Non-hardening electrical putty, also known as duct seal compound or mastic, is the preferred material for sealing wire entries directly inside the box. This practice is a fundamental part of maintaining a structure's envelope. It prevents the uncontrolled movement of air, moisture, and. Outdoor power distribution box equipment operates in harsh year-round environments, prone to insulation aging, water ingress and short-circuit faults that jeopardize stable power supply. Superior insulation performance and professional sealing design are the core criteria for selecting qualified. ane foam is (DVR ) and that of silicone foam (DVR ). You can select different configuration and equipment option ur production, where they. The groove contours of electronic distribution boxes and the very narrow grooves of micro-distribution housings are seamlessly sealed with the sealing foams of the polyurethane-based FERMAPOR K31 or the silicone-based FERMASIL product families. The prerequisite for the exact application of sealing. Seal an electrical enclosure by matching the IP/NEMA rating, using the right gasket, cable glands, sealant, and inspection steps to block dust, water, and corrosion. Roxtec sealing solutions allow you to route and seal pre terminated cables without cutting connectors.