This test method provides a standardized procedure for evaluating the electrochemical resistance of automotive coolant hose and materials. electrochemical degradation has been determined to be a major cause of EPDM coolant system hose failures. The test method consists of a procedure which induces voltage to a test specimen while it is exposed to a water/coolant solution. Method No. 1, referred to as a Brabolyzer test, is a whole hose test. Method No. 2, referred to as a U tube test, uses cured plate samples or plates prepared from tube material removed from hose (Method No. 2 is intended as a screening test only). Any test parameters other than those specified in this SAE Recommended practice, are to be agreed to by the tester and the requester.