1、 ENGINEERING MATERIAL SPECIFICATIONDate Action Revisions 2010 01 14 N-STATUS No replacement named J. Crist, NA 2004 10 22 Revised Inactivated WSS-M4D975-A2, replaced by WSS-M4D975-A; inserted 3.0, 5.5 deleted 3.1, 3.2, 3.3, 3.7, 3.8 revised 3.4.2, 3.4.3, 3.4.4, 3.4.4.1, 3.4.5, 5.2.1, 5.2.2, 5.3 L. G
2、raham 2001 12 05 Activated L. Soreide Printed copies are uncontrolled Copyright 2010, Ford Global Technologies, LLC Page 1 of 4 THERMOPLASTIC ELASTOMERIC MOLDING COMPOUND AIRBAG WSS-M4D975-A COVER, 87 A DUROMETER HARDNESS, INTERIOR THERMOPLASTIC ELASTOMERIC MOLDING COMPOUND AIRBAG WSS-M4D975-A3 COVE
3、R, 40 D DUROMETER HARDNESS, INTERIOR NOT TO BE USED FOR NEW DESIGN 1. SCOPE The material defined by these specifications is a thermoplastic styrenic elastomer. 2. APPLICATION These specifications were released originally to be used as painted airbag cover. The airbag cover must be painted with a 2K
4、soft touch paint (WSS-M15J15-A1/A2). 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 symb
5、ol (s), shall be met with data representing 3 sigma values. 3.4 MOLDED TEST SPECIMEN 3.4.1 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. 50 min x 10 x 4.0 +/- 0.2 mm
6、Tensile Bar, ISO 3167) B. 20 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 allowed. ENGINEERING MATERIAL SPECIFICATIONWSS-M4D975-A & A3 Printed copies ar
7、e uncontrolled Copyright 2010, Ford Global Technologies, LLC Page 2 of 4 (s) 3.4.2 Specific Gravity, (ISO 1183, Method A) WSS-M4D975-A 0.95 1.01 WSS-M4D975-A3 0.97 - 1.01 (s) 3.4.3 Hardness (ISO 868, 10s dwell) Durometer A WSS-M4D975-A 82 - 92 Durometer D WSS-M4D975-A3 32 - 42 (s) 3.4.4 Tensile Stre
8、ngth at Break (ISO 37, Type 1, average with and against, 500 mm/minute test speed) WSS-M4D975-A 6.9 - 16.9 WSS-M4D975-A3 8.6 - 12.8 (s) 3.4.4.1 Elongation at Break, 500 - 723% (Test Method according to para 3.4.4) (s) 3.4.5 Flexural Modulus, (ISO 178, 80 x 10 x 4.0 +/- 0.2 mm specimen, 2 mm/minute t
9、est speed, 64 mm support span) WSS-M4D975-A 71 -149 MPa WSS-M4D975-A3 157 - 331 MPa (s) 3.4.6 Heat Aging Performance (ISO 188, except 120 +/- 50 air changes/h, 1000 h at 110 +/- 2 C. Unaged property values shall be determined at the time of the aged properties determination) 3.4.6.1 Tensile Strength
10、 at Change +/- 25% (Test Method per para 3.4.4) 3.4.6.2 Elongation at Break +/- 25% (Test Method per para 3.4.4) ENGINEERING MATERIAL SPECIFICATIONWSS-M4D975-A & A3 Printed copies are uncontrolled Copyright 2010, Ford Global Technologies, LLC Page 3 of 4 3.5 FOGGING (SAE J1756, 3 h at 100 C heating,
11、 21 C cooling plate, post test conditioning 1 h and 16 h) Fog Number, min 70 Formation of clear film, droplets or crystals is cause for rejection. 3.6 FLAMMABILITY (ISO 3795) Burn Rate, max 100 mm/minute The specimen size required for material approval is 355 x 100 x 0.8 +/- 0.1 mm with a smooth sur
12、face. 5. GENERAL INFORMATION The information given below is provided for clarification and assistance in meeting the requirements of these specifications. 5.1 COEFFICIENT OF LINEAR THERMAL EXPANSION (ISO 11359-2(TMA), -30 to 100 C) WSS-M4D975-A With Flow 175-6/C Across Flow 204-6/C WSS-M4D975-A3 Wit
13、h Flow 190-6/C Across Flow 161-6/C 5.2 MOLD SHRINKAGE (ISO 2577, approximately 150 x 100 x 3.2 +/- 0.2 mm injection molded specimen) 5.2.1 Molding Shrinkage . After 24 h at 23 +/- 2 C WSS-M4D975-A 1.0% WSS-M4D975-A3 1.3% ENGINEERING MATERIAL SPECIFICATIONWSS-M4D975-A & A3 Printed copies are uncontro
14、lled Copyright 2010, Ford Global Technologies, LLC Page 4 of 4 5.2.2 Post Shrinkage (Separate specimens required for each test) . After 48 h at 80 C WSS-M4D975-A 1.2% WSS-M4D975-A3 1.5% . After 60 minutes at 121 C WSS-M4D975-A 1.1% WSS-M4D975-A3 1.4% (s) 5.3 MULTI AXIAL IMPACT AT MAX LOAD, min (ASTM
15、 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 change by more that 10% during the impact event. Load energy and velocity are to be recorded as a function of displacement. At 23 C WSS-M4D
16、975-A 39.4 J WSS-M4D975-A3 25.1 J At -30 C WSS-M4D975-A 29.1 J WSS-M4D975-A3 29.3 J 5.4 RECYCLING CODE 5.5 MELT FLOW INDEX (ISO 1133, 230 C, 2.16 kg) WSS-M4D975-A 5 dg/min WSS-M4D975-A3 2 dg/min 5.6 TEAR STRENGTH (ISO 34, Method B procedure a/ASTM D 624, Die C, average with and against) WSS-M4D975-A 62 kN/m (Avg.) WSS-M4D975-A3 64 kN/m (Avg.)
