1、 WORLDWIDE ENGINEERING STANDARDS Material Specification GMW16826 Polyolefin Alloy - 1700 MPa Flexural Modulus, High Flow, Low Density Copyright 2013 General Motors Company All Rights Reserved January 2013 Page 1 of 4 1 Scope 1.1 Material Description. This standard covers the properties of a nominal
2、1700 MPa flexural modulus polyolefin alloy, high flow, low density, pellet form, black colored injection molding compound. For the purpose of this specification, polyolefin alloy is defined as an alloy of polypropylene plastic and ethylene/propylene (EP) or ethylene/propylene diene monomer (EPDM) ru
3、bber. 1.2 Symbols. The material abbreviation according to ISO 11469 is PP+EPDM-M12. 1.3 Typical Applications. Typical applications include the following: fully painted bumper fascias and rocker moldings. 2 References Note: Only the latest approved standards are applicable unless otherwise specified.
4、 2.1 External Standards/Specifications. ASTM D3763 ISO 179/1eA ISO 1133 ISO 3451-1 ASTM E228 ISO 294-1/2/3/4 ISO 1183 ISO 6603 ASTM E831 ISO 306 ISO 1873-2 ISO 11359 ISO 75-1/2/3 ISO 527-1/2 ISO 3167 ISO 11469 ISO 178 2.2 GM Standards/Specifications. GMW3013 GMW3059 GMW3221 2.3 Additional References
5、. TMC003 Material Safety Data Sheet guidance documents (available at ). 3 Requirements Materials approved to this specification shall meet the requirements of GMW3013, General Requirements for Handling of Technical Terms of Delivery for Plastics. 3.1 Requirements on Delivery. Important physical, mec
6、hanical and thermal properties that characterize the material are summarized in Table 1. Note: The requirements to Table 1 shall be documented for self-certification of the product according to GMW3013. The color shall be black if not otherwise specified on drawings, etc. 3.2 Requirements on Test Sp
7、ecimens. Unless otherwise specified, injection molding of test specimens shall be accomplished per ISO 294 with the conditions for injection molding from ISO 1873-2. Test methods and specimen dimensions are also to be in accordance with ISO 1873-2 with the following additions: use ISO 3167, Type A,
8、thickness 4 mm, for tensile and flexural properties. All tests shall be performed on specimens for 40 h minimum after molding and immediately following a conditioning period of 24 h minimum in a controlled atmosphere per GMW3221, Code A, unless otherwise specified. All tests shall be performed on un
9、annealed specimens. The values specified in Table 1 shall be met by test specimens in natural or black. 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. Copyright General Moto
10、rs Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW16826 Copyright 2013 General Motors Company All Rights Reserved January 2013 Page 2 of 4 3.2.1 Chemical Require
11、ments. All parts manufactured from molding compounds shall be resistant to the media they contact at their place of use. 3.2.2 Requirements on Materials. See Table 1. A minimum of 6 lots shall be tested to Table 1. The following are also required for full specification approval (the minimum number o
12、f lots per test required is1): Poissons Ratio Stress vs. Strain Curve at 23 C Multiaxial Impact Curves 3.3 Performance Requirements. Performance requirements, e.g., flammability, fogging or resistance to odor, shall be specified on part drawings or in component specifications. 3.4 Additional Testing
13、 Requirements. Materials approved to this specification will be required to have basic material properties generated so warp analysis modeling can be conducted. See GM engineer for details. 4 Manufacturing Process Not applicable. 5 Rules and Regulations 5.1 Legal Regulations. All materials must sati
14、sfy applicable laws, rules, regulations and recommendations valid in the country of usage. 5.2 Language. In the event of conflict between the English and domestic language, the English language shall take precedence. 5.3 Inspection and Rejection. Samples of components or materials released to a GM m
15、aterial specification shall be tested for conformity with the requirements of this material specification and approved by the responsible Engineering department prior to commencement of delivery of bulk supplies. A new approval must be received for any changes, e.g., properties, manufacturing proces
16、s, location of manufacture, etc. If not otherwise agreed, all testing and documentation normally required for initial release must be completed. It is the responsibility of the supplier to inform the customer in a timely manner, without solicitation, and to include documentation of all modifications
17、 of materials and/or processes and to apply for a new release. If not otherwise agreed, all release tests shall be repeated and documented by the supplier prior to commencement of delivery of non-conforming bulk supplies. In individual cases, a shorter test can be agreed to between the responsible E
18、ngineering department and the supplier. 5.4 Material Safety Data Sheets/Safety Data Sheets (MSDS/SDS). For new product submissions, or when a change in chemical composition of an existing product has occurred, a complete copy of the Material Safety Data Sheet/Safety Data Sheet must be submitted in c
19、ompliance with the Globally Harmonized System of Classification and Labeling of Chemicals (GHS) requirements or other country-specific MSDS/SDS requirements. In addition, product MSDS/SDS submissions must be in compliance with specific country General Motors TMC003 Material Safety Data Sheet/Safety
20、Data Sheet guidance documents where available. 5.5 All materials supplied to this standard must comply with the requirements of GMW3059, Restricted and Reportable Substances for Parts. 6 Approved Sources Materials supplied to this specification must be approved by General Motors. A list of approved
21、materials can be found in MATSPC. This GM Material File is provided to third parties to reduce redundant testing of materials. If approved material already listed is used, the part supplier can use GM Material File reference for Production Part Approval Process (PPAP) material approval. If the decis
22、ion is made to use a not yet approved material, contact for detail on the approval process. The material approval process must be completed prior to PPAP start date of the part supplied to General Motors. Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot f
23、or ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW16826 Copyright 2013 General Motors Company All Rights Reserved January 2013 Page 3 of 4 Table 1: Compound Properties (Black) Properties Standard Unit T1 T2 Mineral Filler Content (Ash
24、) ISO 3451-1, Method A at +600 C % by mass 10 to 14 Density ISO 1183, Method A g/cm 0.94 to 0.99 Melt Flow Rate (MFR) 230/2.16 ISO 1133 g/10 minutes 21 to 33 33 to 38 Melt Volume-Flow Rate (MVR) 230/2.16 ISO 1133 cm/10 minutes 26 to 34 35 to 45 Flexural Modulus ISO 178, 80 mm x 10 mm x 4 mm specimen
25、, 2 mm/minute test speed, 64 mm support span MPa 1550 to 1850 Tensile Modulus ISO 527-1/2, specimen 1A, 1 mm/minute test speed MPa 1550 to 1850 Tensile Stress at Yield ISO 527-1/2, specimen 1A, 50 mm/minute test speed MPa 13 Multiaxial Impact Strength at +23 C ASTM D3763, specimen C, 2.2 m/s impact
26、velocity J at maximum load 15 All failures must be ductile Multiaxial Impact Strength at -30 C ASTM D3763, specimen C, 2.2 m/s impact velocity J at maximum load 15 All failures must be ductile Multiaxial Impact Strength at +23 C ISO 6603-2/40/20/C/4.4. Sample to be either square 60 mm x 60 mm minimu
27、m, or circle 60 mm diameter minimum. Sample thickness to be 2 mm 0.1 mm. J at maximum load 8 All failures must be ductile (type YD or YS) Multiaxial Impact Strength at -30 C (or lowest temperature where only type YD or YS failures are observed) ISO 6603-2/40/20/C/4.4. Sample to be either square 60 m
28、m x 60 mm minimum, or circle 60 mm diameter minimum. Sample thickness to be 2 mm 0.1 mm. J at maximum load 13 All failures must be ductile (type YD or YS) Report Test Temperature Notched Charpy Impact at +23 C ISO 179/1eA kJ/m2 50 Notched Charpy Impact at -30 C ISO 179/1eA kJ/m2 5 Vicat Softening Te
29、mperature (VST)/A/50 ISO 306 C +120 Heat Deflection Temperature (HDT), Method A ISO 75-1, ISO 75-2, ISO 75-3 C +50 Coefficient of Linear Thermal Expansion (CLTE), longitudinal, +23 to +80 C for ISO 11359; -30 to +100 C for ASTM E831 and ASTM E228 ISO 11359 or ASTM E831 or ASTM E228 1/K 55 x 10-6 Shr
30、ink, 48 h after molding ISO 294-1, ISO 294-2, ISO 294-3, ISO 294-4, plaque size 101.6 mm x 152.0 mm x 3.2 mm (4 in x 6 in x 0.125 in). Any deviations to plaque size must be agreed upon with GM Engineering. % 0.525 to 0.675 Shrink, After Bake, 1 h at 82 C ISO 294-1, ISO 294-2, ISO 294-3, ISO 294-4, p
31、laque size 101.6 mm x 152.0 mm x 3.2 mm (4 in x 6 in x 0.125 in). Any deviations to plaque size must be agreed upon with GM Engineering. % 0.625 to 0.775 Shrink, After Bake, 1 h at 121 C ISO 294-1, ISO 294-2, ISO 294-3, ISO 294-4, plaque size 101.6 mm x 152.0 mm x 3.2 mm (4 in x 6 in x 0.125 in). An
32、y deviations to plaque size must be agreed upon with GM Engineering. % 0.725 to 0.875 YD = Yielding (zero slope at maximum force) followed by deep drawing YS = Yielding (zero slope at maximum force) followed by (at least partially) stable cracking Copyright General Motors Company Provided by IHS und
33、er license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW16826 Copyright 2013 General Motors Company All Rights Reserved January 2013 Page 4 of 4 7 Notes 7.1 Glossary. MATSPC: Global repository of G
34、M approved materials for corresponding GM Engineering Standards. 7.2 Acronyms, Abbreviations, and Symbols. APOPS Approved Paint on Parts Systems CLTE Coefficient of Linear Thermal Expansion EP Ethylene/propylene EPDM Ethylene/propylene diene monomer GHS Globally Harmonized System of Classification a
35、nd Labeling of Chemicals HDT Heat Deflection Temperature MFR Melt Flow Rate MPa Megapascals MSDS Material Safety Data Sheet MVR Melt Volume-Flow Rate PPAP Production Part Approval Process SDS Safety Data Sheet VST Vicat Softening Temperature YD Yielding (zero slope at maximum force) followed by deep
36、 drawing YS Yielding (zero slope at maximum force) followed by (at least partially) stable cracking 8 Coding System This standard shall be referenced in other documents, drawings, etc., as follows: Material per GMW16826P-PP+EPDM-M12-Tx, where x = Type 1 or 2, as defined in Table 1. 9 Release and Rev
37、isions This standard was originated in June 2012. It was first approved by Plastics Global Subsystem Leadership Team in September 2012. It was first published in September 2012. Issue Publication Date Description (Organization) 1 SEP 2012 Initial publication. 2 JAN 2013 Revised Melt Volume Flow Rate Values. (Plastics Global Subsystem Leadership Team) Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
