1、 WORLDWIDE ENGINEERING STANDARDS Material Specification GMW16924 Interior Low Emission Polyoxymethylene Copolymer, UV Stabilized, and Heat Stabilized Copyright 2013 General Motors Company All Rights Reserved February 2013 Page 1 of 5 1 Scope 1.1 Material Description. Polyoxymethylene copolymer desig
2、ned to meet the global emission requirements for interior materials. 1.2 Symbols. All plastic parts must have legible plastic compound identification symbol per GMW3116 and ISO 11469 requirements. Mark must appear on the surface and must not affect form, fit, or function. 1.3 Typical Applications. P
3、arts located within the refreshable air space of the vehicle interior. 1.4 Remarks. Not applicable. 1.5 Types. The following types apply to this specification: C1 - low melt flow C2 - medium low melt flow C3 - medium high flow C4 - high melt flow 2 References Note: Only the latest approved standards
4、 are applicable unless otherwise specified. 2.1 External Standards/Specifications. ISO 75-1/2 ISO 294-3/4 ISO 1183 ISO 3795 ISO 179/1eA ISO 527-1/2 ISO 3146 ISO 9988-2 ISO 188 ISO 1133 ISO 3167 ISO 11469 ISO 294 2.2 GM Standards/Specifications. GMW3013 GMW3221 GMW3417 GMW15634 GMW3059 GMW3232 GMW141
5、62 GMW15635 GMW3116 GMW3235 GMW14334 2.3 Additional References. TMC003 Material Safety Data Sheet guidance documents (available at ). 3 Requirements Materials approved to this specification shall meet the standard requirements of GMW3013. 3.1 Requirements on Delivery. Important physical, mechanical,
6、 and thermal properties that characterize the material are summarized in charts. 3.2 Requirements on Test Specimens. Reference GMW3221. Unless otherwise specified, injection molding of test specimens shall be accomplished per ISO 294 with the conditions for injection molding from ISO 9988-2. Unless
7、otherwise specified, test methods and specimen dimensions are to be in accordance with GMW3013. All tests shall be performed on unannealed specimens immediately following a conditioning period of 24 h minimum in a controlled atmosphere per GMW3221, Code A unless otherwise specified. In addition, tes
8、ts specified at temperatures below or above 23 C shall be conditioned at the specified temperature for 4 h minimum and tested at the specified temperature. Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted
9、without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW16924 Copyright 2013 General Motors Company All Rights Reserved February 2013 Page 2 of 5 3.2.1 Compound Properties (Natural, Black, and Integrally Colored). The following are also required for full standard approval. The minimum num
10、ber of lots per test required is one in natural: Stress Strain at multiple temperatures (for example -30 C, 23 C, and 85 C), Shear Modulus Curve, Differential Scanning Calorimeter Curve, and Infrared Spectroscopy Curve. See GMW3013 for the test procedures. 3.3 Chemical Requirements. All parts manufa
11、ctured from molding compounds shall be resistant to the media they contact, such as aliphatic and aromatic hydrocarbons, fuels, lubricants, oils, greases and alcohols, at their places of use. 3.4 Compound Properties. See Table 1. 3.5 Integrally Colored Properties Requirements. See Table 2. Table 1:
12、Compound Properties (Natural and Black) Property Standard Units C1 C2 C3 C4 Density ISO 1183, Method A, 10 mm x 10 mm x 4 mm g/cm3 1.41 0.03 1.41 0.03 1.41 0.03 1.41 0.03 Tensile Modulus ISO 527-1/2, Specimen ISO 3167, 4 mm thick Type A bar, Test speed 1 mm/minute; between 0.05 to 0.25% strain MPa 2
13、200 to 3100 2350 to 3250 2450 to 3350 2450 to 3350 Tensile Stress at Yield ISO 527-1/2, Specimen ISO 3167, 4 mm thick Type A bar, Test speed 50 mm/minute MPa 56 to 70 55 to 70 59 to 73 59 to 73 Poissons Ratio (one lot only) ISO 527-1/2 Specimen ISO 3167, 4 mm thick Type A bar, Tensile method, Test s
14、peed 1 mm/minute No units Report Notched Charpy Impact Strength at 22 C ISO 179/1eA, Specimen Machined V-notch, r = 0.25 mm, 80 mm x 10 mm x 4 mm kJ/m2 5 4 3 3 Notched Charpy Impact Strength at -30 C ISO 179/1eA, Specimen Machined V-notch, r = 0.25 mm, 80 mm x 10 mm x 4 mm kJ/m2 4 3 2 2 Melt Volume
15、Rate (MVR) 190C/2.16kg Or Melt Volume-Flow Rate (MFR) 190C/2.16kg ISO 1133 g/10 minute or cm3/10 minute 1 to 5 4 to 11 9 to 17 15 to 29 1.2 to 6.0 4.8 to 13.2 10.8 to 20.4 18 to 34.8 Mold Shrink - longitudinal - 48 h after Molding (one lot only) ISO 294-3/4, plaque size 60 mm x 60 mm x 2mm, Type D2
16、preferred or larger with maximum thickness 4 mm % Report Mold Shrink - transverse - 48 h after Molding (one lot only) ISO 294-3/4, plaque size 60 mm x 60 mm x 2 mm, Type D2 preferred or larger with maximum thickness 4 mm % Report Melting Temperature ISO 3146, Method A, Method B, Method C 10 K/minute
17、 C 160 to 172 Heat Deflection Temperature (HDT) 1.8 MPa ISO 75-1/2, Method A, Specimen 80 mm x 10 mm x 4 mm, test flatwise, unannealed C 80 80 80 80 Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without
18、 license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW16924 Copyright 2013 General Motors Company All Rights Reserved February 2013 Page 3 of 5 Property Standard Units C1 C2 C3 C4 Tensile Strength after Heat Aging 1000 h, 110 C (one lot only) ISO 527-1/2 Sample: 150 mm x10 mm x 4 mm thick, Typ
19、e A bar Test speed 50 mm/minute; if tensile strain at yield or break 10%, conditioning temperature defined by ISO 188 MPa Must be 75% retention of original values Notched Charpy Impact Strength at 22 C at Yield after Heat Aging 1000 h, 110 C (one lot only) ISO 179/1eA, Specimen Machined V-notch, r =
20、 0.25 mm, 80 mm x 10 mm x 4 mm conditioning temperature defined by ISO 188 % Must be 75% retention of original values Flammability (one lot only) GMW3232 or ISO 3795 report per requirements of GMW3232, Sample 355 mm 2 mm by 100 mm 2 mm 2 mm 0.2mm, thick mm/minute 100 Aldehydes and Ketones Emissions
21、(one lot only) GMW15635 g/g Formaldehyde Chemical Abstract Service (CAS) Number 50-00-0 5 Emissions (one lot only) GMW15634 g/g Volatile Organic Compounds (VOC) 50 Semi-volatile Organic Compounds (SVOC) 100 Fogging (one lot only) GMW3235-B-T2 condensable constituents mg 2, no droplets or crystals ar
22、e acceptable upon visual examination Chemical Resistance (one lot only) GMW14334-A No units Rating 1 Table 2: Compound Properties (Integrally) Property Standard Units C1 C2 C3 C4 Notched Charpy Impact Strength at 22 C ISO 179/1eA, Specimen Machined V-notch, r = 0.25 mm, 80 mm x 10 mm x 4 mm kJ/m2 4
23、3 2 2 Colorfastness to Light, Interior (Alternative) Colorfastness to Light, Interior GMW14162, Cycle D 601 kJ/m2 and 1240 kJ/m2 or GMW14162, Cycle C, 26 MJ/m2 E 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
24、objectionable tackiness, blotchiness, loss of grain, wrinkling, or other undesirable effects). Colorfastness to Light, Natural Weathering, Interior Weather Resistance per GMW3417-L1-F2-G1-T5. Test at the following intervals: 30 kl, 55 kl, 80 kl, 105 kl E 3.0 Visual evaluation overrides numerical sca
25、le approval. No objectionable defects allowed. Natural weathering performance shall take precedence over colorfastness to light testing. Flammability (one lot) GMW3232 or ISO 3795 report per requirements of GMW3232, Sample 355 mm 2 mm by 100 mm 2 mm, 2 mm 0.2 mm thick mm/minute 100 4 Manufacturing P
26、rocess Not applicable. 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 GMW16924 Copyright 2013 General Motors Company All Rights Reserved Fe
27、bruary 2013 Page 4 of 5 5 Rules and Regulations 5.1 Legal Regulations. All materials 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 p
28、recedence. 5.3 Inspection and Rejection. Samples of components or materials 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 sup
29、plies. A new approval must be received for any changes, e.g., properties, manufacturing 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 custom
30、er in a timely manner, without solicitation, and to include documentation of all modifications 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
31、 bulk supplies. In individual cases, a shorter test can be agreed to between the responsible Engineering 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 occurr
32、ed, 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 Labeling of Chemicals (GHS) requirements or other country-specific MSDS/SDS requirements. In addition, product MSDS/SDS submissions must b
33、e in compliance with specific country General Motors TMC003 Material Safety Data Sheet/Safety 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 Ma
34、terials supplied to this specification must be approved by General Motors. A list of approved 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 Mater
35、ial File reference for Production Part Approval Process (PPAP) material approval. If the decision is made to use a not yet approved material, contact GM Materials Engineering for details on the approval process. The material approval process must be completed prior to PPAP start date of the part sup
36、plied to General Motors. 7 Notes 7.1 Glossary. MATSPC: Global repository of GM approved materials for corresponding GM Engineering Standards. 7.2 Acronyms, Abbreviations, and Symbols. CAS Chemical Abstract Service GHS Globally Harmonized System of Classification and Labeling of Chemicals HDT Heat De
37、flection Temperature kl kilo Langley MFR Melt Volume Flow Rate MSDS Material Safety Data Sheet MVR Melt Volume Rate PPAP Production Part Approval Process SDS Safety Data Sheet SVOC Semi-volatile Organic Compound UV Ultraviolet VOC Volatile Organic Compound Copyright General Motors Company Provided b
38、y IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW16924 Copyright 2013 General Motors Company All Rights Reserved February 2013 Page 5 of 5 8 Coding System This standard shall be ref
39、erenced in other documents, drawings, etc., as follows: Material per GMW16924P-POM-C(number) Where: GMW = General Motors Worldwide 16924 = Sequential number of specification P = Plastic POM = Acetal C(number) = Type defined in Table 1 9 Release and Revisions This standard was originated in February
40、2013. It was first approved by the Plastic Global Subsystem Leadership Team in February 2013. It was first published in February 2013. Issue Publication Date Description (Organization) 1 FEB 2013 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-,-,-
