K-LINE INSULATORS Distribution Line Post Silicone Insulators

July 8, 2026

Insulator contamination is a common problem on overhead lines. The fundamental element for interruptions with contaminated insulators is moisture. Wet atmospheric conditions result in water filming on surfaces and causing leakage currents to develop. On wood structures, leakage currents can cause pole fires. On steel structures, leakage currents can develop into faults.

Silicone rubber formulations offer the ultimate solution in Line Post Insulator material. Due to its hydrophobicity, this material inherently resists water filming thereby limiting leakage currents. Silicone rubber insulators reduce leakage currents, even when contaminated and require less frequent washing. The savings in such maintenance costs are added benefits of using Silicone Rubber Insulators.

K-LINE INSULATORS LIMITED (KLI) silicone Distribution Line Post Insulators are manufactured and tested in accordance with industry wide standards, CSA C411.6, IEC 61952 and ANSI C29.18.

K-LINE INSULATORS LIMITED is registered to ISO 9001 Quality Systems.

Performance Benefits

The performance benefits of KLI Distribution Line Post Insulators are listed below.

• Improves Reliability (by mitigating interruptions and outages due to vandalism, pole fires, and
  flashovers in all types of environments)
• Eliminates or Reduces Maintenance (such as washing and trouble calls) and are compatible
  with existing installation
• Improves Power Quality (less RI and TVI)
• Energy Efficiency (Reduced losses due to lower leakage currents)
• Safety (light weight for handling and installation)
• Service Life (consistent performance over its service life)
• Life Cycle Cost (savings over ceramic insulators)

Application

Distribution Silicone Line Post Insulators are used on overhead distribution lines operating at and below 69 kV. These insulators are commonly installed on metal, concrete or wooden structures to horizontally or vertically support the line conductor. Also, these insulators can be used to support high voltage conductor jumpers or leads.

Core Rod

The core rod of the insulator is made of a high quality, epoxy resin, E-Glass fiberglass rod that has been specially formulated for electrical and mechanical applications.

Housing

The housing (includes sheath and sheds) of the insulator is one-piece, high temperature vulcanized, injection molded silicone rubber that is chemically bonded to the core rod. This ensures that the interface between the rubber and rod is impenetrable against moisture ingress. KLI uses its own proprietary silicone rubber formula in the manufacture of its insulators. The formulation has silicone rubber as the base polymer material with additives to enhance its performance in wet and contaminated environments.