1、 WORLDWIDE ENGINEERING STANDARDS Material Specification GMW3013 General Requirements for Handling of Technical Terms of Delivery for Plastics Copyright 2012 General Motors Company All Rights Reserved February 2012 Originating Department: North American Engineering Standards Page 1 of 24 1 Scope This
2、 specification includes Standard Requirements for GM Worldwide Material Specifications (numbered GMWXXXXX) that apply to plastics as well as some comments on requirements for plastic part performance. It also describes the Plastics Certification Statement which contains certified property data and o
3、ther information needed to write GMW specifications and/or approve molding compounds to GMW specifications. Note that only the minimum requirements for the approval of plastic materials are described herein. The part manufacturer or material processor reserves the right to specify more requirements
4、to satisfy their processing needs and quality systems. The main purpose of this structure of the Standard Requirements for Engineering Material Specifications is to provide designers, purchasers and suppliers with a selection of possible alternative materials for certain applications. The GMW specif
5、ications for plastics shall be preferred in drawings to local specifications (e.g., QK XXXXXX, GMP.XXX.XXX). 1.1 Material Description. 1.1.1 Material Identification. Additional characteristics, imparted by additives or special chemistry are indicated by code letters in this specification. While it i
6、s preferred to include these characteristics in the title of GMW Plastic Specifications, the code letters may be used as part of a specification call-out, if necessary. Such uses of code letter suffixes are to appear in alphabetical order (e.g., GMW19P-POM-H 1DZ) and are described further in 3.2.3.1
7、. 1.2 Symbols. For the marking and identification of vehicle components and materials, the following standards shall apply: ISO 1043-1 Plastics Symbols - Part 1: Basic polymers ISO 1043-2 Plastics Symbols - Part 2: Fillers and Reinforcing Materials ISO 11469 Plastics - Generic Identification and Mar
8、king of Plastic Products. For vehicle components and materials having a weight of more than 100 g, see also GMW3116. 1.3 Typical Applications. All plastic material supplied to GM and included in parts supplied to GM. 1.4 Remarks. In GMW plastics specifications, materials are described by the chemica
9、l, mechanical, physical and other properties of the granules or test specimens manufactured therefrom. Particular material types are combined in groups according to their chemical structure. These groups differ from each other by their main application, essential additives and characteristic propert
10、ies as well as type and content of filler (if applicable). 2 References Note: Only the latest approved standards are applicable unless otherwise specified. Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted
11、without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW3013 Copyright 2012 General Motors Company All Rights Reserved February 2012 Page 2 of 24 2.1 External Standards/Specifications. AATCC 23 ISO 75-2 ISO 1043-2 ISO 7792 ASTM D1003 ISO 105-A02 ISO 1133 ISO 8256 ASTM D1603 ISO 105-G02 IS
12、O 1157 ISO 8257 ASTM D1693 ISO 178 ISO 1183/A ISO 9002 ASTM D1894 ISO 179/1eA ISO 1431-1 ISO 9988 ASTM D3012 ISO 179/1eU ISO 1628 ISO 10350-1 ASTM D3763 ISO 188 ISO 1817 ISO 11357 ASTM D3769 ISO 294-3 ISO 1872 ISO 11357-2 ASTM E228 ISO 294-4 ISO 1873 ISO 11358 ASTM E831 ISO 306 ISO 1874 ISO 11359-2
13、EN 10204 ISO 307 ISO 2039-2 ISO 11469 FMVSS 108 ISO 458-1 ISO 2577 ISO 14910 FMVSS 302 ISO 489 ISO 2580 ISO 15512 IEC 296 ISO 527 ISO 3146 ISO/IEC 17025 IEC 60093 ISO 527-1 ISO 3167 ISO/TS 16949 IEC 60112 ISO 527-2 ISO 3451-1 SAE J1645 IEC 60243-1 ISO 812 ISO 3451-4 SAE J1681 IEC 60250 ISO 815-1 ISO
14、 3795 SAE J1976 ISO 34 ISO 815-2 ISO 4577 SAE J2527 ISO 34-1 ISO 868 ISO 4892-1 UL 94 ISO 37 ISO 899-1 ISO 4892-2 ISO 62 ISO 974 ISO 6603-1 ISO 75-1 ISO 1043-1 ISO 6603-2 2.2 GM Standards/Specifications. GM9302P GMW3232 GMW14335 GMW15571 GMW19 GMW3235 GMW14650 GMW15635 GMW3059 GMW3417 GMW14651 GMW15
15、725 GMW3116 GMW6992 GMW14688 GMW16172 GMW3205 GMW14162 GMW14698 GMW3221 GMW14334 GMW15468 2.3 Additional References. GP-10 TMC003 Material Safety Data Sheet guidance documents (available at ). 3 Requirements 3.1 Requirements on Test Specimens. Reference GMW3221. 3.2 Requirements on Delivery. General
16、 Requirements. Properties. The specified properties for Thermoplastics are primarily a selection from the properties of the Computer Aided Material Preselection by Uniform Standards (CAMPUS) material database (per ISO 10350-1 and the relevant part -2 of the International Organization for Standardiza
17、tion (ISO) material designation). Generic properties for Thermoplastic Elastomers (TPE) and Thermosets are also tabulated. Where suitable ISO/IEC test methods are not available, the appropriate national standard or GM test procedure is chosen. ISO material designations include but are not limited to
18、: 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 GMW3013 Copyright 2012 General Motors Company All Rights Reserved February 2012 Page 3 of
19、24 Table 1: ISO Material Designation Material ISO Material Designation ISO 1872 Polyethylene (PE) ISO 1873 Polypropylene (PP) ISO 1874 Polyamide (PA) ISO 2580 Acrylonitrile/Butadiene/Styrene (ABS) ISO 7792 Saturated Polyester ISO 8257 Poly(methyl) methacrylate (PMMA) ISO 9988 Polyoxymethylene (POM)
20、ISO 14910 Thermoplastic Polyether/Ester Elastomers Data Sheet. General Motors requires a Certification Template for plastic molding compounds being considered for approval to GMW series specifications. The Certification Template contains certified property data and other information needed to write
21、and approve molding compounds to GMW specifications. Certification Templates are available in GM SupplyPower or from a GM Automotive Group engineer. Templates by polymer family are currently available for most high volume resins. For cases where a Template is not available, suppliers should use Figu
22、re A1: Data Sheet 1 Certification Statement located in Appendix A to certify property values. For the properties listed in Figure A2 that are not only for initial approval, provide the number of lots tested, n, mean value and the standard deviation on the base compound using Figure A1: Data Sheet 1
23、Certification Statement located in Appendix A. Do not combine data from multiple colors unless it can be shown that combining the data does not significantly change the breadth of the data. Do not combine data from multiple processes. In general, properties should be reported as per existing specifi
24、cations and/or as negotiated with the materials engineer at the technology center of the regional GM Automotive Group. Test Atmosphere. For sampling of molding components or finished parts released to this specification, test specimens shall be conditioned for 24 h 2 h and tests shall be carried out
25、 on test specimens at the standard conditions specified in GMW3221 - Code A, unless otherwise specified. When sampling molding compounds, processability on production machines shall be noted. Requirements on Test Specimens. The mean and range values specified in the GMW specifications for plastics s
26、hall be established in cooperation with the raw material manufacturers, who shall document the properties of the plastic molding compounds in a Certification Statement for plastic molding compounds, per the appropriate Certification Package. Alternatively, when a Certification Package for the resin
27、is not available, use Appendix A. In any case, the GM Automotive Group materials engineer reserves the right to reject molding compounds with significant standard deviations. The minimum values or ranges specified in the GMW Plastic Specification property tables shall be met by test specimens in nat
28、ural, black or in a standard sampled color if natural or black are not available. For colored grades where other pigment or additive systems (e.g., stabilizer) are used, the impact values shall not decrease more than a given percentage from the specified minimum value, as indicated in the GMW materi
29、al specification. The raw material manufacturer shall test at least three properties of the molding compound regularly at each lot suitable to assure its production process. These tests should include a rheological (viscosity) property for unfilled thermoplastics and filler content test for filled t
30、hermoplastics. Also, as one of these three tests, if less than 30 lots of data are available on a given product, the raw material manufacturer shall verify and certify at least one of the specified mechanical properties in the inspection certificate of every delivery of molding compound to the proce
31、ssor. The test unit for the certificate shall be randomly obtained from that lot of the molding compound which is being delivered. A release can only be accomplished, if at inspection the actual values are within the specified range. The GM Automotive Group materials engineer reserves the right to n
32、arrow the specified range for parts with special requirements. Requirements on Parts. When sampling finished parts, the part supplier shall certify that the requirements of the part drawing are fulfilled (e.g., Color Fastness to Artificial Light, Resistance to Scratching). Copyright General Motors C
33、ompany Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW3013 Copyright 2012 General Motors Company All Rights Reserved February 2012 Page 4 of 24 At part delivery, the par
34、t supplier is obligated to forward a copy of the inspection certificate or Certificate of Analysis (e.g., in Europe, per EN 10204 3.1B) of the raw material manufacturer to the department in charge of the Production Part Approval Process (PPAP) review at GM Automotive Group. In this, the raw material
35、 manufacturer has to verify the properties to the processor. A release can only be accomplished, if at inspection the actual values are within the specified range. GM Automotive Group reserves the right to change material requirements for parts with special requirements. For current deliveries, the
36、part supplier shall verify the inspection certificate (in Europe, to EN 10204 3.1B) of the raw material manufacturer at the receiving inspection according to ISO 90024.10.2. According to ISO 90024.8, the part supplier shall ensure the traceability from his finished part lot number to the raw materia
37、l lot number and establish records about it according to ISO 90024.16. GM Automotive Group reserves the right to have a look into the records at any time, e.g., on the occasion of a supplier audit. The values determined on standard test specimens cannot be applied to the finished part; these values
38、could have changed during processing or because of tool structure and/or design of the finished part. Any deviation from the specification shall, however, not affect the function of the finished parts. For properties which deviate significantly from the specification due to processing, (e.g., melt f
39、low rate of thermoplastic polyester) limiting values should be determined on the finished part and specified on the drawing. In addition to the general drawing requirements like dimensional stability under heat, etc., these properties are used as the basis of comparison for following quality inspect
40、ions. The engineering drawing will show the material type as well as the respective GMW number. Also, the part supplier shall certify that the properties of the material specification that can be tested on the finished part are fulfilled. All plastic parts shall include GMW15571 as drawing/math data
41、 requirement. Plastic part performance properties are indicated on GM drawing/math data with the following specifications. Additional part performance properties may be indicated in addition on the GM drawing math data with the appropriate GM specification(s): Interior. All plastic parts located in
42、the vehicle interior must perform to GMW14651. Exterior. All plastic parts located in the vehicle exterior must perform to GMW14650. Underhood. All plastic parts located in the vehicle engine compartment must perform to GMW15725. 3.2.1 Chemical Requirements. All parts manufactured from molding compo
43、unds 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. 3.2.2 Testing Requirements. A subset of the properties listed in the subsequent tables should be used in individual GM Worldwide spec
44、ifications for Plastics per ISO 10350-1 and the relevant part 2 of the ISO material designation. 3.2.2.1 Testing Requirements for All Plastics. Table 2: Requirements for All Thermoplastics and Thermoplastic Elastomers Property Standard Specimen Type (Dimensions in mm) Unit Test Conditions and Supple
45、mentary Instructions Water absorption - saturation value in water at 22 C ISO 62 or GMW14335 1 mm, 2 mm or 4 mm plaque or pellets % Record dimensions of the specimen. Saturation value at +22 C 3 C/50% 5% Relative Humidity (RH) % Chemical resistance GMW14334 Copyright General Motors Company Provided
46、by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW3013 Copyright 2012 General Motors Company All Rights Reserved February 2012 Page 5 of 24 Property Standard Specimen Type (Dimensio
47、ns in mm) Unit Test Conditions and Supplementary Instructions Odor GMW3205 100 mm x 150 mm x 3.2 mm Ratio of test specimen to test container volume shall be 1:100. All materials: Code B Dry Condition Plastics containing materials with natural content (e.g., jute, sisal, hemp, flax, cellulose, wood,
48、cotton, etc.) Code A Wet Condition, and Code B Dry Condition Fogging - photometric (dependent on availability of equipment) GMW3235 % Reflectance Bath Temperature 85 C, 95 C or 105 C 0.5 C, Cooling Temperature 21 C 0.5 C, Test Duration 3 h 0.05 h. Choose bath temperature closest to Heat Deflection T
49、emperature (HDT). Fogging gravimetric (dependent on availability of equipment) GMW3235 mg Bath Temperature 100 C 0.5 C, Cooling Temperature 21 C 0.5 C, Test Duration 18 h 0.05 h. Density ISO 1183/A 10 mm x 10 mm x 4 mm g/cm3 Ash ISO 3451-1 Type A % by mass at +950 C, (+600 C for thermoplastic elastomers, +750 C 50 C for polypropylene) specify filler type exclusive of carbo
