1、 ENGINEERING MATERIAL SPECIFICATION Material Name Specification Number Date Action Changes 2009 07 28 N-STATUS No Replacement Named Y. Bankowski, NARevised, Retyped 1976 04 07 AF1-6000-174 Released WP 3948-a Page 1 of 3 ACETAL RESIN, 15% PTFE FILLED ESB-M4D169-A2 NOT TO BE USED FOR NEW DESIGN 1. SCO
2、PE The material defined by this specification is a 15% particulate polytetrafluoroethylene (PTFE) filled acetal homopolymer resin. 2. APPLICATION This specification was released originally for material used for mini-vent window division bar brackets. 3. REQUIREMENTS 3.1 INFRARED SPECTROPHOTOMETRY AN
3、D/OR THERMAL ANALYSIS Ford Motor Company, at its option, may conduct infrared and/or thermal analysis of material/parts supplied to this specification. The IR spectra and thermograms established for initial approval shall constitute the reference standard and shall be kept on file at the designated
4、material laboratory. All samples shall produce IR spectra and thermograms that correspond to the reference standard when tested under the same conditions. 3.2 CONDITIONING AND TEST CONDITIONS All test values indicated herein are based on material conditioned in a controlled atmosphere of 23 + 2 C an
5、d 50 + 5% relative humidity for not less than 24 h prior to testing and tested under the same conditions unless otherwise specified. 3.3 MOLDING COMPOUND 3.3.1 Composition, by weight Acetal Homopolymer 84 - 86% PTFE 14 - 16% Ash, max 0.4% Test Method: Thermogravimetric Analysis (TGA). General para-m
6、eters, 40 + 5 mg sample, 5 to 10 C/min heating rate, nitrogen atmosphere at 96 - 103 kPa with flow rate of 50 + 2 cm3/min. 3.4 MOLDED TEST SPECIMEN 3.4.1 Specific Gravity 1.47 - 1.51 (ASTM D 792) ENGINEERING MATERIAL SPECIFICATION ESB-M4D169-A2 WP 3948-b Page 2 of 3 3.4.2 Tensile Strength, min 44.8
7、MPa (ASTM D 638) 3.4.3 Elongation, min 8% (ASTM D 638) 3.4.4 Flexural Strength, min 66 MPa (ASTM D 790, 6.4 x 12.7 mm specimen) 3.4.5 Flexural Modulus, min 2.1 GPa (ASTM D 790, 6.4 x 12.7 mm specimen) 3.4.6 Impact Strength, Izod, min (ASTM D 256, 6.4 x 12.7 mm specimen) Notched 27 J/m Unnotched 267
8、J/m 3.4.7 Heat Deflection Temperature, min (ASTM D 648, 6.4 x 12.7 mm specimen) At 0.45 MPa 160 C At 1.82 MPa 99 C 3.4.8 Hardness, Rockwell M, min 60 (ASTM D 875) 3.5 MOLDED PARTS 3.5.1 Appearance Shall be uniform in density, texture and finish, free of visible porosity, warpage, heat scorch, checks
9、, cracks, chipped edges and uneven surfaces. Shall also be free of other contamination. 3.5.2 Additional Requirements Specific requirements for physical properties of molded or extruded parts shall be specified on the engineering drawing and/or engineering part specification. All critical areas with
10、 respect to these properties shall be clearly designated on the engineering drawing. 3.6 SUPPLIERS RESPONSIBILITY All materials supplied to this specification must be equivalent in all characteristics to the material upon which approval was originally granted. ENGINEERING MATERIAL SPECIFICATION ESB-
11、M4D169-A2 WP 3948-b Page 3 of 3 Prior to making any change in the properties, composition, construction, color, processing or labeling of the material originally approved under this specification, whether or not such changes affect the materials ability to meet the specification requirements, the Su
12、pplier shall notify Purchasing, Toxicology and the affected Materials Engineering activity of the proposed changes and obtain the written approval of the Materials Engineering activity. Test data, test samples and a new code identification are to be submitted with the request. Substance restrictions
13、 imposed by law, regulations or Ford, apply to the materials addressed by this document. The restrictions are defined in Engineering Material Specification WSS-M99P9999-A1, unless a different suffix (e.g., A2 or A3) is specified on the engineering document for the application. 4. APPROVAL OF MATERIA
14、LS Materials defined by this specification must have prior approval by the responsible Materials Engineering activity. Suppliers desiring approval of their materials shall first obtain an expression of interest from the affected Purchasing, Design and Materials Engineering activity. Upon request, th
15、e Supplier shall submit to the affected Materials Engineering activity its own laboratory report to the specification (test results, not nominal values), the material designation and code number, and test specimens for Ford evaluation. Upon approval, the material will be added to the Engineering Mat
16、erial Approved Source List. 5. GENERAL INFORMATION This data is for information only and is not a requirement. 5.1 MOLD SHRINKAGE (ASTM D 955) 3.2 mm avg thickness 0.017 6.4 mm avg thickness 0.020 5.2 COMPRESSIVE PROPERTIES (ASTM D 695) 1% Deformation 13.8 MPa 10% Deformation 76 MPa 5.3 MELT RANGE 171 - 177 C
