insulator
substance that does not transmit certain forms of energy, such as heat (thermal insulator), sound (acoustic insulator) or electricity (electrical insulator)
microwave isolator
two-port device that transmits microwave or radio frequency power in one direction only
thermal insulation material
material having a low thermal conductivity
insulator
material whose internal electric charges do not flow freely, and which therefore does not conduct an electric current
building insulation material
insulation material