porcelain insulator 1)Anti-pollution suspension porcelain insulators 2)Material:porcelain porcelain insulator1)Anti-pollution suspension porcelain insulators2)Material:porcelain &Steel3)IEC standard4)Item no.:U70B,U70C,U100B,U160B,U160,U2105)Disc diameter:255,280,300mm avialable6)Leakage distance:400,450mm available porcelain insulator