... mechanical strength Special treatment can be made on request High strength of thread Fiberglass winding tube for power ... Transformer,Current Transformer,Hollow Insulators, Bushing, Surge Arrester, High-voltage Current Limiting Fuse, On-load tap changer,Power reactor ... Tension Strength 320MPa4 Insulation Resistance ≥5*104 Ω.M5Surface Flashover Voltage ≥12kV 5. Customers ABB,LAPP,MACLEAN,SIEMENS,TYCO, ...