GMNA-GMP.TES.014-2005.pdf

ENGINEERING STANDARDS Material Specification Plastics GMP.TES.014 Thermoplastic Elastomer - Styrene Block Copolymer, Shore D34, 240 MPa Flexural Modulus, Interior, Integrally Colored © Copyright 2005 General Motors Corporation All Rights Reserved August 2005 Originating Department: North American Engineering Standards Page 1 of 3 1 Scope This specification covers the properties of a natural, UV stabilized thermoplastic elastomer consisting of polypropylene and SEBS (styrene/ethylene/butylene/styrene) rubber for interior applications. 1.1 Typical Application. Typical applications include the following: molded-in-color airbag covers. 2 References Note: Only the latest approved standards are applicable unless otherwise specified. 2.1 External Standards/Specifications. ASTM D3763 ISO 1183 ISO 34-1 SAE J1545 ISO 37 SAE J1639 ISO 178 SAE J1885 ISO 868 SAE J2236 2.2 GM Standards/Specifications. GM1002M GMW3059 GM9305P GMW3221 GMW3001 3 Requirements 3.1 Requirements on Delivery. Important physical, mechanical and thermal properties that characterize the material are summarized in charts. The color shall be specified on drawings, in material specifications and otherwise. 3.2 Requirements on Test Specimens. Tests shall be conducted using the latest issue of the test methods indicated. Suitable precautions should be taken to ensure that applicable safe limits are not exceeded when conducting test procedures, processes, and/or handling the materials required by this specification. Test specimens shall be die cut from fan gated injection molded plaques having a nominal thickness of 2.0 ± 0.2 mm. Die cut specimens are to be tested with the long axis of the test specimen perpendicular to the direction of flow. Plaque dimensions must be sufficient to permit this. Tests shall be conducted 40 h minimum after molding and immediately following a conditioning period of 24 h minimum per GMW3221 Code A, unless otherwise specified. All tests shall be performed on unannealed specimens. In addition, tests specified at temperatures below or above 22 ± 3 °C shall be conducted at the specified temperature using specimens conditioned at the specified temperature for 4 h minimum. The minimum values specified in the property tables must be met by test specimens in natural, black, or in a standard sampled color if natural or black are not available. For colored grades where other pigment and additive systems (e.g., stabilizer) are used, the impact values shall not decrease more than 10 % from the specified minimum value. 3.3 Compound Properties. See Table 1 and Table 2. 4 Manufacturing Process Not applicable. 5 Rules and Regulations 5.1 All materials supplied to this specification must comply with the requirements of GMW3001, Rules and Regulations for Material Specifications and GM1002M, Standard Requirements Plastics. 5.2 All materials supplied to this specification must comply with the requirements of GMW3059, Restricted and Reportable Substances for Parts. 6 Approved Sources Engineering qualification of an approved source is required for this specification. Only sources listed in the GM Materials File (i.e., MATSPC) under this specification number have been Copyright General Motors North America Provided by IHS under license with GM Licensee=IHS Employees/1111111001, User=Japan, IHS Not for Resale, 06/23/2008 23:31:01 MDTNo reproduction or networking permitted without license from IHS -,-,- GMP.TES.014 GM ENGINEERING STANDARDS © Copyright 2005 General Motors Corporation All Rights Reserved Page 2 of 3 August 2005 qualified by engineering as meeting the requirements of this specification. Table 1: Compound Properties (Natural) Mechanical Properties Test Methods Unit Values Shore D Hardness ISO 868, 15 s delay Shore D34 +/- 3 Specific Gravity ISO 1183 0.90 to 0.92 Tensile Stress at break ISO 37, Type 1 dumbbell, 500 mm/minute MPa 10.4 min Elongation at Break ISO 37, Type 1 dumbbell, 500 mm/minute % 560 min Tensile Stress at 100 % Elongation ISO 37, Type 1 dumbbell, 500 mm/minute MPa 7.0 min Tear Strength ISO 34-1, Method B, angle die, 500 mm/minutekN/m 63 min Flexural Modulus ISO 178, 50 mm span, 2 mm/minute test speed, chord modulus using 0.5 to 2.5 mm strain -30°C +22°C +70°C MPa 730 max 185 to 245 55 min Properties After Heat Aging Tensile Strength Elongation at Break SAE J2236, 1008 h at 110°C in an air- circulating oven followed by indicated property testing at 23°C. Test methods are the same as for original mechanical property testing. Change in property % % No objectionable color change or tackiness. 85 retention min 60 retention min Fogging Number GM9305P, Type B, 95°C % 70 min Colorfastness to Light Change in Color Surface Defects Xenon Arc per SAE J1885, 1240.8 kJ/m2 E 3.0 No objectionable defects allowed Multiaxial Impact at +23°C, Total Energy ASTM D3763, 6.6 m/s, Ref. SAE J1639 Joules 18 min. at max load Failures must be ductile Multiaxial Impact at -40°C, Total Energy ASTM D3763, 6.6 m/s, Ref. SAE J1639 Joules 14 min. at max load Failures must be ductile Copyright General Motors North America Provided by IHS under license with GM Licensee=IHS Employees/1111111001, User=Japan, IHS Not for Resale, 06/23/2008 23:31:01 MDTNo reproduction or networking permitted without license from IHS -,-,- GM ENGINEERING STANDARDS GMP.TES.014 © Copyright 2005 General Motors Corporation All Rights Reserved August 2005 Page 3 of 3 Table 2: Compound Properties (Integrally Colored) Additional Performance Properties Test Methods Unit Value Fogging Number GM9305P, Type B, 95°C % 70 min Colorfastness to Light Change in Color Surface Defects Xenon Arc per SAE J1885, 1240.8 kJ/m2 E 3.0 No objectionable defects allowed Multiaxial Impact at -40°C, Total Energy ASTM D3763, 6.6 m/s, Ref. SAE J1639 Joules 14 min. at max load Failures must be ductile Note 1: For integrally colored compounds, the color of each test specimen shall be measured per SAE J1545, CIELAB color space, 10 degree° observer, illuminant D65, specular included, sphere geometry, before and after exposures. In case of conflict between accelerated and natural weathering, natural weathering takes precedent. 7 Coding System This material specification shall be referenced in other documents, drawings, VTS, CTS, etc. as follows: Material per GMP.TES.014 8 Release and Revisions 8.1 Release. This material specification originated in September 1998 and was approved by the 90A TPE Specialist Team in September 1998. It was first published in September 1998. 8.2 Revisions. Rev Approval Date Description (Organization) A JUN 2003 ISO Conversion; revised title (TPE Materials Specialist) B AUG 2005Revise Title and Table 1; Added GMW3221 and GM1002M (TPE Material Specialist) Copyright General Motors North America Provided by IHS under license with GM Licensee=IHS Employees/1111111001, User=Japan, IHS Not for Resale, 06/23/2008 23:31:01 MDTNo reproduction or networking permitted without license from IHS -,-,-