1、 ENGINEERING MATERIAL SPECIFICATION Material Name Specification Number Date Action Revisions 2013 04 26 N Status Replaced by WSS-M4D979-B2/3 T. Nover, EU 2002 07 31 Activated L. Hess Controlled document at www.MATS Page 1 of 4 Copyright 2013 Ford Global Technologies, Inc. THERMOPLASTIC ELASTOMERIC M
2、OLDING COMPOUND, WSS-M4D979-A UNPAINTED AIRBAG COVER NOT TO BE USED FOR NEW DESIGN 1. SCOPE The material defined by this specification thermoplastic polyolefinic elastomer. 2. APPLICATION This specification was released originally to be used as an unpainted airbag cover. Parts produced from material
3、s of the specification must also meet the appropriate passenger and driver side airbag System Design Specification (SDS). 3. REQUIREMENTS Material specification requirements are to be used for initial qualification of materials. 3.1 STANDARD REQUIREMENTS FOR PRODUCTION MATERIALS Material suppliers a
4、nd part producers must conform to the Companys Standard Requirements For Production Materials (WSS-M99P1111-A). 3.2 MOLDED TEST SPECIMEN 3.2.1 Preparation of Test Specimens Unless otherwise specified all tests shall be carried out on injection molded one-end gated test specimens. The following dimen
5、sions 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 allowed. ENGINEERING MA
6、TERIAL SPECIFICATION WSS-M4D979-A Page 2 of 4 Copyright 2013 Ford Global Technologies, Inc. (s) 3.2.2 Density 0.91 - 0.93 g/cm3 (ISO 1183, Method A) (s) 3.2.3 Hardness, Durometer D 41-46 (ISO 868, 10 s dwell, +/- 5) (s) 3.2.4 Tensile Strength at Max Load, min 9.5 MPa (ISO R 527, 150 min x 10 x 4.0 +
7、/- 0.2 mm specimen, 50 mm/minute test speed) (s) 3.2.4.1 Elongation at Break, min 440 % (Test Method according to para 3.4.4) (s) 3.2.5 Flexural Modulus, min 220 MPa (ISO 178, 80 x 10 x 4.0 +/- 0.2 mm specimen, 2 mm/minute test speed, 64 mm support span) (s) 3.2.6 Heat Aging Performance (ISO 188, ex
8、cept 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) 3.2.6.1 Tensile Strength at +/- 25 % Change (Test Method per para 3.4.4) 3.2.6.2 Elongation at Break +/- 25 % (Test Method per para 3.4.4) 3.3 FOGGING (S
9、AE J1756, 3 h at 100 C heating, 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. ENGINEERING MATERIAL SPECIFICATION WSS-M4D979-A Page 3 of 4 Copyright 2013 Ford Global Technologies, Inc. 3.4 FLAMMABILITY
10、 (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 surface. 3.5 WEATHERING RESISTANCE After exposure in accordance with 3.7.1, 3.7.2 and 3.7.3, the material shall show no fading or color change in excess of the specif
11、ied AATCC rating (AATCC Evaluation Procedure 1). In addition, there shall be no cracking, crazing, or any other surface deterioration. Prior to testing, the colors shall be approved for color match by the Design Center Color Laboratory. Note: All initial approvals will be based on the preliminary we
12、atherometer exposure, pending Florida and Arizona exposure results for final approval 3.5.1 Xenon Arc Weatherometer, minimum Rating 4 - 5 (SAE J1885, 1240 kJ/m2 exposure, specimen size: 150 x 100 mm minimum, 3.2 +/- 0.2 mm thick, molded in smooth polished mold) 3.5.2 12 Months Florida Exposure, mini
13、mum Rating 4 - 5 (FLTM BI 160-01, 5 deg south, solid back under glass, specimen size: 150 x 100 mm, 3.2 +/- 0.2 mm thick, molded in smooth polished mold) 3.5.3 12 Months Arizona Exposure, minimum Rating 4 - 5 (FLTM BI 160-01, 5 deg south, solid back under glass, specimen size: 150 x 100 mm, 3.2 +/-
14、0.2 mm thick, molded in smooth polished mold) 3.6 RESISTANCE TO SCRATCHING, max (FLTM BN 108-13) 7N force using the 1 mm stylus Rating 1 2N force using the 7 mm mar balls Rating 1 ENGINEERING MATERIAL SPECIFICATION WSS-M4D979-A Page 4 of 4 Copyright 2013 Ford Global Technologies, Inc. 4. GENERAL INF
15、ORMATION The information given below is provided for clarification and assistance in meeting the requirements of this specification. 4.1 COEFFICIENT OF LINEAR THERMAL EXPANSION (ISO 11359-2(TMA), - 30 to 100 C) Parallel to Flow 7.6E-05 Across Flow 7.9E-05 4.2 MOLD SHRINKAGE (ISO 2577, approximately
16、150 x 100 x 3.2 +/- 0.2 mm injection molded specimen) 4.2.1 Molding Shrinkage . After 24 h at 23 +/- 2 C 08/1.1 4.2.2 Post Shrinkage (Separate specimens required for each test) . After 30 min. at 80 C 1.0/1.2 . After 60 minutes at 120 C 1.1/1.3 4.3 MULTI AXIAL IMPACT AT MAX LOAD, ave (ASTM D 3763, 1
17、00 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. 4.3.1 At 23 C 26 J 4.3.2 At - 40 C 25 J 4.4 RECYCLING CODE TEO
