SUPPLIER
10、S 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,constr uction, color, processing or labeling of the materialorig inally approved
11、 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 of the proposed changesand obtain the written approval of the Materials Engineer
12、ingactivity. 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 Material Specification WS S-M99P9999-A1, un
13、lessa different suffix (e.g., A2 or A3) is specified on the engineeringdocument for the application.ENGINEERING MATERIAL SPECIFICATIONESH-M9H99-A1/A2/A3/A4WP 3948-b Page 3 of 3 4. APPROVAL OF MATERIALSMat erials defined by this specification must have prior approval by theresponsible Materials Engin
14、eeri ng activity. Suppliers desiring approval ofthe ir 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 labora
15、tory 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 i ntended processes and/or applications. Uponapprov al, the material will be added to the Engineering Material ApprovedSource List.
