哪些材料是絕緣體？

絕緣體是有，不過沒有絕對絕緣，也會有被擊穿的時候。

A.B.S. ACETATE:ACRYLIC: BERYLLIUM OXIDE:CERAMIC:DELRIN: EPOXY/FIBERGLASS:GLASS:KAPTON:KYNAR:LEXAN and MERLON:MELAMINE:MICA:NEOPRENE: NOMEX: NYLON:P.E.T.:P.E.T.G.: PHENOLICS:POLYESTER (MYLAR): POLYOLEFINS: POLYSTYRENE: POLYURETHANE: PVC: Polyvinylcloride : SILICONE/FIBERGLASS: SILICONE RUBBER: TFE (TEFLON):THERMOPLASTICS: INSULATING PAPERS;