Hollow insulators are used in outdoor high-voltage apparatus such as Power Transformer, Switchgear, Current Transformer, Potential Transformer, Capacity Voltage Transformer(CVT) Surge Arrester and etc. Those are used in different entironment from -40a?? to the maximum temperature specified and by relevant standard. Normal type, anti-pollutia type, plain type and plateau type are available for different applications. and also are suitable for operation at an altitude up to 1, 000 metres, plateau type porcelain shells are suitable for operation at an altitude up to 3, 500 metres. The voltage ranges could be from 35kV up to 1000kV. The products could be made as per IEC, ANSI, BS, AS, DIN, JIS, and Chinese Standard(GB). And could be produced as per clients' requirment.