1、 ENGINEERING MATERIAL SPECIFICATION Date Action Revisions 2013 04 26 N Status Replaced by WSS-M4D981-B1 T. Nover, EU 2006 07 21 Revised Inserted 3.0; Deleted 3.1, 3.2, 3.3, 3.7, 3.8 & 4 2001 11 27 Activated L. Hess L. Soreide Controlled document at www.MATS Copyright 2013, Ford Global Technologies,
2、LLC Page 1 of 3 THERMOPLASTIC ELASTOMERIC MOLDING COMPOUND, WSS-M4D981-A FOR PAINTED AIRBAG COVERS WSS-M4D981-A2 NOT TO BE USED FOR NEW DESIGN 1. SCOPE The material defined by these specifications is a thermoplastic polyolefinic elastomer. 2. APPLICATION These specifications were released originally
3、 to be used as a painted airbag cover. The first surface must be painted with a ultraviolet and heat resistant paint (WSS-M15J13-A). Parts produced from materials of the specification must also meet the appropriate passenger and driver side airbag System Design Specification (SDS). 3. REQUIREMENTS M
4、aterial specification requirements are to be used for initial qualification of materials. 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 t
5、his specification, identified by symbol (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 requi
6、red: 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. A A2 (s) 3.4.2 Density, g/cm3
7、 0.87 - 0.90 0.87-0.89 (ISO 1183, Method A) ENGINEERING MATERIAL SPECIFICATION WSS-M4D981-A/A2 Copyright 2013, Ford Global Technologies, LLC Page 2 of 3 A A2 (s) 3.4.3 Hardness, Durometer D 35 48 (ISO 868, 10 s dwell, +/- 5) (s) 3.4.4 Tensile Strength at Max Load, min, MPA 8.5 11 (ISO R 527, 150 min
8、 x 10 x 4.0 +/- 0.2 mm specimen, 50 mm/minute test speed) (s) 3.4.4.1 Elongation at Break, min, % 440 440 (Test Method according to para 3.4.4) (s) 3.4.5 Flexural Modulus, min, MPa 170 260 (ISO 178, 80 x 10 x 4.0 +/- 0.2 mm specimen, 2 mm/minute test speed, 64 mm support span) (s) 3.4.6 Heat Aging P
9、erformance (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 at Change, % +/- 25 +/- 25 (Test Method per para 3.4.4) 3.4.6.2 Elongation at Break,Change, % +/- 25 +/-
10、25 (Test Method per para 3.4.4) 3.5 FOGGING (SAE J1756, 3 h at 100 C heating, 21 C cooling plate, post test conditioning 1 h and 16 h) Fog Number, min 70 70 Formation of clear film, droplets or crystals is cause for rejection. 3.6 FLAMMABILITY (ISO 3795) Burn Rate, max, mm/min 100 100 The specimen s
11、ize required for material approval is 355 x 100 x 0.8 +/- 0.1 mm with a smooth surface. ENGINEERING MATERIAL SPECIFICATION WSS-M4D981-A/A2 Copyright 2013, Ford Global Technologies, LLC Page 3 of 3 5. GENERAL INFORMATION The information given below is provided for clarification and assistance in meet
12、ing the requirements of these specifications. 5.1 COEFFICIENT OF LINEAR THERMAL EXPANSION (ISO 11359-2(TMA), -30 to 100 C) A A2 Parallel to Flow 4.6-05 5.0-05 Across Flow 4.9-05 4.9-05 5.2 MOLD SHRINKAGE, % (ISO 2577, approximately 150 x 100 x 3.2 +/- 0.2 mm injection molded specimen) 5.2.1 Molding
13、Shrinkage . After 48 h at 23 +/- 2 C 0.5/0.6 0.6/1.0 5.2.2 Post Shrinkage (Separate specimens required for each test) . After 30 min. at 80 C 0.6/0.7 0.7/1.1 . After 60 minutes at 120 C 0.7/0.8 0.8/1.2 5.3 MULTI AXIAL IMPACT AT MAX LOAD, ave (ASTM D 3763, 100 x 100 x 2.5 +/- 0.2 mm edge gated inject
14、ion 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. 5.3.1 At 23 C 26 J 27 J 5.3.2 At -40 C 24 J 28 J 5.4 RECYCLING CODE TEO
