【最新版】 GMW 14333-2009汽车外部材料和零件耐燃油性测试.pdf
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WORLDWIDE
ENGINEERING
STANDARDS
Test Procedure
Materials
GMW14333
Resistance to Fuels of Exteriors Automotive Materials and
Components
© Copyright 2009 General Motors Corporation All Rights Reserved
May 2009
Originating Department: North American Engineering Standards
Page 1 of 4
1 Scope
Note: Nothing in this standard supersedes
applicable laws and regulations.
Note: In the event of conflict between the English
and domestic language, the English language shall
take precedence.
1.1 Purpose. The objective of this standard is to
determine the effects of fuels on exterior
automotive materials and components.
1.1.1 Summary of Test Procedure. Using this
method, resistance of sample parts to automotive
fuels is determined by evaluation after repeated
short immersions.
1.2 Foreword. Not applicable.
1.3 Applicability. Not applicable.
2 References
Note: Only the latest approved standards are
applicable unless otherwise specified.
2.1 External Standards/Specifications.
ASTM D1744
ISO 1817
DIN-51777-1
ISO-10336
2.2 GM Standards/Specifications.
EDS-T-7014
GMW3221
GM9507
3 Resources
3.1 Facilities. Not applicable.
3.2 Equipment.
3.2.1 Apparatus for conditioning according to
GMW3221.
3.2.2 Stop watch with 0.1 s divisions.
3.2.3 Suitable glass beakers to allow immersion of
sample.
3.2.4 Sharp knife.
3.2.5 Test fuel composition as follows:
ISO 1817 Liquid 2 with additional 20 ppm
formic acid.
25.35% 2.2.4-trimethylpentane
(analytical grade).
42.25% toluene (analytical grade).
12.68% di-isobutylene (analytical grade).
4.22% ethanol (analytical grade).
15.00% methanol (analytical grade).
0.50% water.
20 ppm formic acid (analytical grade).
These are known alternatively as EDS-T-7014.
3.2.5.1 This fuel composition must be used for all
technology approvals. Additional applications of
this specification must be agreed upon by the
responsible engineer. (i.e., local Production Part
Approval Process (PPAP) testing or problem
solving, etc.)
3.2.6 Preparation of Fuel Test Fluid (Gasoline).
3.2.6.1 Mixture A. In a first step, the components
trimethylpentane, toluene and/or di-isobutylene
have to be mixed in a way that the final
composition of the fluid corresponds to the
composition as given in 3.2.5.
3.2.6.2 Water Content. Since the final fuel test
fluid contains a specified amount of water, the
primary water content of mixture A shall be
determined using the Karl Fischer Titration method
(ISO 10336, ASTM D1744 or DIN 51777-1).
3.2.6.3 Mixture B. The volume parts of methanol
and/or ethanol respectively shall be added to
mixture A with the appropriate volume parts of test
fluid blend to give a composition approximating to
that specified in 3.2.5.
3.2.6.4 Water Content (if applicable). The water
content of mixture B shall be determined using the
Karl Fischer Titration. Afterwards, distilled or
deionised water shall be added to attain the
required concentration.
3.2.6.5 Mixture C (Additives). Lastly, the acid
(dissolved in absolute ethanol) or corrosive content
shall be added to reach the final fuel test fluid
(mixture C).
3.2.6.6 Water Content (if Applicable). Water
content of mixture C shall again be determined to
ensure compliance per 3.2.5. The test fluid shall be
stored in a sealed brown or opaque glass bottle or
suitable metal container.
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