GMW GMW16788-2012 PBT+PET Glass Fiber Reinforced Heat Stabilized Weatherable Issue 1 English.pdf

1、 WORLDWIDE ENGINEERING STANDARDS Material Specification GMW16788 PBT+PET Glass Fiber Reinforced, Heat Stabilized, Weatherable Copyright 2012 General Motors Company All Rights Reserved July 2012 Originating Department: North American Engineering Standards Page 1 of 5 1 Scope 1.1 Material Description.

2、 This specification covers the properties of glass fiber reinforced; heat stabilized, weatherable, polybutylene terephthalate/polyethylene terephthalate blend (PBT+PET). 1.2 Symbols. The material abbreviations according to ISO 11469 are listed in Table 1. 1.3 Typical Applications. Typical applicatio

3、ns include the following. Rear windshield wiper arm components. 1.4 Remarks. Not applicable. 2 References Note: Only the latest approved standards are applicable unless otherwise specified. 2.1 External Standards/Specifications. ASTM E831 ISO 4892-1/2 ASTM D6869 ISO 7792-2 ISO 75-2 ISO 11357 ISO 179

4、/1eA ISO 11359 ISO 188 ISO 11469 ISO 294-3/4 ISO 15512 ISO 527-1/2 SAE 1874-2 ISO 1183 SAE J1545 ISO 3146 SAE J1976 ISO 3451 SAE J2527 2.2 GM Standards/Specifications. GMW3013 GMW3221 GMW3059 GMW14335 2.3 Additional References. TMC003 Material Safety Data Sheet guidance documents (available at ). 3

5、Requirements Materials approved to this specification shall meet the 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 summariz

6、ed in Table 1 and Table 2. The color shall be specified on drawings, in material specifications and otherwise. 3.2 Requirements on Test Specimens. Unless otherwise specified, injection molding of test specimens shall be accomplished per ISO 294-3/4 with the conditions for injection molding from ISO

7、7792-2. 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 GMW16788 Copyright 2012 General Motors Company All Rights Reserved July 2012 Page 2

8、of 5 3.2.1 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 A or B, or GMW14335). Immediately after molding, specimens shall be sealed in moisture-proof containers and stored at 23 C 2 C

9、 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 controlled atmosphere per GMW3221, Code A, unless otherwise specified. In addition, tests specified at temperatures below or abov

10、e 23 C 2 C shall be conducted at the specified temperature using specimens conditioned at the specified temperature for 4 h minimum. 3.2.2 The values specified in Table 1 must be met by test specimens in natural, black, or in a standard sampled color if natural or black are not available. The values

11、 specified in Table 2 shall be met by a typical exterior color for approval to the specification and/or by test specimens in specific colors as required during color development. 3.3 Compound Properties (Natural, Black and Integrally Colored). See Tables 1 and 2. The following are also required for

12、full 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 3.4 Performance Requirements Al

13、l parts manufactured from molding compounds shall be resistant to the media they contact at their place of use. Table 1: Compound Properties (Natural and Black) Nominal Glass Fiber Reinforcement Property Standard Units 30% ISO Symbol ISO 11469 PBT+PET-GF30 Density ISO 1183 g/cm 1.55 0.03 Ash ISO 345

14、1 % mass 30 2 Tensile Modulus ISO 527 Mpa 8 500 Tensile Strength at Break ISO 527 Mpa 115 Notched Charpy Impact Strength At +23 C At -30 C ISO 179/1eA kJ/m2 5 4 Tensile Strength Retention after Heat Aging 1000 h at 85 C ISO 527 ISO 188 % Retention 75 Notched Charpy Impact Strength after Heat Aging 1

15、000h at 85 C ISO 179/1eA ISO 188 % Retention 75 Coefficient of Linear Thermal Expansion (for reference only) Parallel to Flow Perpendicular to Flow ASTM E831 or ISO 11359-2, TMA, Mean secant value over the temperature range -30 C to +160 C 10-6 mm/mm/ C Report Melting Temperature ISO 3146 or ISO 113

16、57-3 C Target Range 220 to 230 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 GMW16788 Copyright 2012 General Motors Company All Rights Res

17、erved July 2012 Page 3 of 5 Nominal Glass Fiber Reinforcement Property Standard Units 30% Heat Deflection Temperature Under Load, 1.8 MPa ISO 75-2 C 190 Mold Shrinkage (for information only) after 48 h at 23 C Parallel to Flow Perpendicular to Flow ISO 294-3/4 % 0.1 to 0.3 0.5 to 0.8 Table 2: Compou

18、nd Properties (Integrally Colored) Nominal Glass Fiber Reinforcement Property Standard Units 30% Notched Charpy Impact Strength At +23 C At -30 C ISO 179/1eA kJ/m2 5 4 Colorfastness to Light Exterior Color Change Color Change SAE J2527, 2500 kJ/m2 or ISO 4892-1/2, 3000 kJ/m2 SAE J1545 No objectionab

19、le defects allowed. E 3.0 Natural Weathering, Two years exposure in Arizona and Florida Color Change Note 1 SAE J1976, Procedure A SAE J1545 No objectionable defects allowed. E 3.0 Note 1: For integrally colored compounds, the color of each test specimen shall be measured per SAE J1545, CIELAB color

20、 space, 10 degree observer, illuminant D65, specular included, sphere geometry, before and after exposure. Prior to making measurements and observations on weathered specimens, wash specimens with a solution of 2 g No.7 Car Wash Concentrate (distributed by Armor All Products, Aliso Viejo, CA 92656)

21、and 1 L deionized water at 22 C 3 C. Use a soft sponge saturated with the solution and scrub the samples with a firm action. In case of conflict between accelerated weathering and natural weathering, natural weathering takes precedence. 4 Manufacturing Process Not applicable. 5 Rules and Regulations

22、 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 language shall take precedence. 5.3 Inspection and Rejection. Sample

23、s 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 delivery of bulk supplies. Copyright General Motors Company Provide

24、d by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW16788 Copyright 2012 General Motors Company All Rights Reserved July 2012 Page 4 of 5 A new approval must be received for any cha

25、nges, 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 inform the customer in a timely manner, without solicitation, and t

26、o 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 non-conforming bulk supplies. In individual cases, a shorter tes

27、t can be agreed to between the responsible Engineering department and the supplier. 5.4 Initial Source Approval. No shipments shall be made by any supplier until representative initial production samples have been approved by the appropriate Materials Engineering department(s) as meeting the require

28、ments of this specification. 5.5 Material Safety Data Sheets/Safety Data Sheets (MSDS/SDS). For new product submissions, or when a change in chemical composition of an existing product has occurred, a complete copy of the Material Safety Data Sheet/Safety Data Sheet must be submitted in compliance w

29、ith the Globally Harmonized System of Classification and Labeling of Chemicals (GHS) requirements or other country-specific MSDS/SDS requirements. In addition, product MSDS/SDS submissions must be in compliance with specific country General Motors TMC003 Material Safety Data Sheet/Safety Data Sheet

30、guidance documents where available. 5.6 All materials supplied to this standard must comply with the requirements of GMW3059, Restricted and Reportable Substances for Parts. 6 Approved Sources Engineering qualifications of an approved source are required for this standard. Only sources listed in the

31、 GM Materials File (i.e., MATSPC) under this standard number have been qualified by engineering as meeting the requirements of this standard. For other GM locations, the responsible Engineering group should be contacted to obtain the approved source in that individual country. 7 Notes 7.1 Glossary.

32、MATSPC: Global Repository of GM Approved Materials for corresponding GM Engineering Standards. 7.2 Acronyms, Abbreviations, and Symbols. CLTE Coefficient of Linear Thermal Expansion GF Glass Fiber GHS Globally Harmonized System of Classification and Labeling of Chemicals MSDS Material Safety Data Sh

33、eet PBT Polybutylene Terephthalate PET Polyethylene Terephthalate Blend SDS Safety Data Sheet TMA Thermomechanical Analysis 8 Coding System This standard shall be referenced in other documents, drawings, etc., as follows: Material per PBT+PET per GMW16788P-PBT+PET-GFYYZ Where: YY = Percentage of gla

34、ss filler Z = Additional codes from GMW3013 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 GMW16788 Copyright 2012 General Motors Company A

35、ll Rights Reserved July 2012 Page 5 of 5 9 Release and Revisions This standard was originated in March 2012. It was first approved by the Plastic Global Subsystem Leadership Team in July 2012. It was first published in July 2012. Issue Publication Date Description (Organization) 1 JUL 2012 Initial p

36、ublication. Cross-Reference of Replaced Material Coding GMW16788 Material Codes Formerly Identified As GMW16788P-PBT+PET-GF30 GMP.PBT+PET.006 Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-