1、 WORLDWIDE ENGINEERING STANDARDS Material Specification GMW16521 Poly-N-methylmethacrylimide Copyright 2011 General Motors Company All Rights Reserved July 2011 Originating Department: North American Engineering Standards Page 1 of 4 1 Scope 1.1 Material Description. This specification describes mat
2、erial types of a transparent or pigmented Poly-N-methylmethacrylimide (PMMI) which are used in injection molded components. Code letter and number, in addition to GMW3013 guidelines that apply to this specification, are listed in Table 1. Note: Additional characteristics will be indicated by code le
3、tters according to the respective specification number. Code letters that may apply to this specification are defined in GMW3013. 1.1.1 Paintability. Approved paint systems that can be used on this material are listed, for example, in the General Motors Approved Paint on Parts Systems (APOPS) databa
4、se. 1.1.2 Types. The classification into groups is according to the different properties as described in Tables 1 and 2. 1.2 Symbols. The material abbreviation according to ISO 11469 is PMMI 91 Haze % 1 Melt Volume Flow Rate (MVR) 260 C/10 kg ISO 1133 cm3/10 minutes 1.7 (260 C/10 kg) 5 (260 C/10 kg)
5、 13 (260 C/3.8 kg) Vicat Softening Temperature Heating Rate 50 C/h Load 50 N ISO 306 C 170 150 126 Heat Deflection Temperature (HDT) 0.45 MPa ISO 75-1, ISO 75-2 Annealed C 158 140 124 Heat Deflection Temperature (HDT) 1.8 MPa ISO 75-1, ISO 75-2 Annealed C 149 132 122 Heat Deflection Temperature (HDT
6、) 1.8 MPa ISO 75-1, ISO 75-2 Method A C Report Report Report Note 1: Standard test specimen and test setup should follow GMW3013. Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,
7、-,-GM WORLDWIDE ENGINEERING STANDARDS GMW16521 Copyright 2011 General Motors Company All Rights Reserved July 2011 Page 3 of 4 Table 2: Compound Properties (Natural/Crystal) (Information Only) Note 1 Property (Information Only) Standard Note 1 Unit Tolerance T1 T2 T3 Shrink, 48 h after molding Note
8、2 ISO 294-3, ISO 294-4 or ASTM D955 % 0.15 0.8 to 0.9 0.8 to 0.9 0.8 to 0.9 Coefficient of Linear Thermal Expansion (CLTE) - Flow Direction ISO 11359-2 10-6 mm/mm/C 5 Report Report Report Note 1: Standard test specimen and test setup should follow GMW3013. Note 2: Determined on test plaques and manu
9、factured at defined conditions. Not tooling specification data. Table 3: Properties Assigned to Type Property Type High Heat T1 Medium Heat T2 General Purpose T3 4 Manufacturing Process Not applicable. 5 Rules and Regulations 5.1 Legal Regulations. All materials must satisfy applicable laws, rules,
10、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 specification shall
11、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 manufacture,
12、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 process
13、es 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 department and th
14、e 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/Safety Data
15、 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 Labeling of Che
16、micals (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 to this s
17、tandard 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 (i.e., MATSPC) under this standard number have been q
18、ualified 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 Approved Paint on Parts Systems Copyright General Motors Company
19、Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW16521 Copyright 2011 General Motors Company All Rights Reserved July 2011 Page 4 of 4 CLTE Coefficient of Linear Thermal E
20、xpansion DSC Differential Scanning Calorimeter ECE Economic Commission for Europe FMVSS Federal Motor Vehicle Safety Standards GHS Globally Harmonized System HDT Heat Deflection Temperature MFR Melt Mass Flow Rate MSDS Material Safety Data Sheet MVR Melt Volume Flow Rate PMMA Polymethyl Methacrylate
21、 (Acrylic) PMMI Poly-N-methylmethacrylimide SDS Safety Data Sheet 8 Coding System This standard shall be referenced in other documents, drawings, etc., as follows: Material per GMW16521P-PMMI-Tx Where: GMW = General Motors Worldwide 16521 = Sequential number P = Plastics PMMI = Poly-N-methylmethacry
22、limide Tx = Type defined in Table 1 9 Release and Revisions This standard was originated in December 2010. It was first approved by the Global Plastics Team in July 2011. It was first published in July 2011. Issue Publication Date Description (Organization) 1 JUL 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-,-,-
