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GME GME8742 Document Information:
Title
Testing the Specific Volume Resistance of Elastomers, Plastics and Adhesives
Prüfung des spezifischen Durchgangswiderstandes von Elastomeren, Kunststoffen und Klebstoffen
General Motors Europe
Publication Date:
Jun 1, 2007
Scope:
If light metals (such as aluminium, magnesium) come into contact
with precious metals or solid bodies conducting electrons (e.g.
graphite), this may lead, in the presence of electrolytes, to the
preferential corrosion of the light metals.
To avoid this contact corrosion, elastomers, plastics and
adhesives shall have a sufficiently high insulation resistance. The
same applies if such materials are in contact with painted light
metal surfaces as the insulating paint layer may not offer
sufficient protection against contact corrosion, because of faults
or damages in the part.
The insulation resistance depends both on the specific volume
resistance and on the specific surface resistance of the test
piece.
The determination of the specific volume resistance is performed
to check the uniformity of the insulating material. The specific
volume resistance is considerably affected by temperature and
moisture.
Note: Nothing in the specification supersedes
applicable laws and regulations.
Note: In the event of a conflict between the
German and the English language, the German language shall take
precedence.
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