1、 ENGINEERING MATERIAL SPECIFICATIONDate Action Revisions 2010 06 11 N-STATUS No replacement named A. Pan, APA 2006 07 20 Revised Inserted 3.0; Deleted 3.1, 3.2, 3.3, 3.8, 3.9 & 4 1996 05 15 Activated M. Trapp Printed copies are uncontrolled Copyright 2010, Ford Global Technologies, LLC Page 1 of 5 P
2、OLYBUTYLENE TEREPHTHALATE (PBT), IMPACT WSS-M4D935-A1 MODIFIED MOLDING COMPOUND, SE NOT TO BE USED FOR NEW DESIGN 1. SCOPE The material defined by this specification is an unfilled impact modified, thermoplastic molding compound based on polybutylene terephthalate, with a UL 94 rating of V-O at 0.79
3、 mm thickness. 2. APPLICATION This specification was released originally for material used for power distribution box covers. 3. REQUIREMENTS 3.0 STANDARD REQUIREMENTS FOR PRODUCTION MATERIALS Material suppliers and part producers must conform to the Companys Standard Requirements For Production Mat
4、erials (WSS-M99P1111-A). 3.1.1 All requirements of this specification, identified by symbol (s), shall be met with data representing 3 sigma values. 3.4 MOLDING COMPOUND (s) 3.4.1 Melt Flow Rate 2.0 - 16.0 g/10 minutes (ISO 1133, 250 C, 5.00 kg) The material shall be dried for 1.5 h minimum at 150 C
5、 in a vacuum convection oven immediately preceding the test. (s) 3.4.2 Melt Temperature, min 222 C (ISO 3146, Method C, 10 C/min heating rate) 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-end gated test
6、 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 ISO 294. No an
7、nealing allowed. ENGINEERING MATERIAL SPECIFICATIONWSS-M4D935-A1Printed copies are uncontrolled Copyright 2010, Ford Global Technologies, LLC Page 2 of 5 3.5.2 Density 1.36 - 1.40 g/cm (ISO 1183, Method A) (s) 3.5.3 Tensile Strength at Max Load, min 28 MPa (ISO R 527, 150 minimum x 10 x 4.0 +/- 0.2
8、mm specimen, 5 mm/min) (s) 3.5.3.1 Elongation at Yield, min 2.5% (Test Method according to para 3.5.3) (s) 3.5.4 Flexural Modulus, min 1.4 GPa (ISO 178, 80 x 10 x 4.0 +/- 0.2 mm specimen, 2 mm/min test speed, 64 mm support span) 3.5.5 Shear Modulus at 23 C 660 - 1000 MPa (ASTM D 4065, forced constan
9、t 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. Soak time at each temperature interval - 3 minutes minimum) Additionally, a Shear Modulus versus Temperature cu
10、rve shall be plotted for -50 to +200 C temperature range, at 5 C minimum intervals. The plotted curve must be within tolerance range shown on page 5. (s) 3.5.6 Impact Strength, Izod, min (ISO 180/1A, 80 x 10 x 4.0 +/- 0.2 mm specimen, 10 specimens for each test) 3.5.6.1 At 23 +/- 2 C 33 kJ/m 3.5.6.2
11、 At -40 +/- 1 C 6 kJ/m 3.5.6.3 At -20 +/- 2 C kJ/mThe 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. (s) 3.5.7 Heat Deflection Temperature, min (ISO 75, 120 x 10 x 4.0 +/- 0.2 m
12、m specimen, edgewise, 0.32 +/- 0.01 mm deflection) 3.5.7.1 At 1.80 MPa 40 C 3.5.7.2 At 0.45 MPa 130 C All specimens dry as molded. If not tested immediately after molding, specimens must be stored in a sealed, moisture-proof container filled with silica gel. ENGINEERING MATERIAL SPECIFICATIONWSS-M4D
13、935-A1Printed copies are uncontrolled Copyright 2010, Ford Global Technologies, LLC Page 3 of 5 (s) 3.5.8 Heat Aging Performance (ISO 188, except 150 +/- 50 air changes/h, 1000 h at 140 +/- 2 C. After heat aging test specimens are to be conditioned in a desiccator for 3 - 5 h at 23 +/- 2 C. Unaged p
14、roperty values shall be determined at the time of the aged properties determination) 3.5.8.1 Tensile Strength at Max load percent Change +/- 25% (Test Method per para 3.5.3) 3.5.8.2 Impact Strength, Izod Change +/- 25% (Test Method per para 3.5.6.1, specimens to be notched before heat aging) 3.6 FOG
15、GING (FLTM BO 116-03, 3 h at 100 C heating, 21 C cooling plate) Fog Number, min 80 Formation of clear film, droplets or crystals is cause for rejection. 3.7 FLAMMABILITY (ISO 3795) Burn Rate, max 100 mm/minute Self extinguishing/No burn (SE/NBR) The specimen size required for material approval is 35
16、5 x 100 x 1.5 +/- 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 specification. 5.1 COEFFICIENT OF LINEAR THERMAL EXPANSION 8.9-5/ C (ASTM E 831 (TMA), temperature range -30 to +30 C) 5
17、.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 C 2.6% ENGINEERING MATERIAL SPECIFICATIONWSS-M4D935-A1Printed copies are uncontrolled Copyright 2010, Ford Global Technologies, LLC Page 4 of 5 5.2.2 Post Shrinkage (Separate specimens required for each test) . After 48 h at 80 C 0.12% . After 30 min at 120 C 0.24% 5.3 RECYCLING CODE PBT ENGINEERING MATERIAL SPECIFICATIONWSS-M4D935-A1Printed copies are uncontrolled Copyright 2010, Ford Global Technologies, LLC Page 5 of 5
