1、 ENGINEERING MATERIAL SPECIFICATIONDate Action Revisions 2005 04 06 Activated M. A. Myers Printed copies are uncontrolled Copyright 2005, Ford Global Technologies, LLC Page 1 of 5 POLYAMIDE (PA) MXD6 55% GLASS FIBER AND MINERAL WSS-M4D992-A REINFORCED MOLDING COMPOUND 1. SCOPE The material defined b
2、y this specification is a glass fiber reinforced crystalline thermoplastic molding compound based on the polycondensation of metaxylylendiamine (MXDA) and adipic acid. 2. APPLICATION This specification was released originally for material used for painted exterior mirror shells that require high str
3、ength and good vibration characteristics. Notice: This material absorbs and retains moisture. Part design and tolerances must accommodate changes in part dimensions and physical properties due to moisture absorption or loss in the service/assembly environment. 3. REQUIREMENTS 3.1 STANDARD REQUIREMEN
4、TS 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, identified by symbol (s), shall be met with data representing 3 sigma values. 3.2 MOLDING COMP
5、OUND 3.2.1 Filler Content 52 58% (ISO 3451/4, test temperature 600 +/- 25 C, test portion 1 g) (s) 3.2.2 Melt Flow Rate 7.0 - 13.0 g/10 (ISO 1133, 275 C, 2.16 kg) minutes The material shall be dried for 12 hours minimum at 80 C in a mechanical convection oven immediately preceding the test. ENGINEER
6、ING MATERIAL SPECIFICATIONWSS-M4D992-A Printed copies are uncontrolled Copyright 2005, Ford Global Technologies, LLC Page 2 of 5 3.3 MOLDED TEST SPECIMEN 3.3.1 Preparation of Test Specimens Unless otherwise specified all tests shall be carried out on injection molded one-end gated test specimens. Th
7、e 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 annealing allowe
8、d. 3.3.2 Density 1.70 - 1.76 g/cm3(ISO 1183, Method A) (s) 3.3.3 Tensile Strength at Max Load, min 160 MPa (ISO R 527, 150 minimum x 10 x 4.0 +/- 0.2 mm specimen, 5 mm/min test speed) (s) 3.3.4 Flexural Modulus, min 16.0 GPa (ISO 178, 80 x 10 x 4.0 +/- 0.2 mm specimen, 2 mm/min test speed, 64 mm sup
9、port span) (s) 3.3.5 Impact Strength, Izod, min (ISO 180/1A, 80 x 10 x 4.0 +/- 0.2 mm specimen, 10 specimens for each test) 3.3.5.1 At 23 +/- 2 C 3.5 kJ/m23.3.5.2 At -40 +/- 1 C 3.2 kJ/m2The test specimens must be conditioned for minimum of 6 h at the above specified temperature prior to impact test
10、 Low temperature testing shall be done within the cold box. (s) 3.3.6 Heat Deflection Temperature, min 217 C (ISO 75, 120 x 10 x 4.0 +/- 0.2 mm specimen, edgewise, 0.32 +/- 0.01 mm deflection 1.80 MPa) All specimens dry as molded. If not tested immediately after molding, specimens must be stored in
11、 a sealed, moisture-proof container filled with silica gel. ENGINEERING MATERIAL SPECIFICATIONWSS-M4D992-A Printed copies are uncontrolled Copyright 2005, Ford Global Technologies, LLC Page 3 of 5 3.3.7 Heat Aging Performance (ISO 188, except 150 +/- 50 air changes/h, 1000 h at 140 +/- 2 C. Unaged p
12、roperty values shall be determined at the time of the aged properties determination) 3.3.7.1 Tensile Strength at Yield Change +/- 25% (Test Method per para 3.5.3) 3.3.7.2 Impact Strength, Izod Change +/- 25% (Test Method per para 3.5.6.1, specimens to be notched before heat aging) 3.4 FOGGING (SAE J
13、1756, 3 h at 100 C heating, 21 C cooling plate, post test conditioning 1 h and 16 h) Fog Number, min 90 Formation of clear film, droplets or crystals is cause for rejection. 3.5 FLAMMABILITY (ISO 3795) Burn Rate, max 100 mm/minute The specimen size required for material approval is 355 x 100 x 1.5 +
14、/- 0.1 mm with a smooth surface. 4. GENERAL INFORMATION The information given below is provided for clarification and assistance in meeting the requirements of this specification. 4.1 COEFFICIENT OF LINEAR THERMAL EXPANSION 1.3 7.0-5mm/C (ASTM E 831 (TMA), temperature range -30 to + 100 C) 4.2 MOLD
15、SHRINKAGE (ISO 2577, approx. 150 x 100 x 3.2 +/- 0.2 mm injection molded specimen) 4.2.1 Molding Shrinkage After 48 h at 23 +/- 2 C 0.3 0.7% 4.3 WATER ABSORPTION 0.3% (ISO 62, 24 h immersion, 50 +/- 1 mm diameter, 3.2 +/- 0.2 mm thick specimen) ENGINEERING MATERIAL SPECIFICATIONWSS-M4D992-A Printed
16、copies are uncontrolled Copyright 2005, Ford Global Technologies, LLC Page 4 of 5 4.4 MELT TEMPERATURE 243 C (ISO 3146, Method C) 4.5 IMPACT RESISTANCE, IZOD, min (ISO 180, Method A/ASTM D 256, Method A, 80 x 10 x 4.0 +/- 0.2 mm specimen, 10 specimens minimum) 4.5.1 After moisture conditioning 6.0 k
17、J/m2The notched specimens shall be immersed for 48 h in distilled water at 50 +/- 1 C and subsequently conditioned for 1 h at 23 +/- 2 C and 50 +/- 5% relative humidity prior to test and tested under the same conditions within 1 h. 4.6 RECYCLING CODE PAMXD6 (GF+MD) 55 4.7 SHEAR MODULUS at 23 C 4.2 7
18、0 GPa (ASTM D 4065, forced constant amplitude, fixed frequency of 1 Hz +/- 15%, strain level below 1%. Specimens approximately 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 min) Additionally a sh
19、ear modulus versus temperature curve shall be plotted for 50 to +220 C temperature range, at 5 C min intervals. The plotted curve must be within tolerance range granted on the original material approval and it shall constitute the reference standard for materials supplied to this specification and shall be kept on file at the designated material laboratory and be available on request. ENGINEERING MATERIAL SPECIFICATIONWSS-M4D992-A Printed copies are uncontrolled Copyright 2005, Ford Global Technologies, LLC Page 5 of 5
