... resistance, chemical attack resistance, high dielectric strength , thermal shock resistance, wear resistance; Our ceramic sheaths and insulator tubes are made up of ... 's hardness: a) 9 b) 75) Flexural strength MPa:2006) Dielectric strength: 15KV/mm7) Dimensions: a) Outer diameter: 1.0 to ... ) Stable dimensions,e) Lightweight f) Long performance life; ceramic tube insulator