1、 ENGINEERING MATERIAL SPECIFICATION Date Action Revisions Rev. 1 2017 07 29 Revised See Summary of Revisions A. Wagenhals, NA 2013 03 14 Released T.Nover, M.Corley, V. Cerato; FoE Controlled document at www.MATS Copyright 2017, Ford Global Technologies, LLC Page 1 of 8 THERMOPLASTIC ELASTOMERIC MOLD
2、ING COMPOUND WSS-M4D979-B2 UNPAINTED STEERING WHEEL/SIDE AIRBAG 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 wa
3、s released originally for unpainted airbag covers with high sun 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 b
4、e used for airbag covers with low sun exposure such as knee airbag 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 APPROVED
5、SOURCES This specification requires the use of approved sources. Only the sources identified on the Ford Approved Source List (ASL) can be used when this specification is listed on the drawing, CAD file, or other documents. The list of approved sources is located within Ford at or available externa
6、lly through a Ford Materials Engineer. Approval of new sources requires the completion of the latest version of the FMD template. Data should be submitted at the time as the specification data package. Only one FMD package is required per trade name approved, FMD is not required for each manufacturi
7、ng site. FMD is required for new site approvals that do not have an extisting FMD record. 3.2 CONDITIONING AND TEST CONDITIONS All test values are based on material conditioned for not less than 24 h prior to testing in a controlled environment of 23 +/- 2 C and 50 +/- 5% relative humidity. Testing
8、of the material should occur in the conditioning environment or soon after removal. 3.3 INFRARED SPECTROPHOTOMETRY AND/OR THERMAL ANALYSIS ENGINEERING MATERIAL SPECIFICATION WSS-M4D979-B2/B3 Copyright 2017, Ford Global Technologies, LLC Page 2 of 8 IR spectra and thermograms from initial material ap
9、proval shall constitute the reference standard and shall be kept on file at the designated material laboratory. The material supplier shall ensure that all future material supplied to the specification shall produce IR spectra and thermograms that correspond to the reference standard when tested und
10、er the same conditions. 3.4 STANDARD REQUIREMENTS FOR PRODUCTION MATERIALS 3.4.1 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 minimum, maximum or range was
11、established using 3 sigma data. For 2011 and beyond, refer to Table 1 for number of samples required for each test. 3.4.2 This specification is based on virgin material and does not allow the addition of recycled content (PIR/PCR). 3.4.3 The use of regrind is permitted, for economic / environmental
12、reasons. Part manufacturers using this specification must complete DV and PV testing with the allowable amount of regrind and the maximum allowable regrind content must be specified on the engineering drawing. Any changes to what is specified on the drawing (no specific amount implies zero regrind)
13、must be approved by Materials and PD Engineering through the formal Ford Motor Company process (SREA) or Engineering Notice. 3.4.5 Materials requiring High Strain Rate, Creep or fiber oriented Tensile Modulus may be required to test to the requirements of WSS-M99D68-A1/Latest, Thermoplastic Property
14、 Determination For CAE, High Strain Rate Tensile, Creep and Tensile Modulus. Material Suppliers should be prepared to submit data upon request. 3.4.6 Performance Criteria: Parts using this specification shall meet the appropriate performance specifications, WSS- M15P5-H/Latest. 3.4.7 Ford Materials
15、Engineering may request a Control Plan and Certificate of Analysis (C of A) containing lot testing requirements which must include, but are not limited to: Melt Flow Rate Impact Strength, Notched Charpy at 23 C Flexural Modulus 3.5 SAMPLE PREPARATION Unless otherwise specified all tests shall be car
16、ried 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 annealing 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 +/-
17、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 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
18、 diameter x 3.2 +/- 0.2 mm Specimen I 100 mm x 150 mm, min ENGINEERING MATERIAL SPECIFICATION WSS-M4D979-B2/B3 Copyright 2017, Ford Global Technologies, LLC Page 3 of 8 3.6 APPEARANCE 3.6.1 Weathering Resistance (Interior, unpainted) Rating 4 min (FLTM BO 116-01, exposure in kJ/m2 B2 B3 Specimen C f
19、rom 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 any spewing or other exudati
20、on. 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 for additional color durability
21、 submission requirements. 3.6.2 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 Materials Engineering. Details reg
22、arding color house, let down ratio, colors, grain, etc can be found in the approval package. 3.7 MATERIAL PROPERTIES 3.7.1 Density 0.87 0.93 g/cm3 (ISO 1183, Method A) 3.7.2 Hardness, Durometer D 39 - 54 (ISO 868, 15 s dwell) 3.7.3 Tensile Strength at Break 7 - 25 MPa (ISO 527-1 and ISO 527-2, Speci
23、men A, 50 mm/minute test speed) 3.7.4 Elongation at Break 300 % min (ISO 527-1 and ISO 527-2, Specimen A, 50 mm/minute test speed) 3.7.5 Flexural Modulus 185 MPa min (ISO 178, Specimen D, 64 mm support span, 2 mm/minute test speed) 3.7.6 Heat Aging Performance (ISO 188, 150 +/- 50 air changes/h, 100
24、0 h at WSS-M4D979-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. Unaged property values shall be determined at the time of the aged properties ENGINEERING MATERIAL SPECIFICATION WSS-M4D979-B2/B3 Copyright 20
25、17, Ford Global Technologies, LLC Page 4 of 8 determination) 3.7.6.1 Tensile Strength at break, Change +/- 25% max (Test Method per para 3.4.3) 3.7.6.2 Elongation at break +/- 25% max (Test Method per para 3.4.4) 3.7.7 Odor Rating 3 max (FLTM BO 131-03, Variant C, Specimen G) 3.7.8 Fogging Photometr
26、ic (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. 3.7.9 Flammability (ISO 3795/SAE J369, Specimen B, smooth surface) Burn Rate 100 mm/minute max 3.8 MATERIAL PROPER
27、TIES REPORT ONLY Values are retained in Ford Materials Database . 3.8.1 Melt Flow Rate Report Value (ISO 1133 230 C, 2,16 kg) g/10 minutes 3.8.2 Molding Shrinkage (Report method used, sample size and value) After 48 h at 23 +/- 2 C Flow Report Value, % Cross Flow Report Value, % 3.8.3 Coefficient of
28、 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 3.8.4 Impact Strength Multiaxial (ASTM D 3763, Impact velocity: 6.6 m/s Specimen E, smooth surface injection molded specimen) Max Load Energy at 23 +/-
29、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 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 fr
30、om the ENGINEERING MATERIAL SPECIFICATION WSS-M4D979-B2/B3 Copyright 2017, Ford Global Technologies, LLC Page 5 of 8 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 shall be conducted within the sa
31、me 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. 3.8.5 Poissons Ratio Report Ratio (ISO 527-1 and ISO 527-2, Specimen A, 1 mm/minute test speed)
32、3.8.6 Supplemental Information The following curves are to be submitted with the data packages: FTIR TGA DSC CLTE Engineering Stress/Strain at 23 C, -40 C, and WSS-M4D979-B2: 110+/- 2 C. WSS-M4D979-B3: 100+/- 2 C. 4. GENERAL INFORMATION The information given below is provided for clarification and a
33、ssistance in meeting the requirements of this specification. Contact for questions concerning Engineering Material Specifications. 4.1 TYPICAL PROPERTIES USING METHODS IN SECTION 3.8 Para. Test Typical Value Units 3.8.1 Melt Flow Rate g/10 minutes 3-10 3.8.2 Molding Shrinkage After 48 h at 23 +/- 2
34、 C Flow Cross Flow 0.6-2 0.9-2 % % 3.8.3 Coefficient of Linear Thermal Expansion Flow Cross Flow 1-15 1-15 E-5 mm/mm/ C E-5 mm/mm/ C 3.8.4 Impact Strength Multiaxial Max Load Energy at 23+/2 C Max Load Energy at -40+/2 C 11-40 11-60 J J 3.8.5 Poissons Ratio 0.4 N/A 4.2 MATERIAL IDENTIFICATION FOR RE
35、CYCLING PURPOSES PP+EPDM (ISO 11469) ENGINEERING MATERIAL SPECIFICATION WSS-M4D979-B2/B3 Copyright 2017, Ford Global Technologies, LLC Page 6 of 8 4.3 APPROVAL OF MATERIALS Suppliers desiring approval of their materials shall first obtain an expression of interest from Purchasing, Design or Product
36、Development, and Materials Engineering. The supplier shall submit a completed copy of their laboratory test reports, signed by a qualified and authorized representative of the test facility, demonstrating full compliance with all the requirements of the Material Specification. Tested material sample
37、s must be available for review upon request and kept for a minimum of one year. Upon request, the supplier will review the associated quality control documents (Process Failure Mode and Effects Analysis, Control Plans, Certification testing) with Ford. 4.4 SUPPLIERS ONGOING RESPONSIBILITY All materi
38、als must be equivalent in all characteristics to the material upon which approval was originally granted. Prior to making any changes to the material originally approved, whether or not such changes affect the materials ability to meet the specification requirements, the supplier shall notify the af
39、fected Supplier Technical Assistance (STA), Purchasing, and Materials Engineering activities of the proposed changes (with reasons) by submission of a completed Suppliers Request for Engineering Approval, SREA. For parts and components using Ford Engineering Material Specifications, all samples test
40、ed to the specifications for Design Verification (DV), Production Verification (PV) and Production Part Approval Process (PPAP) sign off must be kept until Job 1. 4.5 RESTRICTED SUBSTANCE MANAGEMENT STANDARD Substance restrictions imposed by regulations or Company direction applies to the materials
41、addressed by this document. The restrictions are identified in the Restricted Substance Management Standard WSS-M99P9999-A1 which is updated yearly. It is the suppliers responsibility to comply with this standard on a continuing basis through IMDS and or GMAP reporting. ENGINEERING MATERIAL SPECIFIC
42、ATION WSS-M4D979-B2/B3 Copyright 2017, Ford Global Technologies, LLC Page 7 of 8 Table 1: Minimum Sample Size Initial Approval New Manufacturing Location for Previously Approved Material Para. Test Minimum Lots Specimens per Lot Total Test Specimens Lots Specimens per lot Total Test Specimens 3.6.1
43、Weathering Resistance 1 1 1 3.6.2 Scratch Resistance 1 3 3 3.7.1 Density 1 3 3 1 3 3 3.7.2 Hardness, Durometer D 1 5 measurements 1 3.7.3 Tensile Strength at Break* 3 5 15 1 5 5 3.7.4 Elongation at Break* 3 5 15 1 5 5 3.7.5 Flexural Modulus* 3 10 30 1 10 10 3.7.6 Heat Aging Performance 3.7.6.1 Tensi
44、le Strength at break Change 1 5 5 3.7.6.2 Elongation at break Change 1 5 5 3.7.7 Odor 1 9 9 3.7.8 Fogging Photometric 1 3 3 3.7.9 Flammability 1 5 5 3.8.1 Melt Flow Rate* 3 1 3 1 1 1 3.8.2 Mold Shrinkage 1 5 5 1 5 5 3.8.3 Coefficient of Linear Thermal Expansion (per condition) 1 3 3 3.8.4 Impact Str
45、ength, Multiaxial (per condition)* 3 10 30 1 10 10 3.8.5 Poissons Ratio 1 5 5 3.8.6 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 Copyright 2017, Ford G
46、lobal Technologies, LLC Page 8 of 8 Table 2: Minimum Color Property Testing 5. SUMMARY OF REVISIONS 2017 07 27 Changed hardness minimum Increased tensile strength at break maximum Lowered flexural modulus minimum Updated generic paragraphs in section 4 Deleted VIEQ Requirement Added standard paragra
47、phs per M4D template 3.1-3.4 and 4.3-4.5. Para. Test Lots Specimens per Lot Total Test Specimens Color Test Direction 3.6.1 Weathering Resistance 1 1 1 Every color 3.6.2 Scratch Resistance 1 3 3 As directed by Materials Engineering 3.7.3 Tensile Strength at maximum load 1 5 5 As directed by Materials Engineering 3.7.5 Flexural Modulus 1 10 10 As directed by Materials Engineering 3.7.7 Odor 1 9 9 As directed by Materials Engineering 3.7.9 Flammability 1 5 5 Every color
