1、 WORLDWIDE ENGINEERING STANDARDS Material Specification GMW16748 PBT Glass Fiber Reinforced, UV Stabilized, Heat Stabilized Copyright 2013 General Motors Company All Rights Reserved January 2013 Page 1 of 5 1 Scope Note: Nothing in this standard supercedes applicable laws and regulations. Note: In t
2、he event of conflict between the English and domestic language, the English language shall take precedence. 1.1 Material Description. This specification covers the properties of injection-moldable, ultraviolet (UV) stabilized-heat-stabilized, glass-reinforced polybutylene terephthalate (PBT). 1.2 Sy
3、mbols. The material abbreviations according to ISO 11469 are shown in Table 1 and Table 2. 1.3 Typical Applications. Typical applications include secondary HVAC vanes. 1.4 Remarks. Not applicable. 2 References Note: Only the latest approved standards are applicable unless otherwise specified. 2.1 Ex
4、ternal Standards/Specifications. ASTM D6869 ISO 294-1 ISO 1874-2 ISO 11359-2 ASTM E831 ISO 294-3/4 ISO 3146 ISO 11469 ISO 75 ISO 527 ISO 3451 ISO 15512 ISO 179/1eA ISO 527-1/2 ISO 7792-2 ISO 188 ISO 1183 ISO 11357-3 2.2 GM Standards/Specifications. GMW3013 GMW3221 GMW3417 GMW3059 GMW3232 GMW14162 GM
5、W3205 GMW3235 GMW14335 2.3 Additional References. TMC003 Material Safety Data Sheet guidance documents (available at https:/). 3 Requirements Materials approved to this specification shall meet the requirements of GMW3013. 3.1 Requirements on Test Specimens. Reference GMW3221. Unless otherwise speci
6、fied, injection molding of test specimens shall be accomplished per ISO 294-1 with the conditions for injection molding from ISO 7792-2. All values indicated herein are based on material considered to be in the dry-as-molded state with moisture content of 0.02% maximum (ASTM D6869, ISO 15512 Method
7、A or B, or GMW14335). Immediately after molding, specimens shall be sealed in moisture-proof containers and stored at 23 C 2 C for at least 24 h prior to test as specified in ISO 1874-2. All tests shall be performed on unannealed specimens immediately after their removal from the containers in a con
8、trolled atmosphere per GMW3221 Code A, unless otherwise specified. In addition, tests specified at temperatures below or above 23 C 2 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 proper
9、ty tables must be met by test specimens in natural, black, or in a standard sampled color if natural or black are not available. Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-
10、,-GM WORLDWIDE ENGINEERING STANDARDS GMW16748 Copyright 2013 General Motors Company All Rights Reserved January 2013 Page 2 of 5 3.2 Requirements on Delivery. Important physical, mechanical and thermal properties that characterize the material are summarized in Table 1. The color shall be specified
11、on drawings, in material specifications and otherwise. 3.3 Compound Properties (Natural and Black). See Table 1. The following are also required for full standard approval. The minimum number of lots per test required is one in natural. Poissons Ratio Coefficient of Linear Thermal Expansion (CLTE) M
12、old 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 resistant to the media they contact at their place of use. Table 1: Compound Properties (Natural and
13、Black) Nominal Glass Fiber Reinforcement Property Standard Units 10% 15% 30% ISO Symbol ISO 11469 Not Applicable PBT-GF10PBT-GF15PBT-GF30 2.5 2 4 3 5 4 Tensile Strength at Break After 1000 h at 140 C ISO 527-1/2 ISO 188 % Retention 75 Notched Charpy Impact Strength after 1000 h at 140 C ISO 179/1eA
14、ISO 188 % Retention 75 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 GMW16748 Copyright 2013 General Motors Company All Rights Reserved Ja
15、nuary 2013 Page 3 of 5 Nominal Glass Fiber Reinforcement Property Standard Units 10% 15% 30% Melting Temperature ISO 3146 or ISO 11357-3 C 215 Heat Deflection Temperature Under Load 1.8 MPa ISO 75 C 165 170 185 Coefficient of Linear Thermal Expansion (for reference only) Parallel to Flow Perpendicul
16、ar to Flow ASTM E831 or ISO 11359-2, TMA, Mean Secant Value Over the Temperature Range -30 C to +160 C 10 to 6 mm/mm/C Report Mold Shrinkage After 48 hr 23 C (For Information Only) Parallel to Flow Perpendicular to Flow ISO 294-3/4 % 0.7 to 0.9 1.1 to 1.3 0.60 to 0.70 1.0 to 1.2 0.3 to 0.5 0.7 to 0.
17、9 Flammability GMW3232 mm/minute 100 Odor GMW3205 Code B, Specimen 100 mm x 150 mm x 3.2 mm N/A 6 Fogging GMW3235-B-Y2-T2 mg 2.0 Table 2: Compound Properties (Integrally Colored) Nominal Glass Fiber Reinforcement Property Standard Units 10% 15% 30% Xenon GMW14162/D/601.6 kJ/m N/A E 3.0. No objection
18、able defects allowed. Alternative Xenon GMW14162/C/26 MJ/m N/A Flammability GMW3232 mm/minute 100 Notched Charpy Impact Strength At +23 C At -30 C ISO 179/1eA kJ/m2 2 2 4 3 5 4 Natural Weathering GMW3417 L1-F2-G1-T4 15 kL, 30 kL, 55 kL E 3.0. No objectionable defects allowed. N/A = Not applicable. 4
19、 Manufacturing Process Not applicable. 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 GMW16748 Copyright 2013 General Motors Company All Ri
20、ghts Reserved January 2013 Page 4 of 5 5 Rules and Regulations 5.1 Legal Regulations. All materials must satisfy applicable laws, rules, regulations and recommendations valid in the country of usage. 5.2 Language. In the event of conflict between the English and domestic language, the English langua
21、ge shall take precedence. 5.3 Inspection and Rejection. Samples of components or materials released to a GM material specification shall be tested for conformity with the requirements of this material specification and approved by the responsible Engineering department prior to commencement of deliv
22、ery of bulk supplies. A new approval must be received for any changes, e.g., properties, manufacturing process, location of manufacture, etc. If not otherwise agreed, all testing and documentation normally required for initial release must be completed. It is the responsibility of the supplier to in
23、form the customer in a timely manner, without solicitation, and to include documentation of all modifications of materials and/or processes and to apply for a new release. If not otherwise agreed, all release tests shall be repeated and documented by the supplier prior to commencement of delivery of
24、 non-conforming bulk supplies. In individual cases, a shorter test can be agreed to between the responsible Engineering department and the supplier. 5.4 Material Safety Data Sheets/Safety Data Sheets (MSDS/SDS). For new product submissions, or when a change in chemical composition of an existing pro
25、duct has occurred, a complete copy of the Material Safety Data Sheet/Safety Data Sheet must be submitted in compliance with the Globally Harmonized System of Classification and Labeling of Chemicals (GHS) requirements or other country-specific MSDS/SDS requirements. In addition, product MSDS/SDS sub
26、missions must be in compliance with specific country General Motors TMC003 Material Safety Data Sheet/Safety Data Sheet guidance documents where available. 5.5 All materials supplied to this standard must comply with the requirements of GMW3059, Restricted and Reportable Substances for Parts. 6 Appr
27、oved Sources Materials supplied to this specification must be approved by General Motors. A list of approved materials can be found in MATSPC. This GM Material File is provided to third parties to reduce redundant testing of materials. If approved material already listed is used, the part supplier c
28、an use GM Material File reference for Production Part Approval Process (PPAP) material approval. If the decision is made to use a not yet approved material, contact the Plastics Global Subsystem Leadership Team for detail on the approval process. The material approval process must be completed prior
29、 to PPAP start date of the part supplied to General Motors. 7 Notes 7.1 Glossary. MATSPC: Global repository of GM approved materials for corresponding GM Engineering Standards. 7.2 Acronyms, Abbreviations, and Symbols. ASTM ASTM International CLTE Coefficient of Linear Thermal Expansion GF Glass Fib
30、er GHS Globally Harmonized System of Classification and Labeling of Chemicals MSDS Material Safety Data Sheet PBT Polybutylene Terephthalate PPAP Production Part Approval Process SDS Safety Data Sheet TMA Thermomechanical Analysis UV Ultraviolet Copyright General Motors Company Provided by IHS under
31、 license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW16748 Copyright 2013 General Motors Company All Rights Reserved January 2013 Page 5 of 5 8 Coding System This standard shall be referenced in o
32、ther documents, drawings, etc., as follows: Glass Filled UV Stable Polybutylene Terephthalate per GMW16748P-PBT-GFYYZ Where: YY = Percentage of glass filler For Example: GMW16748P-PBT-GF30 is a UV-stable polybutylene terephthalate with 30% glass fiber reinforcement. 9 Release and Revisions This stan
33、dard was originated in December 2011. It was first approved by the Plastics Global Subsystem Leadership Team (GSSLT) in April 2012. It was first published in May 2012. Issue Publication Date Description (Organization) 1 MAY 2012 Initial publication. 2 JAN 2013 Added 10% glass filled grade. (Plastics
34、 Global Subsystem Leadership Team) Cross-Reference of Replaced Material Coding GMW16748 Material Codes Formerly Identified As GMW16748P-PBT-GF30 GMP.PBT.036 Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
