1、 ENGINEERING MATERIAL SPECIFICATION Date Action Revisions Rev. 0 2013 03 14 Released T.Nover, M.Corley, V. Cerato; FoE Controlled document at www.MATS Copyright 2013, Ford Global Technologies, LLC Page 1 of 7 THERMOPLASTIC ELASTOMERIC MOLDING COMPOUND WSS-M4D979-B2 UNPAINTED STEERING WHEEL/SIDE AIRB
2、AG COVER THERMOPLASTIC ELASTOMERIC MOLDING COMPOUND WSS-M4D979-B3 UNPAINTED KNEE AIRBAG COVER 1. SCOPE The material defined by this specification is a thermoplastic polyolefinic elastomer. 2. APPLICATION WSS-M4D979-B2 This specification was released originally for unpainted airbag covers with high s
3、un exposure such as steering wheel/side airbag covers. Parts produced from materials of the specification must also meet the appropriate airbag System Design Specification (SDS) WSS-M4D979-B3 This specification was released originally to be used for airbag covers with low sun exposure such as knee a
4、irbag covers. Parts produced from materials of the specification must also meet the appropriate airbag System Design Specification (SDS) LIMITATIONS These materials should not be used for painted applications. 3. REQUIREMENTS 3.1 STANDARD REQUIREMENTS FOR PRODUCTION MATERIALS Material suppliers and
5、part producers must conform to the Companys Standard Requirements for Production Materials (WSS-M99P1111-A). Many 4D resin specifications prior to 2011, identified certain requirements with the symbol (s), which indicated that the mean and +/- 3 sigma values were to be reported. The specification mi
6、nimum, maximum or range was established using 3 sigma data. For 2011 and beyond, refer to Table 1 for number of samples required for each test to establish specification limits. 3.1.1 Materials used in interior applications must meet the requirements outlined in WSS-M99P2222-D1/Latest, Performance,
7、Vehicle Interior Environment Quality Material/Component Requirements. Data must be included in material submission package. ENGINEERING MATERIAL SPECIFICATION WSS-M4D979-B2/B3 Copyright 2013, Ford Global Technologies, LLC Page 2 of 7 3.1.2 Performance Criteria: Parts using this specification shall m
8、eet the appropriate performance specification,WSS-M15P4-F/ Latest. 3.2 SAMPLE PREPARATION Unless otherwise specified all tests shall be carried out on injection molded, one-end gated test specimens. The test specimens A and D shall be molded using molding conditions defined in ISO 1873-2. No anneali
9、ng is allowed. See Tables 1 and 2 for the number of samples required. Specimens shall be as follows: Specimen A 150 minimum x 10 x 4.0 +/- 0.2 mm (ISO 527-2, Specimen Type 1A) Specimen B 355 x 100 x 1.0 +/- 0.1 mm (ISO 3795) Specimen C 145 x 60 x 3.2 +/- 0.2 mm Specimen D Center of Specimen A, 80 x
10、10 x 4.0 +/- 0.2 mm Specimen E 100 mm diameter x 3.2 mm Specimen F 80 mm diameter x 3.2 mm Specimen G 90 mm x 200 mm Specimen H 50 +/- 1 mm diameter x 3.2 +/- 0.2 mm Specimen I 100 mm x 150 mm, min 3.3 APPEARANCE 3.3.1 Weathering Resistance (Interior, unpainted) Rating 4 min (FLTM BO 116-01, exposur
11、e in kJ/m2 B2 B3 Specimen C from smooth polished mold, 2406.4 451.1 ISO 105-A02 / AATCC Evaluation Procedure 1) For B2: Every 526.4 kJ/m2 remove the samples from the weatherometer and allow them to cool for one hour. Conduct a tactile evaluation and report any tackiness. Visually evaluate and report
12、 any spewing or other exudation. After exposure the material shall show no fading or color change in excess of the specified AATCC rating. In addition, there shall be no cracking, crazing or other deterioration. Use regional choice for initial approval and report the color house used. See Table 2 fo
13、r additional color durability submission requirements. 3.3.2 Resistance to Scratch and Mar (FLTM BO 162-01, Specimen I) Scratch Rating 2 at 2N, max Whitening/Color Change Rating 1 at 7N, max Marring Rating 2 at 2N, max These values are derived from colored and grained samples in agreement with Mater
14、ials Engineering. Details regarding color house, let down ratio, colors, grain, etc can be found in the approval package. ENGINEERING MATERIAL SPECIFICATION WSS-M4D979-B2/B3 Copyright 2013, Ford Global Technologies, LLC Page 3 of 7 3.4 MATERIAL PROPERTIES 3.4.1 Density 0.87 0.93 g/cm3 (ISO 1183, Met
15、hod A) 3.4.2 Hardness, Durometer D 40 - 54 (ISO 868, 15 s dwell) 3.4.3 Tensile Strength at Break 7 - 20 MPa (ISO 527-1 and ISO 527-2, Specimen A, 50 mm/minute test speed) 3.4.4 Elongation at Break 300 % min (ISO 527-1 and ISO 527-2, Specimen A, 50 mm/minute test speed) 3.4.5 Flexural Modulus 220 MPa
16、 min (ISO 178, Specimen D, 64 mm support span, 2 mm/minute test speed) 3.4.6 Heat Aging Performance (ISO 188, 150 +/- 50 air changes/h, 1000 h at WSS-M4D979-B1/B2: 110+/- 2 C. WSS-M4D979-B3: 100+/- 2 C. After heat aging test specimens are to be conditioned in a desiccator for 3 - 5 h at 23 +/- 2 C.
17、Unaged property values shall be determined at the time of the aged properties determination) 3.4.6.1 Tensile Strength at break, Change +/- 25% max (Test Method per para 3.4.3) 3.4.6.2 Elongation at break +/- 25% max (Test Method per para 3.4.4) 3.4.7 Odor Rating 3 max (FLTM BO 131-03, Variant C, Spe
18、cimen G) 3.4.8 Fogging Photometric (SAE J1756, Specimen F, 3 h at 100 C heating, 21 C cooling plate, post test conditioning 16 h) Fog Number 70 min Formation of clear film, droplets or crystals is cause for rejection. 3.4.9 Flammability (ISO 3795/SAE J369, Specimen B, smooth surface) Burn Rate 100 m
19、m/minute max ENGINEERING MATERIAL SPECIFICATION WSS-M4D979-B2/B3 Copyright 2013, Ford Global Technologies, LLC Page 4 of 7 3.5 MATERIAL PROPERTIES REPORT ONLY Values are retained in Ford Materials Database . 3.5.1 Melt Flow Rate Report Value (ISO 1133 230 C, 2,16 kg) g/10 minutes 3.5.2 Molding Shrin
20、kage (Report method used, sample size and value) After 48 h at 23 +/- 2 C Flow Report Value, % Cross Flow Report Value, % 3.5.3 Coefficient of Linear Thermal Expansion (ISO 11359-2, -30 +/- 2 C to Tg, Tg to 120 +/- 2 C) Flow Report Value, E-5 mm/mm/ C Cross Flow Report Value, E-5 mm/mm/ C 3.5.4 Impa
21、ct Strength Multiaxial (ASTM D 3763, Impact velocity: 6.6 m/s Specimen E, smooth surface injection molded specimen) Max Load Energy at 23 +/- 2 C Report J Energy Absorbed 100 % Ductile Failure Max Load Energy at -40 +/- 2 C Report J Energy Absorbed 100 % Ductile Failure Report test data for 23 +/- 2
22、 C, and continue until a minimum of 80% ductile are observed. A ductile failure is defined as a crack that does not radiate more than 10 mm from the center of the impact point. Test specimens must be conditioned for minimum of 6 h at test temperature prior to impact testing. Low temperature testing
23、shall be conducted within the same environmental chamber as the clamp mechanism of the impact device. Specimens can be transported from the conditioning environment to the testing environment, provided the transfer is within 5 seconds. 3.5.5 Poissons Ratio Report Ratio (ISO 527-1 and ISO 527-2, Spec
24、imen A, 1 mm/minute test speed) 3.5.6 Supplemental Information The following curves are to be submitted with the data packages: FTIR TGA DSC CLTE Engineering Stress/Strain at 23 C ENGINEERING MATERIAL SPECIFICATION WSS-M4D979-B2/B3 Copyright 2013, Ford Global Technologies, LLC Page 5 of 7 4. GENERAL
25、 INFORMATION The information given below is provided for clarification and assistance in meeting the requirements of this specification. Contact for questions concerning Engineering Material Specifications. 4.1 TYPICAL PROPERTIES USING METHODS IN SECTION 3.5 Para. Test Typical Value Units 3.5.1 Mel
26、t Flow Rate g/10 minutes 3-10 3.5.2 Molding Shrinkage After 48 h at 23 +/- 2 C Flow Cross Flow 0.6-2 0.9-2 % % 3.5.3 Coefficient of Linear Thermal Expansion Flow Cross Flow 1-15 1-15 E-5 mm/mm/ C E-5 mm/mm/ C 3.5.4 Impact Strength Multiaxial Max Load Energy at 23+/2 C Max Load Energy at -40+/2 C 11-
27、40 11-60 J J 3.5.5 Poissons Ratio 0.4 N/A 4.2 MATERIAL IDENTIFICATION FOR RECYCLING PURPOSES PP+EPDM (ISO 11469) ENGINEERING MATERIAL SPECIFICATION WSS-M4D979-B2/B3 Copyright 2013, Ford Global Technologies, LLC Page 6 of 7 Table 1: Minimum Sample Size Initial Approval New Manufacturing Location for
28、Previously Approved Material Para. Test Minimum Lots Specimens per Lot Total Test Specimens Lots Specimens per lot Total Test Specimens 3.1 WSS-M99P1111-A 3.1.2 WSS-M99P2222-D1/Latest Total Carbon, Hazardous Substances, Formaldehyde, Acraldehyde, Acetaldehyde (See below for Odor and Fogging) 1 1 1 p
29、er test 3.3.1 Weathering Resistance 1 1 1 3.3.2 Scratch Resistance 1 3 3 3.4.1 Density 1 3 3 1 3 3 3.4.2 Hardness, Durometer D 1 5 measurements 1 3.4.3 Tensile Strength at Break* 3 5 15 1 5 5 3.4.4 Elongation at Break* 3 5 15 1 5 5 3.4.5 Flexural Modulus* 3 10 30 1 10 10 3.4.6 Heat Aging Performance
30、 3.4.6.1 Tensile Strength at break Change 1 5 5 3.4.6.2 Elongation at break Change 1 5 5 3.4.7 Odor 1 9 9 3.4.8 Fogging Photometric 1 3 3 3.4.9 Flammability 1 5 5 3.5.1 Melt Flow Rate* 3 1 3 1 1 1 3.5.2 Mold Shrinkage 1 5 5 1 5 5 3.5.3 Coefficient of Linear Thermal Expansion (per condition) 1 3 3 3.
31、5.4 Impact Strength, Multiaxial (per condition)* 3 10 30 1 10 10 3.5.5 Poissons Ratio 1 5 5 3.5.6 Data Plots FTIR, TGA, DSC, CLTE 1 1 1 per test * For these requirements the 3 sigma value from the raw data is used to meet the requirements. ENGINEERING MATERIAL SPECIFICATION WSS-M4D979-B2/B3 Copyrigh
32、t 2013, Ford Global Technologies, LLC Page 7 of 7 Table 2: Minimum Color Property Testing 5. SUMMARY OF REVISIONS Para. Test Lots Specimens per Lot Total Test Specimens Color Test Direction 3.3.1 Weathering Resistance 1 1 1 Every color 3.3.2 Scratch Resistance 1 3 3 As directed by Materials Engineering 3.4.3 Tensile Strength at maximum load 1 5 5 As directed by Materials Engineering 3.4.5 Flexural Modulus 1 10 10 As directed by Materials Engineering 3.4.7 Odor 1 9 9 As directed by Materials Engineering 3.4.9 Flammability 1 5 5 Every color
