Patented manufacturing expertise for RODURFLEX® composite insulators

The first manufacturing stage is the continuous pultrusion process yielding the FRP rod. The combination of a hydrolysis resistant epoxy resin with acid resistant glass fibers (ECR glass) is a safe assurance against brittle fracture. Rods are cut to length and visually inspected before being coated with a seamless sheath of high-temperature vulcanized (HTV) silicone rubber ensuring optimum adhesion. Prefabricated sheds are mounted on to the rod to complete the insulator.

A subsequent vulcanizing stage creates a durable high-strength bond between the sheds and the rod sheath. The metal hardware is mounted by a cold-forming process and all insulators are subjected to mechanical inspection, after which the joints between the FRP rod and the metal components are sealed with a special silicone elastomer. This metastable compound creates a perfect seal which prevents the ingress of moisture for an unlimited period of time. A modular system comprising FRP rods of different diameters and any desired length up to 6 meters, various shed configurations (shapes, numbers, spacings) and a wide range of assorted end fittings allows the longrod insulator to be optimized for any specific application.


Optimized manufacturing expertise for SIMOTEC® composite insulators

Latest injection moulding technology is used for vulcanization of the silicone shed to the epoxy resin tube for insulators which can be up to 6 m long. Using a special primer on the tube permits chemical bonding with the shed, providing a durable connection under any condition. The point of connection between the tube and the metal end fitting is coated with silicone and is generally of a gas-tight design. The exact number of layers and wrapping angle for the tube is calculated to design the tubes for defined compression and bending loads. In this way LAPP INSULATORS can use tubes that are exposed to combined compressive and bending loads. As an option tubes with an inner liner made of polyester for protection against SF6-decay products can be provided.