M00001386
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GMW14679 3rd Edition, July 1, 2014 Test of Electrochemical Resistance of Elastomeric Compounds
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Availability date: 07/27/2021
Description / Abstract:
Introduction
Note: Nothing in this standard supercedes
applicable laws and regulations.
Note: In the event of conflict between the
English and domestic language, the English language shall take
precedence.
Purpose. This test procedure determines the
electrochemical resistance of elastomeric compounds used for
coolant hoses.
Applicability. This test procedure is
applicable to all coolant hoses.
Remarks. The electrochemical degradation of
coolant hose materials is caused by a galvanic reaction between the
metal fitting and the carbon black in the rubber. This causes
cracks in the Ethylene Propylene Diene Terpolymer (EPDM) elastomer,
which are not formed by thermal ageing. They require a low
electrical potential. This test procedure is to simulate these
conditions to test the resistance of a compound to electrochemical
degradation.