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1、 ENGINEERING STANDARDS Material Specification Plastics GMP.PE.020 Polyethylene High Density, 30% Mica Filled, Blow Moldable, ASTM Tests 1 Scope This specification covers the properties of a high density, 30% mica filled, blow moldable polyeth- ylene. 1.1 Symbol. The material abbreviation accord- ing
2、 to ISO 11469 is PE-HD-PD30. 1.2 Typical Applications. Typical applications include the following: vapor vent valve. 2 References Note: Only the latest approved standards are applicable unless otherwise specified. 2.1 External Standards/Specifications. ASTM D256 ASTM D638 ASTM D648 ASTM D790 ASTM D7
3、92 ASTM D1897 ASTM D2584 ISO 11469 2.2 GM Standards/Specifications. GMW3001 GMW3059 GMW3221 3 Requirements 3.1 Requirements on Delivery. Important physical, mechanical and thermal properties that characterize the material are summarized in charts. The color shall be specified on drawings, in materia
4、l specifications and otherwise. Unless otherwise specified, injection molding of test specimens shall be accomplished per ASTM D1897. Test specimens shall be 3.2 0.2 mm thick unless otherwise specified. All test specimens shall be brought to equilib- rium in standard conditions for temperature and m
5、oisture and tested in that state as defined in GMW3221 Code A, unless the test method indi- cates that standard conditioning is not required. Condition specimens for a minimum of 24 h prior to testing or until moisture equilibrium is reached. If specimens are tested outside the conditioned environme
6、nt, they shall be tested within 10 minutes of removal. The minimum values specified in the property tables must be met by test specimens in natural, black, or in a standard sampled color if natural or black are not available. For colored grades where other pigment and additive systems (e.g. stabiliz
7、er) are used, the impact values shall not decrease more than 10% from the specified minimum value. Copyright 2003 General Motors Corporation All Rights Reserved October 2003 Originating Department: North American Engineering Standards Page 1 of 2 Copyright General Motors North America Provided by IH
8、S under license with GM Licensee=IHS Employees/1111111001, User=Japan, IHS Not for Resale, 06/23/2008 20:28:09 MDTNo reproduction or networking permitted without license from IHS -,-,- GMP.PE.020 GM ENGINEERING STANDARDS Copyright 2003 General Motors Corporation All Rights Reserved Page 2 of 2 Octob
9、er 2003 3.1.1 Compound Properties (Natural and Black). See Table 1. Table 1: Compound Properties (Natural and Black) Property Value Standard Specific Gravity 1.15 to 1.20 ASTM D792 Mineral Filler 27 to 33% by mass ASTM D2584 Tensile Strength at Yield 24 MPa min ASTM D638, Type I bar, 50 mm/minute El
10、ongation at Break 6% min ASTM D638, Type I bar, 50 mm/minute Flexural Modulus 1340 MPa min ASTM D790, Method I, 1.3 mm/minute, 50 mm span, tangent calculation, 3.2 mm bar thickness Notched Izod Impact at +23C 65 J/m min ASTM D256 Deflection Temperature Under Load, 1820 kPa 49C min ASTM D648 3.2 Perf
11、ormance Requirements. Performance requirements e.g., flammability, fogging or resis- tance to odor shall be 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
12、 requirements of GMW3001, Rules and Regulations for Mate- rial Specifications. 5.2 All materials supplied to this specification must comply with the requirements of GMW3059, Restricted and Reportable Sub- stances for Parts. 6 Approved Sources Engineering qualification of an approved source is requir
13、ed for this specification. Only sources listed in the GM Materials File (i.e. MATSPC) under this specification number have been quali- fied by engineering as meeting the requirements of this specification. 7 Coding System This material specification shall be referenced in other documents, drawings,
14、VTS, CTS, etc. as follows: GMP.PE.020 or GMN3405 8 Release and Revisions 8.1 Release. This material specification originated in Decem- ber 1999 and was approved by the PE Special- ist in August 2003. It was first published in Oc- tober 2003. 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 20:28:09 MDTNo reproduction or networking permitted without license from IHS -,-,-