1、 WORLDWIDE ENGINEERING STANDARDS Material Specification GMW16827 Polyolefin Alloy - 1700 MPa Flexural Modulus, Weather Resistant, High Flow, Low Density Copyright 2013 General Motors Company All Rights Reserved January 2013 Page 1 of 6 1 Scope 1.1 Material Description. This standard covers the prope
2、rties of a nominal 1700 MPa flexural modulus polyolefin alloy, exterior weather resistant, high flow, low density, 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 ethylene/
3、propylene diene monomer (EPDM) rubber. 1.2 Symbols. The material abbreviation according to ISO 11469 is PP+EPDM-M12. 1.3 Typical Applications. Typical applications include the following: bumper fascias and rocker moldings for mold-in-color (MIC) applications for accent colors, and two tone accent co
4、lored painted fascia, where the MIC portion is the accent color. 2 References Note: Only the latest approved standards are applicable unless otherwise specified. 2.1 External Standards/Specifications. ASTM D3763 ISO 294-1/2/3/4 ISO 1873-2 ISO 11359 ASTM E228 ISO 306 ISO 3167 ISO 11469 ASTM E831 ISO
5、527-1/2 ISO 3451-1 SAE J1545 ISO 75-1/2/3 ISO 1133 ISO 4892-1/2 SAE J1976 ISO 178 ISO 1183 ISO 6603 SAE J2527-A ISO 179/1eA 2.2 GM Standards/Specifications. GMW3013 GMW3221 GMW14650 GMW14698 GMW3059 GMW14444 GMW14688 GMW16847 2.3 Additional References. TMC003 Material Safety Data Sheet guidance docu
6、ments (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, mechanical and thermal properties that characterize
7、the material are summarized in Table 1 and Table 2. Note: The requirements to Table 1 and Table 2 shall be documented for self-certification of the product according to GMW3013. 3.2 Requirements on Test Specimens. Unless otherwise specified, injection molding of test specimens shall be accomplished
8、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. All tests shall be performed on specimens
9、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. Copyright General Motors Company Provided by IHS under license with General Mot
10、ors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW16827 Copyright 2013 General Motors Company All Rights Reserved January 2013 Page 2 of 6 The values specified in Table 1 shall be met by test specimens in natural or bl
11、ack. 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 contact a
12、t their place of use. 3.2.2 Requirements on Materials. See Table 1 and Table 2. A minimum of six lots shall be tested to Table 1. A minimum of one lot shall be tested to Table 2. The following are also required for full specification approval (the minimum number of lots per test required is one): Po
13、issons 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. All finished parts for interior applications shall meet
14、the requirements according to GMW14444. This shall be noted on the Certification Statement with Code Letter U. All finished parts for exterior applications shall meet the requirements according to GMW14650. This shall be noted on the Certification Statement with Code Letter L. 3.4 Additional Testing
15、 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
16、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
17、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
18、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
19、 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
20、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
21、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
22、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. Copyright General M
23、otors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW16827 Copyright 2013 General Motors Company All Rights Reserved January 2013 Page 3 of 6 A list of approved
24、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
25、ion is made to use a not yet approved material, contact GM Materials Engineering 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. Table 1: Compound Properties (Black or Natural) Properties Standard Un
26、it T1 T2 Mineral Filler Content (Ash) 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 IS
27、O 178, 80 mm x 10 mm x 4 mm specimen, 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 AST
28、M 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 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 b
29、e either square 60 mm x 60 mm minimum, 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/
30、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 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 IS
31、O 179/1eA kJ/m2 5 Vicat Softening Temperature (VST)/A/50 ISO 306 C +120 Heat Deflection Temperature (HDT), Method A ISO 75-1, ISO 75-2, ISO 75-3 C +50 Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted witho
32、ut license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW16827 Copyright 2013 General Motors Company All Rights Reserved January 2013 Page 4 of 6 Properties Standard Unit T1 T2 Coefficient of Linear Thermal Expansion (CLTE), longitudinal, +23 C to +80 C for ISO 11359; -30 C to +100 C for ASTM E
33、831 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 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
34、, 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 (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
35、, plaque size 101.6 mm x 152.0mm 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. % 0.725 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
36、) stable cracking 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 D3763, specimen C, 2.2 m/s
37、 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 8 All failures must be ductile (type YD or YS) Mult
38、iaxial 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 mm x 60 mm minimum, or circle 60 mm diameter minimum. Sample thickness to be 2 mm 0.1 mm. J 13 All failures must be ductile (type YD or YS) Rep
39、ort Test Temperature 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 Weathering to Accelerated Weat
40、her Resistance is required. 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 ultraviolet (UV) filters, 4500 kJ/m2 ISO 4892-1/2, 5400 kJ/m2 (G
41、MW14650 Weatherometer Resistance Class 1) Measure color as defined in Note 3 below this table. E 3.0 No objectionable defects allowed. Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from
42、IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW16827 Copyright 2013 General Motors Company All Rights Reserved January 2013 Page 5 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
43、 following: SAE J2527-A, Extended ultraviolet (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 p
44、laque 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 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
45、objectionable defects. Scratch Resistance GMW14688-A-10 N. Sample plaque for General Motors North America to be 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 maximum No
46、te 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 alternate natural weathering sites are to be used, obtain agreement from the regional GM Engin
47、eering 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, illuminant D65, specular included, sphere geometry, before and after exposures. In case of
48、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 No. 7 Car Wash Concentrate (distributed by Armor All Products, Aliso Viejo, CA 92656) an
49、d 1 L deionized water 22 C 3 C. Use a soft sponge saturated with the solution and scrub the samples with a firm action. 7 Notes 7.1 Glossary. MATSPC: Global repository of GM approved materials for corresponding GM Engineering Standards. 7.2 Acronyms, Abbreviations, and Symbols. CLTE Coefficient of Linear Thermal Expansion CTDAR Color and Trim Design Appearance Release E
