1、 ENGINEERING MATERIAL SPECIFICATIONDate Action Revisions 2010 01 21 N-STATUS No replacement named J. Crist, NA 2006 07 18 Revised Inserted 3.0; Deleted 3.1, 3.2, 3.3, 3.8, 3.9 & 4 1996 04 04 Activated M. Trapp Printed copies are uncontrolled Copyright 2010, Ford Global Technologies, LLC Page 1 of 5
2、STYRENE MALEIC ANHYDRIDE COPOLYMER (SMA), RUBBER MODIFIED, WSB-M4D925-A 42% LONG GLASS FIBER REINFORCED MOLDING COMPOUND NOT TO BE USED FOR NEW DESIGN 1. SCOPE The material defined by this specification is a rubber modified, 42% long glass fiber reinforced, styrene maleic anhydride copolymer thermop
3、lastic molding compound. The glass fibers are coated with a non-PVA (polyvinyl actate) binding agent which can withstand mold temperature of 315 C, without producing mold corroding by-products. 2. APPLICATION This specification was released originally for material used for the structural base of air
4、 bag module supports. 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, identified by symbol(s), shall be
5、 met with data representing 3 sigma values. 3.4 MOLDING COMPOUND (s) 3.4.1 Glass Fiber Content 40 - 44% (ISO 3451/1, Method A, at 650 +/- 25 C, test portion 2.5 to 3.0 g) 3.5 MOLDED TEST SPECIMEN 3.5.1 Preparation of Test Specimens Unless otherwise specified all tests shall be carried out on injecti
6、on 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 dimensions shall be cut from the center portion of the test specimen A and/or B. The specimens shall be prepared
7、 according to ISO 294. No annealing allowed. 3.5.2 Density 1.40 - 1.48 g/cm (ISO 1183, Method A) ENGINEERING MATERIAL SPECIFICATIONWSB-M4D925-APrinted copies are uncontrolled Copyright 2010, Ford Global Technologies, LLC Page 2 of 5 (s) 3.5.3 Tensile Strength at Max Load, min 112.4 MPa (ISO R 527, 1
8、50 minimum x 10 x 4.0 +/- 0.2 mm specimen, 5 mm/min test speed) (s) 3.5.4 Flexural Modulus, min 12.4 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 2.55 - 4.25 GPa (ASTM D 4065, forced constant amplitude, fixed frequency of 1 Hz
9、+/- 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 curve shall be plotted for -50 to +150
10、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 16.8 kJ/m 3.5.6.2 At -40 +/- 1 C 8.7 kJ/m The test s
11、pecimens 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 119 C (ISO 75, 120 x 10 x 4.0 +/- 0.2 mm specimen, edgewise 0.32 +/- 0.1 mm deflection. At 1.
12、80 MPa) 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. (s) 3.5.8 Vicat Softening Temperature, min 124 C (ISO 306, 10 x 10 x 4.0 +/- 0.2 mm specimens. Bath - silicone oil, temperature raise 5
13、0 +/- 5 C/h. Dial gage reset to 0 after addition of 5 kg weight. At 50 N load) 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 SPECIFICATIONWSB-M4D925-APrinted copies are
14、 uncontrolled Copyright 2010, Ford Global Technologies, LLC Page 3 of 5 3.5.9 Heat Aging Performance (ISO 188, except 150 +/- 50 air changes/h, 1000 h at 100 +/- 2 C. After heat aging test specimens are to be conditioned in a desiccator for 3 - 5 h at 23 +/- 2 C. Unaged property values shall be dete
15、rmined at the time of the aged properties determination) 3.5.9.1 Tensile Strength at Max Load +/- 15% Percent Change (Test Method per para 3.5.3) 3.5.9.2 Impact Strength, Izod Change +/- 15% (Test Method per para 3.5.6.1, specimens to be notched before heat aging) 3.6 FOGGING (FLTM BO 116-03, 3 h at
16、 100 C heating, 21 C cooling plate) Fog Number, min 90 Formation of clear film, droplets or crystals is cause for rejection. 3.7 FLAMMABILITY (ISO 3795) Burn Rate, max 100 mm/minute The specimen size required for material approval is 355 x 100 x 1.6 +/- 0.1 mm with a smooth surface. 5. GENERAL INFOR
17、MATION The information given below is provided for clarification and assistance in meeting the requirements of this specification. 5.1 COEFFICIENT OF LINEAR THERMAL EXPANSION 1.8-5/ 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 in
18、jection molded specimen) 5.2.1 Molding Shrinkage . After 48 h at 23 +/- 2 C 0.06% ENGINEERING MATERIAL SPECIFICATIONWSB-M4D925-APrinted 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 8
19、0 C 0.00% . After 30 min at 120 C 0.02% 5.2.3 Part Shrinkage . After 48 h at 23 +/- 2 C 0.16% 5.3 HEAT DEFLECTION TEMPERATURE, min 128 C (ISO 75, 120 x 10 x 4.0 +/- 0.2 mm specimen, edgewise 0.32 +/- 0.1 mm deflection. At 0.45 MPa) All specimens dry as molded. If not tested immediately after molding
20、, specimens must be stored in a sealed, moisture-proof container filled with silica gel. 5.4 MULTI AXIAL IMPACT AT MAX LOAD, min (ASTM D 3763, 100 x 100 x 2.5 +/- 0.2 mm edge gated injection molded specimens) Test velocity at initial contact with the test specimen shall be 6.7 m/s and must not chang
21、e by more than 10% during the impact event. Load energy and velocity are to be recorded as a function of displacement. 5.4.1 At 23 C 3.0 J 5.4.2 At -30 C 4.0 J 5.5 RECYCLING CODE SMAGF42 ENGINEERING MATERIAL SPECIFICATIONWSB-M4D925-APrinted copies are uncontrolled Copyright 2010, Ford Global Technologies, LLC Page 5 of 5
