1、 ENGINEERING MATERIAL SPECIFICATIONDate Action Revisions 2010 01 08 N-STATUS No replacement named J. Crist, NA 2005 09 14 Revised Inserted 3.0; Deleted 3.1, 3.2, 3.3, 3.7, 3.8 & 4 1988 11 30 Released SM/EQ9496 P. Kuntze Printed copies are uncontrolled Copyright 2010, Ford Global Technologies, LLC Pa
2、ge 1 of 4 POLYBUTHYLENE TEREPHTHALATE (PBT) WSK-M4D625-A 40% GLASS FIBER/MINERAL REINFORCED LOW WARPAGE MOLDING COMPOUND NOT TO BE USED FOR NEW DESIGN 1. SCOPE The material defined by this specification is a 40% glass fiber and mineral reinforced molding compound based on polybutylene terephthalate
3、(PBT) that has a low tendency to warpage. 2. APPLICATION This specification was released originally for material used for high frequency loudspeaker component and mounting device. 3. REQUIREMENTS Material specification requirements are to be used for initial qualification of materials. 3.0 STANDARD
4、REQUIREMENTS FOR PRODUCTION MATERIALS Material suppliers and part producers must conform to the Companys Standard Requirements For Production Materials (WSS-M99P1111-A). 3.4 MOLDING COMPOUND 3.4.1 Filler Content 38 - 42% (ISO 3451/2, at 750 +/- 50 C, test portion 2.5 - 3.0 g) 3.4.2 Melt Flow Rate 14
5、 - 24 g/10 minutes (ISO 1133/ASTM D 1238, 260 +/- 0.5 C, 2,16 kg) The material shall be dried for 4 h minimum at 130 - 135 C in a mechanical convection oven immediately preceding the test. 3.5 MOLDED TEST SPECIMEN 3.5.1 Preparation of Test Specimens Unless otherwise specified all tests shall be carr
6、ied 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 ENGINEERING MATERIAL SPECIFICATIONWSK-M4D625-A Printed copies are uncontrolled Copyright 2010, Ford Global Technologi
7、es, LLC Page 2 of 4 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 annealing allowed. 3.5.2 Density 1.58 - 1.64 g/cm (ISO 1183, Method A/ASTM D 792, Method A1) 3.5.3 Tensile Strength at
8、Max. Load, min 85 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 6.0 GPa (ISO 178/ASTM D 790M, Method I, Procedure A, 80 x 10 x 4.0 +/- 0.2 mm specimen, 64 mm support span) 3.5.5 Shear Modulus at 23 C 1.90 - 2.75 GPa (ASTM D 40
9、65, 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. Additionally, a Shear Modulus vs. Temperature curve shall be plotted for -50 to +220 C temperature range, at 5 C minimum intervals. The
10、plotted curve must be within tolerance range shown on page 6. 3.5.6 Impact Strength, Izod (ISO 180, Method A/ASTM D 256, Method A, 63.5 x 10 x 4.0 +/-0.2 mm specimen, 10 specimens for each test) 3.5.6.1 At 23 +/- 2 C, min 2.8 kJ/m 3.5.6.2 At -40 +/- 1 C, min 2.5 kJ/m The test specimens must be condi
11、tioned 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, but within 5 s. 3.5.7 Heat Deflection Temperature, min 180 C (ISO 75/ASTM D 648, 120 x 10 x 4.0 +/-0.2 mm spec
12、imen, at 1.82 MPa) 3.5.8 Heat Aging Performance (ISO 188/ASTM D 573, 1000 h at 140 +/- 2 C. Unaged property values shall 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% (
13、Test Method per para 3.5.6.1 at 23 C, specimens to be notched before heat ageing.) ENGINEERING MATERIAL SPECIFICATIONWSK-M4D625-A Printed copies are uncontrolled Copyright 2010, Ford Global Technologies, LLC Page 3 of 4 3.6 FLAMMABILITY (ISO 3795) Burn Rate, max, 100 mm/minute The specimen size requ
14、ired 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 specification. 5.1 COEFFICIENT OF LINEAR THERMAL EXPANSION 4.0-5/ C (ASTM D 696) 5.2 MOL
15、D 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 0.40 - 0.55% 5.2.2 Post Shrinkage (Separate specimens required for each test) After 48 h at 80 C 0.05% After 30 min at 120 C 0.05% 5.3 MELT TEMPERATURE 224 C (ISO 121
16、8, Method B/ASTM D 789) 5.4 MELT VOLUME RATE 10 - 17 cm/10 minutes (ISO 1133/ASTM D 1238, except 260 +/- 0.5 C, 2.16 kg load, extrudate volume in cm/10 minutes) The material shall be dried for 4 h minimum at 130 - 135 C in a mechanical convection oven immediately preceding the test. ENGINEERING MATERIAL SPECIFICATIONWSK-M4D625-A Printed copies are uncontrolled Copyright 2010, Ford Global Technologies, LLC Page 4 of 4
