1、 WORLDWIDE ENGINEERING STANDARDS Material Specification GMW16873 PBT+PET - Glass Fiber/Mineral Reinforced Integrally Colored UV Stable Copyright 2012 General Motors Company All Rights Reserved December 2012 Originating Department: North American Engineering Standards Page 1 of 4 1 Scope 1.1 Material
2、 Description. This specification covers the properties of injection moldable, UV stable polybutylene terephthalate (PBT) and polyethylene terephthalate (PET) with glass and mineral filler. 1.2 Symbols. The material abbreviations according to ISO 11469 are shown in Table 1. 1.3 Typical Applications.
3、Typical applications include HVAC vanes. 2 References Note: Only the latest approved standards are applicable unless otherwise specified. 2.1 External Standards/Specifications. ASTM E831 ISO 294-1 ISO 1183 ISO 11357-3 ISO 75-2 ISO 294-3/4 ISO 3146 ISO 11359-2 ISO 179/1eA ISO 527 ISO 3451 ISO 11469 I
4、SO 179/1eU ISO 527-1/2 ISO 7792-2 2.2 GM Standards/Specifications. GMW3013 GMW3205 GMW3232 GMW3417 GMW3059 GMW3221 GMW3235 GMW14162 2.3 Additional References. TMC003 Material Safety Data Sheet guidance documents (available at ). 3 Requirements Materials approved to this specification shall meet the
5、requirements of GMW3013, General Requirements for Handling of Technical Terms of Delivery for Plastics. 3.1 Requirements on Delivery. Important physical, mechanical and thermal properties that characterize the material are summarized in Table 1. The color shall be specified on drawings, in material
6、specifications and otherwise. 3.2 Requirements on Test Specimens. Unless otherwise specified, injection molding of test specimens shall be accomplished per ISO 294-1 with the conditions for injection molding from ISO 7792-2. All tests shall be performed on unannealed specimens in a controlled atmosp
7、here per GMW3221, Code A, unless otherwise specified. In addition, tests specified at temperatures below or above 22 C 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 mus
8、t be met by test specimens in natural, black or in a standard sampled color if natural or black are not available. 3.3 Compound Properties (Natural, Black and Integrally Colored). See Table 1 and Table 2. The following are also required for full standard approval. The minimum number of lots per test
9、 required is one in natural: Poissons Ratio, Coefficient of Linear Thermal Expansion (CLTE), mold shrinkage, stress strain curve at multiple temperatures (-30 C, 23 C, +85 C). See GMW3013 for the test procedures. 3.4 Chemical Requirements. All parts manufactured from molding compounds shall be resis
10、tant to the media they contact at their place of use. 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 GMW16873 Copyright 2012 General Motors
11、 Company All Rights Reserved December 2012 Page 2 of 4 Table 1: Compound Properties (Natural and Black) Property Standard Units ISO Symbol ISO 11469 PBT+PET-(MD10+GF20)PBT+PET-(MD10+GF20)PBT+PET-MD10+GF20 9 Release and Revisions This standard was originated in October 2012. It was first approved by
12、the Plastics Global Subsystem Leadership Team in December 2012. It was first published in December 2012. Issue Publication Date Description (Organization) 1 DEC 2012 Initial publication. Cross-Reference of Replaced Material Coding GMW16873 Material Codes Formerly Identified As GMW16873P-PBT+PET-MD10+GF20 GMP.PBT+PET.004 Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
