Nonconductor

n.

1.

(Physics) A substance which does not conduct, that is, convey or transmit, heat, electricity, sound, vibration, or the like, or which transmits them with difficulty; an insulator; as, wool is a nonconductor of heat; glass and dry wood are nonconductors of electricity.

Noun

1.

nonconductor - a material such as glass or porcelain with negligible electrical or thermal conductivity Synonyms: dielectric, insulator

bushing, dielectric, glass wool, insulator, material, mineral wool, rock wool, stuff