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IEC 61033 Ed. 1.0 b:1991
Test methods for the determination of bond strength of impregnating agents to an enamelled wire substrate
Describes three test methods to determine the bond strength of impregnating agents such as solvent-based varnishes and solventless resins. The three test methods most commonly used are: Twisted coil test, Helical coil test, Wire bundle test.
International Electrotechnical Commission [iec]