1、 ENGINEERING MATERIAL SPECIFICATION Material Name Specification Number Date Action Changes 2010 01 12 N-STATUS No replacement named J. Crist, NA 1992-06-01 EP00E10176270000 Released P. Kuntze WP 3948-a Page 1 of 8 POLYBUTYLENE TEREPHTHALATE (PBT), MODIFIED 20 % WSK-M4D753-A GLASS FIBER REINFORCED MO
2、LDING COMPOUND, EXTERIOR NOT TO BE USED FOR NEW DESIGN 1. SCOPE The material defined by this specification is a 20 % glass fibre reinforced thermoplastic polyester molding compound based on polybutylene terephthalate (PBT) modified with polyethylene terephthalate (PET), UV stabilized for unpainted e
3、xterior applications. 2. APPLICATION This specification was released originally for material used for outside doorhandle. 3. REQUIREMENTS 3.1 STATISTICAL PROCESS Suppliers must conform to the requirements of Ford Quality System Standard Q-101. A mutually acceptable Control Plan as described therein
4、is required for material/source approval. Appropriate statistical tools must be used to analyze process/product data so that variation in the final product is continuously reduced. 3.2 INFRARED SPECTROPHOTOMETRY AND/OR THERMAL ANALYSIS Ford Motor Company, at its option, may conduct infrared and/or t
5、hermal 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 material laboratory. All samples shall produce IR spectra and thermograms that corresp
6、ond to the reference standard when tested under the same conditions. 3.3 CONDITIONING AND TEST CONDITIONS All test values indicated herein are based on material conditioned in a controlled atmosphere of 23 +/- 2 EC and 50 +/- 5 % relative humidity for not less than 24 h prior to testing and tested u
7、nder the same conditions unless otherwise specified. ENGINEERING MATERIAL SPECIFICATION WSK-M4D753-A WP 3948-b Page 2 of 8 3.4 MOLDING COMPOUND 3.4.1 Melt Flow Rate 15 - 24 g/ (ISO 1133/ASTM D 1238, 260 EC, 2.16 kg) 10 minutes The material shall be dried for 4 h minimum at 130 - 135 EC in a mechanic
8、al convection oven immediately preceding the test. 3.4.2 Glass Fiber Content 18 - 22 % (ISO 3451/2, test temperature 750 +/- 25 EC, test portion 2.5 - 3.0 g) 3.5 MOLDED TEST SPECIMEN 3.5.1 Preparation of Test Specimens Unless otherwise specified all tests shall be carried out on injection molded one
9、-end gated test specimens. The following dimensions are required: A. 150 min x 10 x 4.0 +/- 0.2 mm (Tensile Bar, ISO 3167) B. 120 x 10 x 4.0 +/- 0.2 mm Specimens with shorter dimensions shall be cut from the center portion of the test specimen A and/or B. The specimens shall be prepared according to
10、 ISO 294. No annealing allowed. 3.5.2 Density 1.44 - 1.50 g/cm3(ISO 1183, Method A/ASTM D 792, Method A1) 3.5.3 Tensile Strength at Max Load, min 108 MPa (ISO R 527/ASTM D 638M, 150 min x 10 x 4.0 +/- 0.2 mm specimen, 5 mm/minute test speed) 3.5.4 Flexural Modulus, min 5.0 GPa (ISO 178/ASTM D 790M,
11、Method I, Procedure A, 80 x 10 x 4.0 +/- 0.2 mm specimen, 2 mm/min test speed, 64 mm support span, the radius of the loading nose 5.0 +/- 0.1 mm and of the supports 2.0 +/- 0.2 mm) 3.5.5 Shear Modulus at 23 EC 1.3 - 1.9 GPa (ASTM D 4065, forced constant amplitude, fixed frequency of 1 Hz +/- 15 %, s
12、train level below 1 %. Specimen approx. 60 x 10 x 4.0 +/- 0.2 mm cut from the center of specimen A. Specimen length between clamps 35 - 40 mm soak time at each temperature interval: 3 minutes minimum) ENGINEERING MATERIAL SPECIFICATION WSK-M4D753-A WP 3948-b Page 3 of 8 Additionally, a Shear Modulus
13、 vs. Temperature curve shall be plotted for - 50 to + 220 EC temperature range, at 5 EC minimum intervals. The plotted curve must be within tolerance range shown on page 7. 3.5.6 Impact Strength, Izod, min (ISO 180, Method A/ASTM D 256, Method A, 80 x 10 x 4.0 +/- 0.2 mm specimen, 10 specimens for e
14、ach test) 3.5.6.1 At 23 +/- 2 EC 5.5 kJ/m23.5.6.2 At - 40 +/- 2 EC 5.5 kJ/m2The test specimens must be conditioned for minimum of 6 h at the above specified temperature prior to impact test. Low temperature testing shall be done within the cold box, if not possible, test can be conducted outside, bu
15、t within 5 s. 3.5.7 Heat Deflection Temperature, min 185 EC (ISO 75/ASTM D 648, 120 x 10 x 4.0 +/- 0.2 mm specimen, at standard deflection of 0.32 +/- 0.01 mm. At 1.82 MPa) 3.5.8 Heat Aging Performance (ISO 188/ASTM D 573, 150 +/- 50 air changes/h, 1000 h at 170 +/- 2 EC. Unaged property values shal
16、l be determined at the time of the aged properties determination) 3.5.8.1 Tensile Strength Change - 25 % (Test Method per para 3.5.3) 3.5.8.2 Impact Strength, Izod Change - 20 % (Test Method per para 3.5.6.1, specimens to be notched before heat aging) 3.6 FLAMMABILITY (ISO 3795) Burn Rate, max 100 m
17、m/minute The specimen size required for material approval is 355 x 100 x 1.0 +/- 0.1 mm with a smooth surface. ENGINEERING MATERIAL SPECIFICATION WSK-M4D753-A WP 3948-b Page 4 of 8 3.7 WEATHERING RESISTANCE After exposure in accordance with 3.8.1, 3.8.2 and 3.8.3, the material shall show no color ch
18、ange in excess of specified Gray Scale rating (AATCC Evaluation Procedure 1/ISO 105-A02). In addition, there shall be no cracking, crazing or other deterioration. A slight loss of gloss or chalking will be allowed provided an acceptable appearance can be achieved by polishing with Ford car polish (a
19、uto wax) at permission of the affected Product Development Materials Activity. All initial approvals will be based on the preliminary Weatherometer exposure, pending Florida exposure results for final approval. 3.7.1 Xenon Arc Weatherometer Rating 4 (SAE J1960, 1580 kJ/m2exposure minimum, specimen s
20、ize: 150 x 100 mm minimum, 3.2 +/- 0.2 mm thick, molded in smooth polished mold) 3.7.2 12 months Florida Rating 4 (FLTM BI 160-01, 5 south, direct weathering inland, specimen size: 150 x 100 mm, minimum, 3.2 +/- 0.2 mm thick, molded in smooth polished mold) 3.7.3 24 months Florida Rating tbd (FLTM B
21、I 160-01, 5 south, direct weathering inland, specimen size: 150 x 100 mm, minimum, 3.2 +/- 0.2 mm thick, molded in smooth polished mold) 3.8 ADDITIONAL REQUIREMENTS Specific requirements for material and/or manufactured parts shall be specified on the Engineering drawing, Engineering parts specifica
22、tion and/or performance specifications. All critical areas with respect to these properties shall be clearly designated on the Engineering drawing. 3.9 SUPPLIERS RESPONSIBILITY All materials supplied to this specification must be equivalent in all characteristics to the material upon which approval
23、was originally granted. 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 Supplier s
24、hall 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. ENGINEERING MATERIAL SPECIFICA
25、TION WSK-M4D753-A WP 3948-b Page 5 of 8 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, unless a different suffix (e.g., A2 or A3) is specified on the en
26、gineering document for the application. 4. APPROVAL OF MATERIALS 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 Purchasin
27、g, Design and Materials Engineering activity. Upon request, the Supplier shall submit to the affected Materials Engineering activity a completed copy of their laboratory test reports, signed by a qualified and authorized representative of the test facility, demonstrating full compliance with all the
28、 requirements of this specification (test results, not nominal values), the material designation and code number, and test specimens for Ford evaluation. Fords engineering approval of a material will be based on its performance to this specification and on an assessment of suitability for intended p
29、rocesses and/or applications. Upon approval, the material will be added to the Engineering Material Approved Source List. 5. GENERAL INFORMATION The information below is provided for clarification and assistance in meeting the requirements to the specification. 5.1 COEFFICIENT OF LINEAR THERMAL EXPA
30、NSION 2.5 - 4E-5/ C (ASTM D 696) 5.2 MOLD SHRINKAGE (ISO 2577, approx. 150 x 100 x 3.2 +/- 0.2 mm injection molded specimen) 5.2.1 Molding Shrinkage . After 48 h at 23 +/- 2 EC In Flow Direction 0.25 - 0.50 % Transverse to Flow Direction 1.30 - 1.60 % 5.2.2 Post Shrinkage (Separate specimens require
31、d for each test) . After 48 h at 80 EC 0.05 % . After 30 min at 120 EC 0.1 % ENGINEERING MATERIAL SPECIFICATION WSK-M4D753-A WP 3948-b Page 6 of 8 5.3 MELT VOLUME RATE 12-20 cm3/10 min (ISO 1133/ASTM D 1238, 260 EC, 2.16 kg) The material shall be dried for min of 4 h at 130 - 135 EC in a mechanical
32、convection oven immediately preceding the test. 5.4 HEAT DEFLECTION TEMPERATURE, min 210 EC (ISO 75/ASTM D 648, 120 x 10 x 4.0 +/- 0.2 mm specimen. At 0.45 MPa) 5.5 MELT TEMPERATURE 220 - 226 EC (ISO 1218, Method B/ASTM D 789) ENGINEERING MATERIAL SPECIFICATION WSK-M4D753-A WP 3948-b Page 7 of 8 5.6 RECYCLING CODE SAE or PBT-GF20 OPTIONAL PBTGF20ENGINEERING MATERIAL SPECIFICATION WSK-M4D753-A WP 3948-b Page 8 of 8
