1、 WORLDWIDE ENGINEERING STANDARDS Material Specification GMW16874 PBT+PET - Glass Fiber/Mineral Reinforced Weatherable 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 Description. Thi
2、s specification covers the properties of injection moldable, weatherable 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. Typical applica
3、tions include windshield wiper airfoil. 2 References Note: Only the latest approved standards are applicable unless otherwise specified. 2.1 External Standards/Specifications. ASTM E831 ISO 527-1/2 ISO 4892-1/2 ISO 11469 ISO 75-2 ISO 1183 ISO 7792-2 SAE J1545 ISO 179/1eA ISO 3146 ISO 11357-3 SAE J19
4、76 ISO 294-1 ISO 3451 ISO 11359-2 SAE J2527 ISO 294-3/4 2.2 GM Standards/Specifications. GMW3013 GMW3059 GMW3221 2.3 Additional References. TMC003 Material Safety Data Sheet guidance documents (available at ). 3 Requirements Materials approved to this specification shall meet the requirements of GMW
5、3013, General Requirements for Handling of Technical Terms of Delivery for Plastics. 3.1 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 p
6、erformed on unannealed specimens in a controlled atmosphere 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. T
7、he 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. 3.2 Compound Properties (Natural, Black and Integrally Colored). See Table 1 and Table 2. The following are also required for full
8、 standard approval. The minimum number of lots per test 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. 3.3 Chemical Requirements. All p
9、arts manufactured from molding compounds shall be resistant 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 ENGIN
10、EERING STANDARDS GMW16874 Copyright 2012 General Motors Company All Rights Reserved December 2012 Page 2 of 4 Table 1: Compound Properties (Natural and Black) Property Standard Units Type ISO Symbol ISO 11469 PBT+PET-(MD10+GF20)PBT+PET-(MD10+GF20)PBT+PET-MD10+GF20 Copyright General Motors Company Pr
11、ovided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW16874 Copyright 2012 General Motors Company All Rights Reserved December 2012 Page 4 of 4 9 Release and Revisions This stand
12、ard was originated in October 2012. It was first approved by the Global Plastics 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 GMW16874 Material Codes Formerly Identified As GMW16874P-PBT+PET-MD10+GF20 GMP.PBT+PET.001 Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
