1、 ENGINEERING MATERIAL SPECIFICATION Material Name Specification Number WP 3948-a Page 2 of 4 POLYBUTYLENE TEREPHTHALATE, 30% GLASS FILLED - ESB-M4D354-A2 INTERNALLY LUBRICATED NOT TO BE USED FOR NEW DESIGN 1. SCOPE The material defined by this specification is a glass fiber reinforced polybutylene t
2、erephthalate resin with high heat resistance, good dimensional stability, high flexural properties, and good electrical resistance and is similar to the A1 grade, however, it is internally lubricated and nonpaintable. 2. APPLICATION This specification was released originally for material used for wi
3、ring connectors that are required to maintain a waterproof seal. 3. REQUIREMENTS 3.1 VIRGIN MOLDING COMPOUND 3.1.1 Flow Rate, max 6 g/10 min (ASTM D 1238, Condition “T“) 3.1.2 Glass Fiber Content, by weight 28 - 32% (1 h at 649 C) 3.2 MOLDED TEST SPECIMEN 3.2.1 Specific Gravity, max 1.58 3.2.2 Tensi
4、le Strength, min 103 MPa (ASTM D 638) Elongation, min 3.0% 3.2.3 Flexural Strength, min 159 MPa (ASTM D 790) 3.2.4 Flexural Modulus, min 6.2 GPa (ASTM D 790) 3.2.5 Flexural Elongation at Break, min 3% (ASTM D 790, Maximum Strain, Method I, 3.2 x 12.7 x 127 mm specimen, 5 mm/min test speed) Date Rele
5、ase No. Released 04/27/10 TO BE N-STATUS Replaced by WSK-M4D725-A A. Pan, APA 1984 05 25 Revised, Retyped CA01-RD-524768 1978 12 07 Released AJ1-6000-153 ENGINEERING MATERIAL SPECIFICATION Material Name Specification Number WP 3948-a Page 2 of 4 3.2.6 Impact Strength, Izod, min (ASTM D 256) 3.2.6.1
6、Notched 101 J/m 3.2.6.2 Unnotched 747 J/m 3.2.7 Deflection Temperature, min (ASTM D 648) At 0.45 MPa 199 C At 1.82 MPa 193 C 3.2.8 Water Absorption, max 0.10% (ASTM D 570, 24 h immersion) 3.2.9 Dielectric Strength, min 19 kV/mm (ASTM D 149, short time) 3.2.10 Flammability, max 100 mm/min (FLTM BN 24
7、-2, without the lot sampling plan) In addition, the test specimen shall not exhibit any flashing or sudden flaming on either surface in excess of the above maximum value. 3.3 MOLDED PART 3.3.1 Color Natural, or as specified on the engineering drawing. 3.3.2 Specific Gravity, max (ASTM D 792) 1.58 3.
8、3.3 Glass Fiber Content, by weight 28 - 32% (1 h at 649oC) 3.3.4 Physical Properties Specific requirements for physical properties of molded parts, when required, shall be specified on the engineering drawing. All critical areas with respect to these properties shall be clearly designated on the eng
9、ineering drawing. ENGINEERING MATERIAL SPECIFICATION ESB-M4D354-A2 WP 3948-b Page 3 of 4 3.3.5 Molding Quality The molded part shall be free of porosity and voids. 3.3.6 Heat Resistance No visual evidence of shrinkage or distortion, including gate areas, shall be evident on the molded part. The part
10、 shall not warp to the extent that fit with mating parts in ultimate assembly is affected. Test Method: Condition unassembled parts in a mechanical convection oven for 3 h at 143 C (unless otherwise specified on the engineering drawing). 3.3.7 Flow Rate, max Two times the actual value obtained (ASTM
11、 D 1238, for virgin material from the same Condition “T“) batch from which the part was molded 3.4 INFRARED SPECTROPHOTOMETRY AND/OR THERMAL ANALYSIS Ford Motor Company, at its option, may conduct infrared and/or thermal analysis of material/parts supplied to this specification. The curves establish
12、ed for initial approval shall constitute the reference standard and shall be kept on file at the designated material laboratory. All samples shall produce curves that correspond to the reference standard when tested under the same conditions as those specified on the master curve. 3.5 SUPPLIERS RESP
13、ONSIBILITY 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 properties, composition, construction, color, processing or labelling of the material originally approved un
14、der 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 Materials Engineering activity of the proposed changes and obtain the written approval of the Materials Engineeri
15、ng 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 addressed by this document. The restrictions are defined in Engineering Material Specification WSS-M99P9999-A1,
16、unless a different suffix (e.g., A2 or A3) is specified on the engineering document for the application. ENGINEERING MATERIAL SPECIFICATION ESB-M4D354-A2 WP 3948-b Page 4 of 4 4. APPROVAL OF MATERIALS Materials defined by this specification must have prior approval by the responsible Materials Engin
17、eering 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 th
18、e 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. 5. GENERAL INFORMATION This data is for information only and is not a requirement. 5.1 MOLD SHRINKAGE 0.002 - 0.007 (ASTM D 955) 5.2 COEFFICIENT OF LINEAR THERMAL EXPANSION 6.3 x 10-5/C (ASTM D 696) 5.3 COMPRESSIVE STRENGTH 110 MPa (ASTM D 695)
