1、 WORLDWIDE ENGINEERING STANDARDS Material Specification GMW16901 Polypropylene, Glass Fiber Fabric Reinforced, Compression Molded Copyright 2013 General Motors Company All Rights Reserved March 2013 Page 1 of 4 1 Scope 1.1 Material Description. This standard covers the properties of a glass fiber fa
2、bric, pre-impregnated with polypropylene, homopolymer, and used in a compression molding process. 1.2 Symbols. The material abbreviation according to ISO 11469 is PP GFXX . The symbol shall be completed by the supplier according to the Glass Fiber (GF) content of the material. 1.3 Typical Applicatio
3、ns. Typical applications include non-Class “A” surface appearance structural components such as the following; underbody panels, chassis shields, bumper beams. 1.4 Remarks. The classification into groups is according to the different ranges of glass fiber content. 2 References Note: Only the latest
4、approved standards are applicable unless otherwise specified. 2.1 External Standards/Specifications. ISO 75 ISO 1183 ISO 6603-1/2 ISO 11469 ISO 178 ISO 3451-1 ISO 11359-2 SAE J1686 ISO 527-1/2 2.2 GM Standards/Specifications. GMW3013 GMW3221 GMW14650 GMW15725 GMW3059 GMW14444 2.3 Additional Referenc
5、es. TMC003 Material Safety Data Sheet guidance documents (available at ). 3 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. The physical, mechani
6、cal and thermal properties that characterize the material are summarized in Table 1. Note: The requirements to Table 1 shall be documented for self-certification of the product according to GMW3013. The color shall be specified on drawings, in material specifications, and otherwise. 3.1.1 Requiremen
7、ts on Test Specimens. Unless otherwise specified, all specimens for test shall be obtained from molded plaques with a thickness of 2.5 mm 0.5 mm. The specimens shall be molded using temperatures and pressures typical of those used in production. All tests shall be performed on specimens for 40 h min
8、imum after molding and immediately following a conditioning period of 24 h minimum in a controlled atmosphere per GMW3221, Code A, unless otherwise specified. All tests shall be performed on unannealed specimens. Five coupons minimum shall be tested. The average value is the material property value.
9、 3.1.2 Chemical Requirements. All parts manufactured from molding compounds shall be resistant to the media they contact at their place of use. 3.2 Requirements on Materials. See Table 1. 3.3 Performance Requirements. All finished parts for Interior applications shall meet the requirements according
10、 to GMW14444. All finished parts for Exterior applications shall meet the requirements according to 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 ST
11、ANDARDS GMW16901 Copyright 2013 General Motors Company All Rights Reserved March 2013 Page 2 of 4 GMW14650. All finished parts for Engine Compartment applications shall meet the requirements according to GMW15725. 3.3.1 Limitations. Parts made of this material are subject to the following limitation
12、s. 3.3.1.1 Maximum continuous use temperature shall not exceed 125 C. 3.3.1.2 Maximum short term use, 30minutes, shall not exceed 145 C. 3.4 Compound Properties. The following are also required for full specification approval. The minimum number of lots per test required is one: Poissons Ratio, Stre
13、ss Strain Curve at +23 C, +85 C, -30 C; Differential Scanning Calorimetry (DSC) Curve; and Infrared Spectroscopy Curve. Table 1: Compound Properties Note 1, Note 2 Property Standard Unit Type 1 Type 2 Ash ISO 3451-1, Method A % by mass 40 3 60 3 Specific Gravity ISO 1183, Method A g/cm3 1.26 0.04 1.
14、45 0.05 Tensile Strength at Break ISO 527-1, ISO 527-2, Specimen A, Test Speed 5 mm/minute MPa 180 277 Tensile Elongation at Yield ISO 527-1/2 % 1.8 1.6 Tensile Modulus ISO 527-1/2 MPa 8000 9500 Flexural Modulus At 23 C At 80 C ISO 178, Method 1 MPa 7500 7000 9300 8500 Multiaxial Impact at +23 C, 2.
15、2 m/s ISO 6603-1/2 Energy at maximum load, Sample size 60 mm x 60 mm J 18 24 Multiaxial Impact at -30 C, 2.2 m/s ISO 6603-1/2 Energy at maximum load, Sample size 60 mm x 60 mm J 15 19 Tensile Strength after Heat Aging 1000 h at 100 C ISO 527-1, ISO 527-2, Specimen A, test speed 5 mm/minute % retenti
16、on 75 75 Deflection Temperature Under Load, 1800 kPa, Method A ISO 75 (refer to SAE J1686), flatwise C 155 155 Coefficient of Linear Thermal Expansion (CLTE) Parallel to flow Transverse to flow ISO 11359-2 Thermal Mechanical Analysis (TMA), Mean secant value over the temperature range -40 C to 85 C
17、mm/mm/C Report Report Note 1: Minimum requirements are listed unless otherwise stated. Note 2: Unless otherwise stated, requirements are for samples obtained from plaques irrespective of flow direction. Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for
18、 ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW16901 Copyright 2013 General Motors Company All Rights Reserved March 2013 Page 3 of 4 4 Manufacturing Process Not applicable. 5 Rules and Regulations 5.1 Legal Regulations. All material
19、s 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. Samples of components or materials release
20、d 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. A new approval must be received for any changes, e.g., properties, manufactu
21、ring 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 to include documentation of all mo
22、difications 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 test can be agreed to between the re
23、sponsible 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 product has occurred, a complete copy of the Material Safety Data Sheet/Safety Data Sheet must be sub
24、mitted 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 submissions must be in compliance with specific country General Motors TMC003 Material Safety Data Sh
25、eet/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 Approved Sources Materials supplied to this specification must be approved by General Motors. A list o
26、f 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 can use GM Material File reference for Production Part Approval Process (PPAP) material approval. I
27、f the decision is made to use a not yet approved material, contact Materials Engineering for details on the approval process. The material approval process must be completed prior to PPAP start date of the part supplied to General Motors. 7 Notes 7.1 Glossary. MATSPC: Global repository of GM approve
28、d materials for corresponding GM Engineering Standards. 7.2 Acronyms, Abbreviations, and Symbols. CLTE Coefficient of Linear Thermal Expansion DSC Differential Scanning Calorimetry GF Glass Fiber GHS Globally Harmonized System of Classification and Labeling of Chemicals MSDS Material Safety Data She
29、et PPAP Production Part Approval Process SDS Safety Data Sheet TMA Thermal Mechanical Analysis 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 STANDAR
30、DS GMW16901 Copyright 2013 General Motors Company All Rights Reserved March 2013 Page 4 of 4 8 Coding System This standard shall be referenced in other documents, drawings, etc., as follows: Material per GMW16901P PP GFXX, where XX denotes the nominal glass fiber weight percentage 9 Release and Revi
31、sions This standard was originated in December 2012. It was first approved by the Composites Global Subsystem Leadership Team in March 2013. It was first published in March 2013. Issue Publication Date Description (Organization) 1 MAR 2013 Initial publication. Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
