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Insulative material on wire and cables must be able to withstand exposure to moisture or humidity commonly encountered in aircraft operating environments. Excessive water absorption may lead to degradation of insulation, leakage currents, and electrical breakdown. The water absorption test evaluates an insulation material’s resistance to moisture ingress.
Moisture absorption is measured through the change in mass of the test specimen after immersion in deionized water. Environmental temperature and duration of immersion varies by test specification.