1、 WORLDWIDE ENGINEERING STANDARDS Material Specification GMW15188 Polyolefin Alloy - Weather Resistant, 1700 MPa Flexural Modulus, High Flow Copyright 2012 General Motors Company All Rights Reserved September 2012 Originating Department: North American Engineering Standards Page 1 of 6 1 Scope 1.1 Ma
2、terial Description. This standard covers the properties of a nominal 1700 MPa flexural modulus polyolefin alloy, high flow, pellet form, injection molding compound. For the purpose of this specification, polyolefin alloy is defined as an alloy of polypropylene plastic and ethylene/propylene (EP) or
3、ethylene/propylene diene monomer (EPDM) rubber. 1.1.1 Additional Characteristics. Materials certified to this standard may have additional characteristics, e.g., paintable, elastomer modified, etc. Possible additional characteristics are defined in GMW3013. 1.2 Symbols. The material abbreviation acc
4、ording to ISO 11469 is PP+EPDM-M20. 1.3 Typical Applications. Typical applications include the following: bumper fascias and rockers for mold-in-color (MIC) applications for accent colors, and two tone accent colored painted fascia where the MIC portion is the accent color. 2 References Note: Only t
5、he latest approved standards are applicable unless otherwise specified. 2.1 External Standards/Specifications. ASTM D3763 ISO 294-1 ISO 1133 ISO 6603 ASTM E228 ISO 294-2 ISO 1183 ISO 11359 ASTM E831 ISO 294-3 ISO 1873-2 ISO 11469 ISO 75-1/2/3 ISO 294-4 ISO 3167 SAE J1545 ISO 178 ISO 306 ISO 3451-1 S
6、AE J1976 ISO 179/1eA ISO 527-1/2 ISO 4892-1/2 SAE J2527-A ISO 294 2.2 GM Standards/Specifications. GMW3013 GMW3221 GMW14688 GMW16847 GMW3059 GMW14650 GMW14698 2.3 Additional References. TMC003 Material Safety Data Sheet guidance documents (available at ). 3 Requirements Materials approved to this st
7、andard shall meet the requirements of GMW3013, General Requirements for Handling of Technical Terms of Delivery for Plastics. 3.1 Requirements on Delivery. Important physical, mechanical and thermal properties that characterize the material are summarized in Table 1 and Table 2. Note: The requiremen
8、ts to Table 1 and Table 2 shall be documented for self-certification of the product according to GMW3013. The color shall be specified on drawings, in material specifications and otherwise. 3.2 Requirements on Test Specimens. Unless otherwise specified, injection molding of test specimens shall be a
9、ccomplished 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, thickness 4 mm for tensile and flexural properties. Copyright General Motors Compan
10、y Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHSGM WORLDWIDE ENGINEERING STANDARDS GMW15188 Copyright 2012 General Motors Company All Rights Reserved September 2012 Page 2 of 6 All tests shall be performed on sp
11、ecimens 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 unannealed specimens. The values specified in Table 1 shall be met by test specimens in natur
12、al 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. 3.2.1 Chemical Requirements. All parts manufactured from molding compounds shall be resistant to the media they c
13、ontact at their place of use. 3.2.2 Requirements on Materials. See Table 1 and Table 2. 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 Material Testing. Mate
14、rials approved to this specification will be required to have basic material properties generated so warp analysis modeling can be conducted. See GM Material Engineer for details. Table 1: Compound Properties (Black or Natural) Properties Standard Unit Values Mineral Filler Content (Ash) ISO 3451-1,
15、 Method A at +600 C % by mass 14 to 24 Density ISO 1183, Method A g/cm 1.00 to 1.04 Melt Flow Rate (MFR) 230/2.16 ISO 1133 g/10 minutes 19 to 27 Melt Volume-Flow Rate (MVR) 230/2.16 ISO 1133 cm/10 minutes 22.1 to 31.4 Flexural Modulus ISO 178, 80 mm x 10 mm x 4 mm specimen, 2 mm/minute test speed, 6
16、4 mm support span MPa 1550 to 1850 Tensile Modulus ISO 527-1/2, specimen 1A, 1 mm/ minute test speed MPa Report Results 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 velocity J at maximum l
17、oad 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 minimum, or circle 60 mm diam
18、eter minimum. Sample thickness to be 2 mm 0.1 mm. J Report Energy at Maximum Force and Type of Failure Multiaxial Impact Strength at -30 C (or lowest temp. where only type YD or YS failures are observed) ISO 6603-2/40/20/C/4.4. Sample to be either square 60 mm x 60 mm minimum, or circle 60 mm diamet
19、er minimum. Sample thickness to be 2 mm 0.1 mm. J Report Energy at Maximum Force and Type of Failure Report Test Temp. 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 Temperature (VST)/A/50 ISO 306 C +120 Copyright General Motors
20、 Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHSGM WORLDWIDE ENGINEERING STANDARDS GMW15188 Copyright 2012 General Motors Company All Rights Reserved September 2012 Page 3 of 6 Properties Standard Unit Va
21、lues 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 C to +80 C; -30 C to +100 C for ASTM E831 and ASTM E228 ISO 11359 or ASTM E831 or ASTM E228 1/K 55 x 10-6 Shrink, 48 h after molding ISO 294-1, ISO 29
22、4-2, 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, plaque size 101.6 mm x 152.0 mm x 3.2 mm (
23、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). Any deviations to plaque size must be agree
24、d upon with GM Engineering. % 0.725 to 0.875 Table 2: Compound Properties (Integrally Colored) Properties Standard Unit Value Multiaxial Impact Strength at +23 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 -30 C ASTM
25、 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 minimum, or circle 60 mm diameter minimum. Sample thickness to be 2 mm 0.1 mm. J Report Energy at Maximum
26、 Force and Type of Failure Multiaxial Impact Strength at -30 C (or lowest temp. where only type YD or YS failures are observed) ISO 6603-2/40/20/C/4.4. Sample to be either square 60 mm x 60 mm minimum, or circle 60 mm diameter minimum. Sample thickness to be 2 mm 0.1 mm. J Report Energy at Maximum F
27、orce and Type of Failure Report Test Temp. Natural Weather Resistance Note 1, Note 2, Note 3 Color Change Surface Defects 5 years exposure to direct weather in Arizona and Florida per SAE J1976 Procedure A. Measure color as defined in Note 3 below this table. Correlation of 5 years Natural Weatherin
28、g to Accelerated Weather Resistance is required. E 3.0 No objectionable defects allowed. Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for Resale-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW15188 Copyright 2012 General Motors Company All Rights Reserved
29、September 2012 Page 4 of 6 Properties Standard Unit Value Accelerated Weather Resistance Note 1, Note 3 Color Change Surface Defects Exposure to exterior Xenon arc Weatherometer per one of the following: SAE J2527-A, Extended ultraviolet (UV) Filters, 4500 kJ/m2 ISO 4892-1/2, 5400 kJ/m2 (GMW14650 We
30、atherometer Resistance Class 1) Measure color as defined in Note 3 below this table. E 3.0 No objectionable defects allowed. Accelerated Weather Resistance Note 1, Note 3 Color Change Surface Defects Exposure to exterior Xenon arc Weatherometer per one of the following: SAE J2527-A, Extended ultravi
31、olet (UV) Filters, 2500 kJ/m2 ISO 4892-1/2, 3000 kJ/m2 (GMW14650 Weatherometer Resistance Class 3) Measure color as defined in Note 3 below this table. E 0.75 No objectionable defects allowed. Scratch Resistance Five Finger Scratch Test per GMW14698. Sample plaque to be either GM Exterior Color Subm
32、ission Plaque, or to match the master plaques with the grains, colors and gloss levels as defined in the Color and Trim Design Appearance Release (CTDAR)-Sheet of the corresponding GM program. Arm No. 2 (15 N load) shall have a rating 3, and no whitening or objectionable defects. Scratch Resistance
33、GMW14688-A 10 N. Sample plaque to be either GM Exterior Color Submission Plaque, or to match the master plaques with the grains, colors and gloss levels as defined in the CTDAR-Sheet of the corresponding GM program. L 1.0 YD = Yielding (zero slope at maximum force) followed by deep drawing. YS = Yie
34、lding (zero slope at maximum force) followed by (at least partially) stable cracking. Note 1: In case of conflict between accelerated weathering and natural weathering, natural weathering results take precedence. Note 2: Alternate natural weathering sites may be used according to GMW16847. If altern
35、ate natural weathering sites are to be used, obtain agreement from the regional GM Engineering group prior to sending test samples out for exposure. Note 3: For integrally colored compounds, the color of each test specimen shall be measured per SAE J1545, CIELAB color space, 10 degrees observer, ill
36、uminant D65, specular included, sphere geometry, before and after exposures. In case of conflict between accelerated and natural weathering, natural weathering takes precedent. Prior to making measurements and observations on weathered specimens, wash the specimens with a solution consisting of 2 g
37、No. 7 Car Wash Concentrate (distributed by Armor All Products, Aliso Viejo, CA 92656) and 1 L deionized water 22 C 3 C. Use a soft sponge saturated with the solution and scrub the samples with a firm action. 4 Manufacturing Process Not applicable. 5 Rules and Regulations 5.1 Legal Regulations. All m
38、aterials must satisfy 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
39、released to a GM material 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, ma
40、nufacturing process, 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
41、 all modifications of materials and/or processes and to apply for a new release. Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHSGM WORLDWIDE ENGINEERING STANDARDS GMW15188 Copyrig
42、ht 2012 General Motors Company All Rights Reserved September 2012 Page 5 of 6 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 th
43、e responsible Engineering department and the supplier. 5.4 Initial Source Approval. No shipments shall be made by any supplier until representative initial production samples have been approved by the appropriate Materials Engineering department(s) as meeting the requirements of this specification.
44、5.5 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 compliance with the Globally Harmonized S
45、ystem 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 Data Sheet guidance documents where avai
46、lable. 5.6 All materials supplied to this standard must comply with the requirements of GMW3059, Restricted and Reportable Substances for Parts. 6 Approved Sources Engineering qualifications of an approved source are required for this standard. Only sources listed in the GM Materials File, MATSPC, u
47、nder this standard number have been qualified by Engineering as meeting the requirements of this standard. 7 Notes 7.1 Glossary. MATSPC: Global repository of GM approved materials for corresponding GM Engineering Standards. 7.2 Acronyms, Abbreviations, and Symbols. APOPS (GM) Approved Paint on Parts
48、 System CLTE Coefficient of Liner Thermal Expansion CTDAR Color and Trim Design Appearance Release EP Ethylene/Propylene EPDM Ethylene/Propylene Diene Monomer GHS Globally Harmonized System of Classification and Labeling of Chemicals GMNA General Motors North America HDT Heat Deflection Temperature
49、MFR Melt Flow Rate MIC Mold-in-Color MPa MegaPascal MSDS Material Safety Data Sheet MVR Melt Volume-Flow Rate SDS Safety Data Sheet UV Ultraviolet VST Vicat Softening Temperature 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 8 Coding System This standard shall be referenced in other documents, drawings, etc., as follows: Material
