The Puncture Proof Long Rod Insulator is used for overhead transmission lines having distinct advantage over the conventional disc insulators from 60 kN to 420 kN. Modern Insulators Ltd. Manufactures Puncture Proof Long Rod Insulator. Modern Insulators Ltd. Is an ISO 9001:2000 and 14001:2004 registered company, that offers Textile and High Voltage Porcelain Insulators range of 33KV to 765 KV. The Long Rod Insulator is puncture proof and solid core. There is 31mm/kV Long Rod Insulator with 112 Kg/m3 salinity level to combat pollution in transmission system.