1、 WORLDWIDE ENGINEERING STANDARDS Material Specification GMW3086 Plastic Fuel Tank Copyright 2012 General Motors Company All Rights Reserved May 2012 Originating Department: North American Engineering Standards Page 1 of 9 1 Scope Note: Nothing in this standard supercedes applicable laws and regulati
2、ons. Note: In the event of conflict between the English and domestic language, the English language shall take precedence. This specification covers the material requirements for blow moldable plastic fuel tanks. Component testing and full vehicle system validation is still required. 1.1 Material De
3、scription. 1.1.1 Type 1. Coextruded Polyethylene based multilayer tank design for lower permeation. 1.1.2 Type 2. Monolayer Polyethylene based tank for general usage. 1.2 Symbols. Marking of plastic fuel tanks shall follow requirements in GMW14106 Specification for Integrated Fuel Tank Assembly. 1.3
4、 Typical Applications. Fuel tanks used for fuel storage in the recommended temperature limits of 90 C continuous and 110 C excursion. The excursion limit is for localized external hot spots which may result from exhaust routing, failed exhaust testing, etc. 1.4 Remarks. Not applicable. 2 References
5、Note: Only the latest approved standards are applicable unless otherwise specified. 2.1 External Standards/Specifications. ECE R34.01, Annex 5 ISO 1817 EEC 70/221 SAE J1681 2.2 GM Standards/Specifications. GMW16 GMW14850 GMW3059 GMW14853 GMW3221 GMW14860 GMW14106 GMW15449 GMW14800 GMW15450 GMW14846
6、GMW15800 GMW14847 GMW15801 GMW14848 GMW15802 GMW14849 GMW16787 2.3 Additional References. TMC003 Material Safety Data Sheet guidance documents (available at ). 3 Requirements 3.1 Requirements on Test Specimens. Testing should be performed in a controlled atmosphere per GMW3221, Code A, when applicab
7、le. 3.2 Constructions. The type of construction shall be defined on the part drawing and the following. Tank manufacturers must use material sources listed in the GM Materials File (i.e., MATSPC) for the materials making up their construction. Copyright General Motors Company Provided by IHS under l
8、icense with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW3086 Copyright 2012 General Motors Company All Rights Reserved May 2012 Page 2 of 9 3.2.1 Type 1. Six Layer Construction. Refer to Table 1 and Fi
9、gure A1 for Typical Coextrusion Layer Structure. Table 1: Typical Coextrusion Layer Structure Layer Material Specification 1 Virgin HDPE GMW16 Type 1 2 Adhesive - PE based GMW15802 3 EVOH barrier GMW15801 4 Adhesive - PE based GMW15802 5 Regrind from process only EVOH should be evenly distributed in
10、 regrind layer 6 Virgin HDPE with carbon black GMW16 Type 1 GMW15800 EVOH = Ethylene Vinyl Alcohol HDPE = High Density Polyethylene PE = Polyethylene 3.2.1.1 Dispersion of Regrind Layer. Ethylene Vinyl Alcohol (EVOH) should be evenly distributed in the regrind layer to avoid delamination. Refer to F
11、igure A2 and Figure A3 for examples of good and bad dispersions, respectively. Uniform distribution implies round particles and no evidence of elongated particles or platelets. 3.2.1.2 Pinch Area. The EVOH barrier layer should kiss (meet) below the pinch off area. A good pinch will provide higher im
12、pact strength. Refer to Figure A4 and Figure A5 for examples of bad and good pinch off, respectively. 3.2.2 Type 2: Monolayer Constructions. Monolayer tank wall will be made entirely of GMW16 Type 1 or Type 2. 3.2.2.1 Regrind. Any usage of regrind content shall be limited to the percentage that was
13、validated and submitted for Production Parts Approval Process (PPAP). The type of regrind must be of the same material that was validated and submitted for PPAP.The regrind must be clean, dry, and free of contamination. 3.3 Material Performance. Test frequency and sample size shall be agreed upon by
14、 the supplier and the GM Product Engineer. 3.3.1 -40 C Six Meter Drop Test (GMW14853) (Development and Quality Control). The drop test shall be conducted in accordance with GMW14853. Acceptance criteria shall be as defined on the engineering drawing. Testing to this section shall be done during deve
15、lopment and a specified frequency shall be agreed upon within the control plan. 3.3.2 Pressure Burst Test (GMW15449). The tank shell must meet a minimum of 345 kPa without bursting, splitting or leaking. 3.3.3 Internal Stress Crack Resistance Test. 3.3.3.1 Type 1. The tank shall be run in accordance
16、 with GMW16787 using fluid A for a minimum of 120 hours. There shall be no bursting, leaking, or evidence of stress cracking. 3.3.3.2 Type 2. The tank shall be run in accordance with GMW16787 using fluid B for a minimum of 80 hours. There shall be no bursting, leaking, or evidence of stress cracking
17、. 3.3.4 Wall Thickness. 3.3.4.1 The minimum wall thickness shall be 3.0 mm. If the minimum wall thickness occurs in an area of the weld: a. Measures shall be taken to ensure the wall integrity post weld. b. Studies shall be performed to ensure that during the weld process, the tank wall does not def
18、lect resulting in weld quality concerns. 3.3.4.2 Flash shall not exceed 3.0 mm in height from the normal surface. 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
19、ENGINEERING STANDARDS GMW3086 Copyright 2012 General Motors Company All Rights Reserved May 2012 Page 3 of 9 3.3.5 Barrier Thickness. (Type 1 Only). Barrier thickness testing applies to Type 1 only. Type 1 tanks must meet both the average and absolute minimum. 3.3.5.1 Average Minimum. The average mi
20、nimum thickness of the barrier layer is 3% of the total wall thickness and shall be 90 m. If an alternate barrier layer percentage is specified, then the average minimum thickness shall be calculated by the following formula: Thickness = Barrier percent/100% 3000 m Where: 3000 m is the minimum wall
21、thickness specified in 3.3.4. Example: For barrier layer intended to be 1.7% of wall: Thickness = 1.7%/100% 3000 m = 51 m 3.3.5.2 Average Minimum Procedure. Cut a band section from the tank shell perpendicular to the parasin through the flattest location. The band should be a minimum of 25 mm wide.
22、Divide the band into 25 mm+10 mm,-0 mm sections. Record the minimum thickness of the barrier layer through each divided section. 3.3.5.2.1 Absolute Minimum. The barrier layer shall be greater than 25 m throughout the entire tank. GM Engineering shall determine the highest stretch areas of the tank a
23、nd document them for ongoing quality control checks. 3.3.6 Peel Strength Test (Type 1 Tanks Only). Fill the tank to 40% of volume capacity with either CE10 per SAE J1681 or 10% Bioethanol in Gasoline according to ISO 1817 Liquid 1, and soak at 40 C for 20 weeks. Upon completion of soak, take peel st
24、rength samples from body side of tank. The test method for peel strength requires a 127 12.7 mm sample. Peel the coupon back approximately 18 to 26 mm to make a T. Place the piece in tensile test equipment and pull at a rate of 50 mm/minute. Ninety percent (90%) retention of the original non-soaked
25、value is required. 3.4 Part Performance. Non-material related part performance requirements shall be met as part of GMW14106. The part performance requirements include, but are not limited to: GMW14800 Fuel Tank Assembly: Cold Roll Test. GMW15450 Internal Cleanliness. 3.5 ECE/EEC Requirements. Tanks
26、 to be sold in Europe or regions that have adopted Economic Commission Europe/European Union (ECE/EEC) requirements in whole or part must meet the requirements as spelled out in ECE R34.01, Annex 5 and EEC 70/221. Further instructions can be found in GMW14106. The following lists GM procedures for a
27、ssistance in meeting those requirements. GMW14846: Fuel Permeability GMW14847: Impact Resistance GMW14848: Mechanical Strength GMW14849: Fire Resistance GMW14850: Resistance to High Temperature GMW14853: -40 C Meter Drop GMW14860: Fuel Tank Markings Export 3.6 List of Items Required on Engineering A
28、ssembly Drawings. Required notes on engineering drawing include, but are not limited to the following: Part weight. High stretch areas where thin walls could be encountered shall be identified on the drawing and absolute minimum barrier layer testing shall be performed in those areas. 4 Manufacturin
29、g 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 GMW3086 Copyright 2012 General Motors Company All Rights Reserved
30、May 2012 Page 4 of 9 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 language shall take prec
31、edence. 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 delivery of bulk suppli
32、es. 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 inform the customer
33、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 non-conforming bu
34、lk supplies. In individual cases, a shorter test 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 E
35、ngineering department(s) as meeting the requirements 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/Safe
36、ty 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 submissions must be in compliance with specific country General Motors TMC00
37、3 Material Safety Data Sheet/Safety Data Sheet 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 Not applicable 7 Notes 7.1 Glossary. MATSPC: Global reposito
38、ry of GM approved materials for corresponding GM Engineering Standards. 7.2 Acronyms, Abbreviations, and Symbols. ECE Economic Commission Europe EEC European Union EVOH Ethylene Vinyl Alcohol GHS Globally Harmonized System of Classification and Labeling of Chemicals HDPE High Density Polyethylene MS
39、DS Material Safety Data Sheet PE Polyethylene PPAP Production Parts Approval Process SDS Safety Data Sheet 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 ENGINEE
40、RING STANDARDS GMW3086 Copyright 2012 General Motors Company All Rights Reserved May 2012 Page 5 of 9 8 Coding System This standard shall be referenced in other documents, drawings, etc., as follows: Material per GMW3086 Type X Where: X is 1 for Multilayer and 2 for Monolayer. Alternate barrier laye
41、r thickness applications for Type 1 only shall be specified as follows: GMW3086 Type X (Barrier Y%) Where: Y is the alternate barrier layer thickness. 9 Release and Revisions This standard was originated in February 2000. It was first approved by the Global Plastics Team in October 2000. It was firs
42、t published in December 2000. Issue Publication Date Description (Organization) 1 DEC 2000 Initial publication. 2 SEP 2010 5 Year refresh of document - updated to current template. Added Alternate Type. (Plastics Subsystem Leadership Team) 3 MAY 2012 Updated Internal Stress Cracking Resistance Secti
43、on. (Plastics Global Subsystem Leadership Team) Cross Reference of Replaced Specifications Standard No. Replaced Specifications GMW3086 Type 1 GM7473M (GMNA) GMW3086 Type 2 GMI08010V (GME) Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo repr
44、oduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW3086 Copyright 2012 General Motors Company All Rights Reserved May 2012 Page 6 of 9 Appendix A Figure A1: Typical Coextrusion Layer Structure Copyright General Motors Company Provided by IHS under lic
45、ense with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW3086 Copyright 2012 General Motors Company All Rights Reserved May 2012 Page 7 of 9 Figure A2: Good Dispersion Figure A3: Bad Dispersion Copyright
46、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 GMW3086 Copyright 2012 General Motors Company All Rights Reserved May 2012 Page 8 of 9 Figure A4: Bad
47、Pinch Off 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 GMW3086 Copyright 2012 General Motors Company All Rights Reserved May 2012 Page 9 of 9 Figure A5: Good Pinch Off Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
