1、 ENGINEERING MATERIAL SPECIFICATION Date Action Revisions Rev. 3 2012 07 23 Revised Replaced by WSS-M4D359-C1 A. Pan, APA 2010 06 11 N-STATUS Replaced by WSK-M4D639-A A. Pan, APA 1994 11 04 Released NB00I10043054378 M. Trapp Controlled document at www.MATS Copyright 2012, Ford Global Technologies, L
2、LC Page 1 of 4 POLYBUTYLENE TEREPHTHALATE (PBT) MOLDING COMPOUND WSB-M4D636-A2 NOT TO BE USED FOR NEW DESIGN 1. SCOPE The material defined by this specification is a high temperature, thermoplastic molding compound based on polybutylene terephthalate (PBT). 2. APPLICATION This specification was rele
3、ased originally for material used for electrical power distribution boxes. 3. REQUIREMENTS 3.0 STANDARD REQUIREMENTS FOR PRODUCTION MATERIALS Material suppliers and part producers must conform to the Companys Standard Requirements For Production Materials (WSS-M99P1111-A). 3.4 MOLDED TEST SPECIMEN 3
4、.4.1 Preparation of Test Specimens Unless otherwise specified all tests shall be carried out on injection molded one-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 dimension
5、s shall be cut from the center portion of the test specimen A and/or B. The specimens shall be prepared according to ISO 294. No annealing allowed. 3.4.2 Density 1.28 - 1.34 g/cm3(ISO 1183, Method A) (s) 3.4.3 Tensile Strength at Yield, min 48 MPa (ISO R 527, 150 minimum x 10 x 4.0 +/- 0.2 mm specim
6、en, 50 mm/minute test speed (s) 3.4.3.1 Elongation at Break, min 5.0% (Test Method according to para 3.4.3) ENGINEERING MATERIAL SPECIFICATION WSB-M4D636-A2 Copyright 2012, Ford Global Technologies, LLC Page 2 of 4 (s) 3.4.4 Flexural Modulus, min 1.8 GPa (ISO 178, 80 x 10 x 4.0 +/- 0.2 mm specimen,
7、2 mm/min test speed, 64 mm support span) 3.4.5 Shear Modulus at 23 C 700 - 1060 MPa (ASTM D 4065, forced constant amplitude, fixed frequency of 1 Hz +/- 15%, strain 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. S
8、oak time at each temperature interval - 3 minutes minimum) Additionally, a Shear Modulus versus Temperature curve shall be plotted for -50 to +220 C temperature range, at 5 C minimum intervals. The plotted curve must be within tolerance range shown on page 4. (s) 3.4.6 Impact Strength, Izod, min (IS
9、O 180/1A, 80 x 10 x 4.0 +/- 0.2 mm specimen, 10 specimens for each test) 3.4.6.1 At 23 +/- 2 C 2.8 kJ/m23.4.6.2 At -40 +/- 1 C 1.9 kJ/m23.4.6.3 At -20 +/- 2 C 2.1 kJ/m2The test specimens must be conditioned for minimum of 6 h at the above specified temperature prior to impact test. Low temperature t
10、esting shall be done within the cold box. (s) 3.4.7 Heat Deflection Temperature, min (ISO 75, 120 x 10 x 4.0 +/- 0.2 mm specimen, edgewise, 0.32 +/- 0.01 mm deflection) 3.4.7.1 At 1.80 MPa 46 C 3.4.7.2 At 0.45 MPa 148 C 3.4.8 Heat Aging Performance (ISO 188, except 150 +/- 50 air changes/h, 1000 h a
11、t 120 +/- 2 C. Unaged property values shall be determined at the time of the aged properties determination) 3.4.8.1 Tensile Strength at Yield Change +/- 25% (Test Method per para 3.4.3) 3.4.8.2 Impact Strength, Izod Change +/- 25% (Test Method per para 3.4.6.1, specimens to be notched before heat ag
12、ing) ENGINEERING MATERIAL SPECIFICATION WSB-M4D636-A2 Copyright 2012, Ford Global Technologies, LLC Page 3 of 4 3.5 FOGGING (SAE J1756, 3 h at 100 C heating, 21 C cooling plate, post test conditioning 1 h) Fog Number, min 80 Formation of clear film, droplets or crystals is cause for rejection. 3.6 F
13、LAMMABILITY (ISO 3795/SAE J369) Burn Rate, max 100 mm/minute The specimen size required for material approval is 355 x 100 x 1.0 +/- 0.1 mm with a smooth surface. 5. GENERAL INFORMATION The information given below is provided for clarification and assistance in meeting the requirements of this speci
14、fication. Contact for questions concerning Engineering Material Specifications. 5.1 COEFFICIENT OF LINEAR THERMAL EXPANSION 11.6-5/ C (ASTM E 831 TMA, temperature range -30 to +30 C) 5.2 MOLD SHRINKAGE (ISO 2577, approx. 150 x 100 x 3.2 +/- 0.2 mm injection molded specimen) 5.2.1 Molding Shrinkage
15、. After 48 h at 23 +/- 2 C 1.8 - 2.0% 5.2.2 Post Shrinkage (Separate specimens required for each test) . After 48 h at 80 C 0.1 - 0.4% . After 30 min at 120 C 0.1 - 0.4% 5.3 MELT TEMPERATURE, min 215 C (ISO 3146, Method C, 10 C/min heating rate) 5.4 MELT FLOW RATE 3 - 8 g/10 minutes (ISO 1133, except 250 C, 325 g, 5 min dwell) The material shall be dried for 3 h minimum at 130 +/- 2 C in a mechanical convection oven immediately preceding the test. 5.5 RECYCLING CODE PBT ENGINEERING MATERIAL SPECIFICATION WSB-M4D636-A2 Copyright 2012, Ford Global Technologies, LLC Page 4 of 4
