... to vacuum device, instrument ceramics, line insulation, switches of bands, outlets of electronic tubes, inductance coil skeleton, capacitor pillars, holders ... , fuse-tube ceramics and high-temperature materials of construction, etc.Properties of electric ceramic material: Properties ItemUnit and Symbol97 ... Electric Constant1MHz20ºC10~119~109~10≤9≤7.5Tangent Value of Medium Loss Angle1MHz20ºC~500ºC×10-4≤ ...