1、 ENGINEERING MATERIAL SPECIFICATION Material Name Specification Number Date Release No. Released 2010 01 07 N-STATUS No replacement named J. Crist, NA 1984 05 03 CEN2-897050-C8 Revised 3.3.4 1982 07 28 Released CSM2-986913-C2 WP 3948-a Page 1 of 2 ACETAL, COPOLYMER, - 20% TETRAFLUOROETHYLENE ESA-M4D
2、420-A (TFE) FILLED ACETAL, HOMOPOLYMER - 20% TETRAFLUOROETHYLENE ESA-M4D420-B (TFE) FILLED NOT TO BE USED FOR NEW DESIGN 1. SCOPE The materials defined by these specifications are particulate tetrafluroethylene filled acetal resins. 2. APPLICATION These specifications were released originally for ma
3、terials used for shock absorber piston sleeves. 3. REQUIREMENTS 3.1 MOLDED TEST SPECIMENS 3.1.1 Specific Gravity 1.49 - 1.54 (ASTM D 792) 3.1.2 Composition, by weight Acetal 78 - 82% TFE 18 - 22 % Ash, max 0.5% Test Method: Thermogravimetric Analysis (TGA). General parameters: 40 +/- 5 mg sample, 5
4、to 10 C/min heating rate, nitrogen atmosphere at 96 - 103 kPa with flow rate of 50 +/- 2 cm3/min. 3.1.3 Tensile Strength, min 41.4 MPa (ASTM D 638) 3.1.4 Elongation, min 7% (ASTM D 638) 3.1.5 Flexural Modulus, min 2.1 GPa (ASTM D 790) 3.1.6 Impact Strength, Izod, min 27 J/m (ASTM D 256) ENGINEERING
5、MATERIAL SPECIFICATION ESA-M4D420-A/B WP 3948-b Page 2 of 2 3.1.7 Deflection Temperature, min (ASTM D 648, 1.82 MPa) ESA-M4D420-A 87 CC ESA-M4D420-B 102 C 3.1.8 Melt Point (ASTM D 2133) ESA-M4D420-A 158 - 165 C ESA-M4D420-B 171 - 182 C 3.2 INFRARED SPECTROPHOTOMETRY Ford Motor Company, at its option
6、, may conduct infrared analysis of material/parts supplied to this specification. The spectra established for initial approval shall constitute the reference standard and shall be kept on file at the designated material laboratory. All samples shall produce spectra that correspond to the reference s
7、tandard when tested under the same conditions as those specified on the master spectrum. 3.3 SUPPLIERS RESPONSIBILITY All materials supplied to this specification must be equivalent in all characteristics to the material upon which approval was originally granted. Prior to making any change in the p
8、roperties, composition, construction, color, processing or labelling of the material originally approved under this specification, whether or not such changes affect the materials ability to meet the specification requirements, the Supplier shall notify Purchasing, Toxicology and the affected Materi
9、als 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 imposed by law, regulations or Ford, apply to the materials addre
10、ssed 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 MATERIALS Materials defined by this specification must have prior approva
11、l 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, the 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 Material Approved Source List.
