... exterprises of Eletricity ,steel,smelt,mechanism,colliery,mine,chemical,cement,oil field ,will choose the different products according to their special ... .4Thermal Shock ResistanceTc°C250200200Dielectricity constant1MHz.25°C 99.79.7Dielectric strength ac-kV/mm (ac V/mil)8.3 (210)8 ...