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 1996 01 12 Activated M. Trapp Controlled document at www.MATS Copyright 2012, Ford Global Technologies, LLC Page 1 of 4 P
2、OLYBUTYLENE TEREPHTHALATE (PBT) MOLDING COMPOUND WSS-M4D929-A2 NOT TO BE USED FOR NEW DESIGN 1. SCOPE The material defined by this specification is a thermoplastic unfilled high temperature molding compound based on polybutylene terephthalate (PBT). 2. APPLICATION This specification was released ori
3、ginally for material used for electrical connectors. 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). 3.1.1 All requirements of this specification, id
4、entified by symbol(s), shall be met with data representing 3 sigma values. 3.4 MOLDING COMPOUND (s) 3.4.1 Melt Flow Rate 6.0 - 14.4 g/10 minutes (ISO 1193, 250 C, 2.16 kg) The material shall be dried for 4 h minimum at 125 +/- 2 C in a mechanical convection oven immediately preceding the test. 3.5 M
5、OLDED 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 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 w
6、ith 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 annealing allowed. 3.5.2 Density 1.31 - 1.36 g/cm (ISO 1183, Method A) (s) 3.5.3 Tensile Strength at Yield, min 46 MPa (ISO 527-1 & ISO 527-2, 150 min
7、imum x 10 x 4.0 +/- 0.2 mm specimen, 50 mm/min test speed) ENGINEERING MATERIAL SPECIFICATION WSS-M4D929-A2 Copyright 2012, Ford Global Technologies, LLC Page 2 of 4 (s) 3.5.3.1 Elongation at Break, min 20% (Test Method according to paragraph 3.5.3) (s) 3.5.4 Flexural Modulus, min 1.6 GPa (ISO 178,
8、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 560 - 840 MPa (ASTM D 5279, 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
9、 length between clamps 35 - 40 mm. Soak time at each temperature interval - 3 minutes minimum) Additionally, a Shear Modulus vs. Temperature curve shall be plotted for -50 to +180 C temperature range, at 5 C minimum intervals. The plotted curve must be within tolerance range shown on page 4. (s) 3.5
10、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 27.7 kJ/m 3.5.6.2 At -40 +/- 2 C 14.9 kJ/m The test specimen must be conditioned for minimum of 6 hours at the above specified temperature prior to impact test. Low tempera
11、ture testing shall be done within the cold chamber, if not possible, test may be conducted outside, but within 5 seconds. (s) 3.5.7 Heat Deflection Temperature, min 76 C (ISO 75-1 & ISO 75-2, 80 x 10 x 4.0 +/- 0.2 mm specimen, edgewise, 0.32 +/- 0.01 mm deflection. At 1.80 MPa.) 3.5.8 Heat Aging Per
12、formance (ISO 188, except 150 +/- 50 air changes/h, 1000 h at 110 +/- 2 C. Unaged property values shall be determined at the time of the aged properties determination) 3.5.8.1 Tensile Strength at Max Load +/- 25% Change (Test Method per para 3.5.3) 3.5.8.2 Impact Strength, Izod Change +/- 50% (Test
13、Method per para 3.5.6.1, specimens to be notched before heat aging) ENGINEERING MATERIAL SPECIFICATION WSS-M4D929-A2 Copyright 2012, Ford Global Technologies, LLC Page 3 of 4 3.6 FLAMMABILITY (ISO 3795/SAE J369) Burn Rate, max 100 mm/minute The specimen size required for material approval is 355 x 1
14、00 x 1.6 +/- 0.1 mm with a smooth surface. 3.7 FOGGING (SAE J1756, 3 h at 100 C heating, 21 C cooling plate, post test conditioning 1 h) Fog Number, min 90 Formation of clear film, droplets or crystals is cause for rejection. 5. GENERAL INFORMATION The information given below is provided for clarifi
15、cation and assistance in meeting the requirements of this specification. 5.1 COEFFICIENT OF LINEAR THERMAL EXPANSION 4.7 - 9.4-5/C (ASTM E 831 TMA, temperature range -40 to +140 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 . A
16、fter 48 h at 23 +/- 2 C 1.49% 5.2.2 Post Shrinkage (Separate specimens required for each test) . After 48 h at 80 C 1.58% . After 30 minutes at 120 C 1.78% 5.3 MELT VOLUME RATE 8.5 cm/10 minutes (ISO 113, 250 C, 2.16 kg, extrudate volume in cm/10 minutes) 5.4 HEAT DEFLECTION TEMPERATURE 130 C (ISO 7
17、5-1 & ISO 75-2, 80 x 10 x 4.0 +/- 0.2 mm specimen, edgewise, 0.32 +/- 0.01 mm deflection. At 0.45 MPa) 5.5 MELT TEMPERATURE, min 185.6 C (ISO 1218, Method B/DSC - ASTM E 794) 5.6 MATERIAL IDENTIFICATION FOR RECYCLING PURPOSES PBT ENGINEERING MATERIAL SPECIFICATION WSS-M4D929-A2 Copyright 2012, Ford Global Technologies, LLC Page 4 of 4
