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1、 ENGINEERING STANDARDS Material Specification Plastics GMP.PP.126 Polypropylene (PP) 20% Calcium Carbonate, Heat Stabilized Homopolymer, ISO Tests 1 Scope This specification covers the properties of a 20% calcium carbonated filled, heat stabilized, injection molding grade polypropylene homopolymer.
2、1.1 Symbol. The material abbreviation according to ISO 11469 is: PP-KD20 1.2 Typical Applications. Typical applications include the following: electronic module housings. 2 References Note: Only the latest approved standards are applicable unless otherwise specified. 2.1 External Standard/Specificat
3、ions. ASTM D3012 ISO 1183 ISO 75 ISO 1873-2 ISO 178 ISO 3451-1 ISO 180/A ISO 11469 ISO 527-1/2 2.2 GM Standard/Specification. GM9032P GMW3059 GMW3001 GMW3221 3 Requirements 3.1 Requirements on Delivery. Important physical, mechanical and thermal properties that characterize the material are summariz
4、ed in charts. The color shall be specified on drawings, in material specifications and otherwise. Unless otherwise specified, injection molding of test specimens shall be accomplished per ISO 294 with the conditions for injection molding from ISO 1873-2. All test specimens shall be brought to equili
5、brium in standard conditions for temperature and moisture and tested in that state as defined in GMW3221 Code A, unless the test method indicates that standard conditioning is not required. Condition specimens for a minimum of 24 h prior to testing or until moisture equilibrium is reached. If specim
6、ens are tested outside the conditioned environment, 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 o
7、ther pigment and additive systems (e.g. stabilizer) are used, the impact values shall not decrease more than 10% from the specified minimum value. Copyright 2005 General Motors Corporation All Rights Reserved February 2005 Originating Department: North American Engineering Standards Page 1 of 2 Copy
8、right General Motors North America Provided by IHS under license with GM Licensee=IHS Employees/1111111001, User=Japan, IHS Not for Resale, 06/23/2008 19:41:18 MDTNo reproduction or networking permitted without license from IHS -,-,- GMP.PP.126 GM ENGINEERING STANDARDS Copyright 2005 General Motors
9、Corporation All Rights Reserved Page 2 of 2 February 2005 3.1.1 Compound Properties (Natural and Black). See table 1. Table 1: Compound Properties (Natural and Black) Property Value Standard Density 1.02 to 1.08 g/cm ISO 1183, Method A Filler 20 to 24% by mass ISO 3451-1, Method A Tensile Strength a
10、t Break 21 MPa min ISO 527-1/2, specimen A, test speed 5 mm/minute Flexural Modulus 1300 MPa min ISO 178, 80 x 10 x 4 mm specimen, test speed 2 mm/min, 64 mm span Notched Izod Impact at +23C 6.5 kJ/m min ISO 180/A, edgewise impact Deflection Temperature Under Load, 1.8 kPa 52C min ISO 75 (ref. SAE J
11、1686), flatwise Stress Mark Susceptibility 2.5 S.E.T. max GM9302P Thermal Oxidative Stability No visual degradation ASTM D3012, 150C for 336 hours 4 Manufacturing Process Not applicable. 5 Rules and Regulations 5.1 All materials supplied to this specification must comply with the requirements of GMW
12、3001, Rules and Regulations for Material Specifications. 5.2 All materials supplied to this specification must comply with the requirements of GMW3059, Restricted and Reportable Substances for Parts. 6 Approved Sources Engineering qualification of an approved source is required for this specificatio
13、n. Only sources listed in the GM Materials File (i.e. MATSPC) under this specification number have been qualified 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:
14、 GMP.PP.126 8 Release and Revisions 8.1 Release. This material specification originated in January 2005 and was approved by the PP Specialist in January 2005. It was first published in February 2005. 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 19:41:18 MDTNo reproduction or networking permitted without license from IHS -,-,-