Visico™ LE4423/LE4437 is a silane crosslinkable natural compound system designed for insulation of low voltage energy cables. Visico™ LE4423 is a low density polyethylene, copolymerized with vinyl silane. Visico™ LE4437 is a crosslinking catalyst masterbatch specially designed to be used with Visico base resins. The system crosslinks quickly in sauna or in hot water. Cable insulation with a proper mixture of Visico LE4423 (95) parts) and Visico LE4437 (5 parts) exhibits excellent thermo-oxidative stability. The combination is suitable for both copper and aluminum conductors. Visico LE4437 contains a copper passivator, which minimizes discoloration (blackening) of the conductor.