1、 WORLDWIDE ENGINEERING STANDARDS Material Specification GMW16657 Polyoxymethylene Copolymer - Low Gloss Copyright 2011 General Motors Company All Rights Reserved September 2011 Originating Department: North American Engineering Standards Page 1 of 5 1 Scope 1.1 Material Description. This standard de
2、scribes low gloss, unfilled, heat stabilized, polyoxymethylene copolymers which are used in injection molded components. 1.2 Symbols. The material abbreviation according to ISO 11469 is POM 10% MPa 35 Tensile Elongation at Break ISO 527-1/2, Specimen ISO 3167, 4 mm thick Type A bar, Test speed 50 mm
3、/minute; if tensile strain at yield or break 10% % Report Poissons Ratio ISO 527-1/2, Specimen ISO 3167, 4 mm thick Type A bar, Tensile method, Test speed 1 mm/minute No units Report Flexural Modulus +22 C ISO 178, Specimen 80 x 10 x 4 mm, 2 mm/minute, 64 mm span, chord (0.05 to 0.25% strain) MPa Re
4、port one lot Notched Charpy Impact Strength at 22 C ISO 179/1eA, Specimen Machined V-notch, r = 0.25 mm, 80 x 10 x 4 mm kJ/m2 2.5 Notched Charpy Impact Strength at -30 C ISO 179/1eA, Specimen Machined V-notch, r = 0.25 mm, 80 x 10 x 4 mm kJ/m2 2 Melt Mass-Flow Rate (MFR) or Melt Volume-Flow Rate (MV
5、R) ISO 1133, Temperature and load defined in 190 C and 2.16 kg load g/10 minutes or cm3/ 10 minutes 11 to 17 g/10 minutes 8 to 13 cm3/10 minutes Mold Shrink - longitudinal - 48 h after Molding ISO 294-3/4, plaque size 60 x 60 x 2 mm type D2 preferred or larger with maximum thickness 4 mm % Report on
6、e lot Mold Shrink - transverse - 48 h after Molding ISO 294-3/4, Plaque size 60 x 60 x 2 mm type D2 preferred or larger with maximum thickness 4 mm % Report one lot Heat Deflection Temperature (HDT) - 0.45 MPa ISO 75-1/2, Method B, Specimen 80 x 10 x 4 mm, test flatwise, unannealed (only if required
7、 in specification) C 130 HDT - 1.8 MPa ISO 75-1/2, Method A, Specimen 80 x 10 x 4 mm, test flatwise, unannealed C 70 Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWI
8、DE ENGINEERING STANDARDS GMW16657 Copyright 2011 General Motors Company All Rights Reserved September 2011 Page 3 of 5 Property Standard Note 1 Units Requirement Vicat Softening Temperature ISO 306, Specimen 10 x 10 x 4 mm, Heating rate 50 K/h, Load 50 N C Report one lot Melting Temperature ISO 3146
9、 Method A, Method B, Method C Differential Scanning Calorimeter (DSC) or Differential Thermal Analyzer (DTA) at 10K/minute C 160 Coefficient of Linear Thermal Expansion (CLTE) - Parallel (Flow) ASTM E831 or ISO 11359-2 Thermal Mechanical Analyzer (TMA), TMA, Mean secant value over the temperature ra
10、nge -30 to +110 C 10-6 mm/mm/C Report one lot CLTE - Normal (Cross Flow) ASTM E831 or ISO 11359-2 (TMA), TMA, Mean secant value over the temperature range -30 to +110 C 10-6 mm/mm/C Report one lot Tensile Strength Retention after Heat Aging 1000 h 110 C ISO 527-1/2 Sample: 150 x 10 x 4 mm thick Type
11、 A bar test speed 50 mm/minute % 75 Tensile Elongation at break retention after Heat Aging 1000 h 110 C ISO 527-1/2 Sample: 150 x 10 x 4 mm thick Type A bar test speed 50 mm/minute % 75 Flammability GMW3232 or ISO 3795 report per requirements of GMW3232, Sample 355 2 mm by 100 2 mm, 2 0.2 mm thick m
12、m/minute 100 Chemical Resistance GMW14334-A No Units Rating 1 Aldehyde and Ketone Emissions GMW15635 mg/kg 10 Fogging GMW3235-B condensable constituents mg 2 Note 1: Standard test specimen and test setup should follow GMW3013. Table 2: Compound Properties (Integrally Colored) Note 2 Property Standar
13、d Note 1 Units Requirement Colorfastness to Light, Natural Weathering GMW3417-L1-F2-G1-105 000 Temperature Normalized Radiation (TNR) langleys at +105 C Delta E 3.0 No objectionable defects allowed Colorfastness to Light, Accelerated SAE J1885, 1240.8 kJ/m2 or GMW14162 Cycle C, 115 C 19 MJ/m Delta E
14、 3.0 No objectionable defects allowed or Rating 4 minimum (also, there shall be no more than a noticeable change in hue or chroma, and no objectionable tackiness, blotchiness, loss of grain, wrinkling, or other undesirable effects) Notched Charpy Impact Strength at 22 C ISO 179/1eA, Specimen Machine
15、d V-notch, r = 0.25 mm, 80 x 10 x 4 mm kJ/m2 2 Flammability GMW3232 or ISO 3795 report per requirements of GMW3232, Sample 355 2 mm by 100 2 mm, 2 0.2 mm thick mm/minute 100 Note 1: Standard test specimen and test setup should follow GMW3013. Note 2: Only test for interior performance, usage for ext
16、erior components should be kept to zero or extremely low weatherability performance areas of the vehicle as determined by materials engineer responsible for each part. 4 Manufacturing Process Not applicable. Copyright General Motors Company Provided by IHS under license with General Motors CompanyNo
17、t for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW16657 Copyright 2011 General Motors Company All Rights Reserved September 2011 Page 4 of 5 5 Rules and Regulations 5.1 Legal Regulations. All materials must satisfy applicable laws,
18、 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 material specificatio
19、n 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 process, location of manuf
20、acture, 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 of materials and/or
21、 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 Engineering departmen
22、t 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. 5.5 Material Safety Data Sheets/Saf
23、ety 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 System of Classification and Labelin
24、g 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 available. 5.6 All materials supplied t
25、o 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) under this standard number have been
26、 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. ABS Acrylonitrile Butadiene Styrene CLTE Coefficient of Linear Therma
27、l Expansion DSC Differential Scanning Calorimeter DTA Differential Thermal Analyzer GHS Globally Harmonized System HDT Heat Deflection Temperature MFR Mass-Flow Rate MVR Melt Volume-Flow Rate MSDS Material Safety Data Sheet SDS Safety Data Sheet TMA Thermal Mechanical Analyzer TNR Temperature Normal
28、ized Radiation Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW16657 Copyright 2011 General Motors Company All Rights Reserved September
29、2011 Page 5 of 5 8 Coding System This standard shall be referenced in other documents, drawings, etc., as follows: Material per GMW16657 GMW = General Motors Worldwide 16657 = Sequential number 9 Release and Revisions This standard was originated in August 2011. It was first approved by the Plastics
30、 Global Subsystem Leadership Team in August 2011. It was first published in September 2011. Issue Publication Date Description (Organization) 1 SEP 2011 Initial publication. Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
