insulative

adj

1. Serving to insulate.

   “Housed resistors have their wire- wound cores embedded in an insulative material which is enclosed within the housing.”

   “The charge, that is applied and results in the measured voltage, may or may not pass through the insulative layer to the metallized film.”

   “And although charged insulated conductors do appear in many practical, industrial as well as everyday, situations, there is no doubt that charged insulative materials are far more common.”