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1、 ENGINEERING STANDARDS Material Specification Plastics GMP.PC.024 Polycarbonate High Heat, Copolymer, ISO Test Methods 1 Scope This specification covers the properties of a high heat, injection-molding grade of a polycarbonate copolymer. 1.1 Symbol. The material abbreviation according to ISO 11469 i
2、s PC-HT. 1.2 Typical Application. Typical applications include the following: Exterior Lighting Housings Bezels Reflectors Lenses 1.3 Paintability. Approved paint/coating systems that can be used on this material are listed in the GM Approved Paint on Parts Systems (GM APOPS) database. 2 References
3、Note: Only the latest approved standards are applicable unless otherwise specified. 2.1 External Standards/Specifications. ASTM D1003 ISO 1183 ASTM D3673 ISO 3451-1 FMVSS 108 ISO 7391-2 ISO 75-1/2 ISO 10350-4 ISO 178 ISO 11469 ISO 294 SAE J576 ISO 527 1/2 2.2 GM Standards/Specifications. GMW3001 GMW
4、3059 3 Requirements Important physical, mechanical and thermal properties that characterize the material are summarized in charts. The color shall be specified on drawings, in material specifications and otherwise. 3.1 Requirements on Delivery. Material supplier must certify molding compound propert
5、ies to the specific GM Test sampling Plan approved for their material. 3.2 Requirements on Test Specimens. Unless otherwise specified, injection molding of test specimens shall be accomplished per ISO 294 with the conditions for injection molding from ISO 7391-2. Also, unless otherwise specified, te
6、st methods and specimen dimensions are to be in accordance with ISO 10350-1. Test shall be conducted 40 hours minimum after molding and immediately following a conditioning period of 24 h minimum per GMW3221 Code A, unless otherwise specified. All tests shall be performed on unannealed specimens. In
7、 addition, tests specified at temperatures below or above 22 3 C shall be conducted at the specified temperature using specimens conditioned at the specified temperature for 4 h minimum. The minimum values specified in the property tables must be met by test specimens in natural, black, or in a stan
8、dard sampled color if natural or black are not available. 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. 3.1.1 Chemical Requirements. All parts manufactured from molding comp
9、ounds 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. Copyright 2004 General Motors Corporation All Rights Reserved December 2004 Originating Department: North American Engineering Stand
10、ards Page 1 of 3 Copyright General Motors North America Provided by IHS under license with GM Licensee=IHS Employees/1111111001, User=Japan, IHS Not for Resale, 06/23/2008 23:26:38 MDTNo reproduction or networking permitted without license from IHS -,-,- GMP.PC.024 GM ENGINEERING STANDARDS Copyright
11、 2004 General Motors Corporation All Rights Reserved Page 2 of 3 December 2004 3.1.2 Mechanical Requirements. See table 1. Table 1: Mechanical Requirements (Natural and Black) Mechanical Properties Standard Unit Values Flexural Modulus ISO 178, 80 x 10 x 4 mm specimen, 2 mm/min test speed, 64 mm sup
12、port span. MPa 2000 min Tensile Modulus ISO 527-1/2, specimen A, 50 mm/min test speed MPa 1850 min Tensile Strength ISO 527-1/2, specimen A, 50 mm/min test speed MPa 63 min Multiaxial Impact Strength at 23 2C ASTM D3763, specimen C, 2.2 m/s impact velocity J at max load 50 min Multiaxial Impact Stre
13、ngth at -30 2C ASTM D3763, specimen C, 2.2 m/s impact velocity J at max load 40 min 3.1.3 Physical Requirements. See Table 2. Table 2: Physical Requirements (Natural and Black) Physical Properties Standard Unit Values Density ISO 1183, Method A g/cm 1.12 to 1.23 Type I 130 min Type II 140 min Type I
14、II 150 min Type IV 160 min Heat Deflection Temperature, 1.8 MPa ISO 75-1/2, 80 x 10 x 4 mm specimen, flatwise C Type V 170 min 3.1.4 Additional Requirements. See table 3. Table 3: Additional Performance Properties (Lens Grade). Suffix L added to Type from table 2. Additional Performance Properties S
15、tandard Unit Value Luminous Transmittance ASTM D1003, Procedure B 84% Minimum Haze ASTM D1003, Procedure A 2% Maximum Weather Resistance SAE J 576 per FMVSS108 Section 5.1.2 Must comply 3.2 Performance Requirements. Performance Requirements e.g., flammability, fogging or resistance to odor shall be
16、specified on part drawings or in component specifications. 4 Manufacturing Process Not applicable. 5 Rules and Regulations 5.1 All materials supplied to this specification must comply with the requirements of GMW3001, Rules and Regulations for Material Specifications. Copyright General Motors North
17、America Provided by IHS under license with GM Licensee=IHS Employees/1111111001, User=Japan, IHS Not for Resale, 06/23/2008 23:26:38 MDTNo reproduction or networking permitted without license from IHS -,-,- GM ENGINEERING STANDARDS GMP.PC.024 5.2 All materials supplied to this specification must com
18、ply with the requirements of GMW3059, Restricted and Reportable Substances for Parts. 6 Approved Sources Engineering qualification of an approved source is required for this specification. Only sources listed in the GM Materials File (i.e., MATSPC) under this specification number have been qualified
19、 by engineering as meeting the requirements of this specification. 7 Coding System This material specification shall be referenced in other documents, drawings, VTS, CTS, etc. as follows: GMP.PC.024 TYPE TBD, POLYCARBONATE- HIGH HEAT, COPOLYMER, ISO TEST METHODS. Where: TBD equals a Roman numeral fr
20、om Table 2. For lens grades: GMP.PC.024 TYPE TBD-L, POLYCARBONATE-HIGH HEAT, COPOLYMER, ISO TEST METHODS, EXTERIOR LENS GRADE. Where: TBD equals a Roman numeral from Table 2. A higher numbered Type can be used in a lower numbered Type application. Example: A Type III can be used if Type II or I is s
21、pecified. 8 Release and Revisions 8.1 Release. This material specification originated in April 2004 and approved by Polycarbonate Specialist in December 2004. Copyright 2004 General Motors Corporation All Rights Reserved Page 3 of 3 December 2004 Copyright General Motors North America Provided by IHS under license with GM Licensee=IHS Employees/1111111001, User=Japan, IHS Not for Resale, 06/23/2008 23:26:38 MDTNo reproduction or networking permitted without license from IHS -,-,-