R391 is a Plastic Weatherproof Sealing Compound, suitable to protect electrical connections from moisture and corrosive vapours. This has the consistency of putty and has good insulating properties. It can be moulded around terminals or connectors, or can be used as a mechanical seal for any form of enclosure. Prysmian weatherproof plastic compound prevents electrical leakage or short circuits due to dampness. It prevents corrosion of electrical contacts in industrial atmospheres and seals irregular openings, cable entries, screw threads and covers of electrical equipment. This compound can be also used for many non-electrical applications whenever a reliable non-hardening moisture or water seal is required. Prysmian Weatherproof Plastic Compound is soft enough to be readily moulded around terminals or intricate contours or pressed into cavities.