Since the 1970s, Lovink Enertech has been producing high-quality polyurethane resins for low and medium voltage cable joints. These resins play a critical role in both mechanical protection and electrical insulation. But what makes polyurethane resin such a trusted material for cable jointing and why is it still going strong after decades?
Moisture resistance: Essential for cable joints
In regions like the Netherlands—often referred to as “Waterland” due to its saturated soil and high water tables—moisture ingress is one of the primary threats to underground cable infrastructure. Polyurethane resin is especially well-suited for these conditions because of its high hydrolysis resistance. It withstands prolonged exposure to groundwater without degrading or losing its insulating properties.
In addition, the resin bonds excellently to a wide range of materials, including synthetic sheaths, lead, and metal cable jackets. This ensures a tight, long-lasting seal that keeps moisture out.
Optimal flow and permanent protection of the MV joint
During casting, the viscosity is low. Viscosity is a term which is used to indicate the thickness of the resin. When the viscosity is low, the resin ‘flows’ effortlessly around all contours and in every cavity within the joint. The resin has a limited shrinkage after curing. As a result, all parts are permanently protected. All these features guarantee a reliable and long-lasting protection against moisture.
Armor against excavation damage
The good mechanical features such as the tensile strength, the hardness and the strength of impact ensure a solid protection. Together with the outer joint, the cured resin forms a solid armor. A medium voltage cable joint that is filled with polyurethane resin often remains undamaged after contact with an excavator.
Safe and sustainable processing
Today’s polyurethane resins come in two-compartment foil pouches, separating the resin and hardener until just before use. This packaging ensures that splicing technicians are not exposed to raw chemicals during mixing or application.
Even better, once cured, the resin is not classified as hazardous chemical waste. Any leftover material can be safely disposed of with standard industrial waste, making it a cleaner solution for both people and the environment.
What this means for distribution networks
Using polyurethane resin for cable splicing translates into fewer failures, longer service life, and increased grid reliability. Its unique combination of chemical resistance, mechanical strength, and ease of use makes it the ideal material for medium voltage cable joints.
