Plastics - There are many plastic insulation methods, most of which use the commonly found polyvinyl chloride (PVC). Wires insulated with PVC can withstand acids, solvents, gas and ozone.
Fluoropolymers - Fluoropolymers are characterized by their high resistance to solvents, acids and bases. They are often used in cars and planes because of their unbeatable chemical and temperature resistance.
Rubbers - Rubber is a great choice for electrical insulation as it does exactly what the goal of insulation is — keep electricity confined in the material.