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Electrical insulation
Silicone rubber has high insulation resistance of 1Tヘ?m?100Tヘ?m,and its insulating properties are stable over a wide range of temperatures and across a wide frequency spectrum. There is almost no decline in performance even when immersed in water, making silicone rubber an ideal insulating material. It hasparticularly good resistance to corona discharge and arcing at highvoltages. Silicone rubber is thus used extensively as an insulator in high voltage applications.
 
the volume resistivity of various rubbersCorrelation between temperature and the volume resistivity of various rubbers
 
Silicone rubber thickness and Dielectric breakdown volutage
(Temperature: 23∑C. Based on JIS K 6249)
 
Arc resistance Tracking resistance
material
ASTM method sec
Fabric based phenol resin
4.5
Chlorosulphonated polyethylene
5.2
Butyl rubber
72
High butyl rubber over
180
Chloroprene rubber
8.5
Epoxy resin
184
Polyester resin
134
Polytetrafluoroethylene (PTFE)
165-185
Silicone rubber over
180
material
ASTM method sec
Fabric based phenol resin
4.5
Chlorosulphonated polyethylene
5.2
Butyl rubber
72
High butyl rubber over
180
Chloroprene rubber
8.5
Epoxy resin
184
Polyester resin
134
Polytetrafluoroethylene (PTFE)
165-185
Silicone rubber over
180
  KA-3C Over 101 drops, less than 1 mm erosion
KA-2 Conduction path forms at 11-100 drops
Corona resistance
material
Operating life at 3kv h
pOlyethylene
24.0
Polytetrafluoroethylene(PTFE)
33.5
cetatecairt esolulle
36.5
Polytetrafluoroethylene (PET)
50.0
polyester vam ish
22.0
oilm odified phenolresin
55.0
Epoxy ester Vam ish
65.5
Asphalt vam ish
81.0
Silicone rubber
oVER 35,600