Denso sealing mastic is perfect for service entries and ducts

Densoseal 16A sealing mastic is easy to apply.

For the most diverse portfolio of coatings, tapes, and other industrial products for infrastructure protection, the place to go is Denso North America. Among the company’s lineup is Densoseal 16A sealing mastic, a firm, fibrous mastic for service entries and ducts. Based on polybutene, mineral fillers, organic fibres, and water-displacing materials, this is a self-supporting, non-setting mastic in a preformed strip, developed for sealing cable ducts and conduits against ingress of water and gas.

Excellent moulding, sealing properties

Users can apply Densoseal 16A to wet surfaces, and it is unaffected by natural gas and water. It is especially ideal for sealing below ground level, to prevent water and gas from entering buildings. It is also useful for profiling mechanical joints on high-temperature pipes to enable tape application. This pale yellow mastic has excellent moulding and sealing properties, with no VOCs; it adheres to glazed earthenware, steel, and non-plasticized material like lead, polyethylene, or PVC.

Other features and benefits of this sealing mastic by Denso:

• accommodation of movement;
• ability to withstand at least 2.9 pounds per square inch of water pressure for more than half an hour;
• 100 per cent solids content;
• flash point above 150 degrees Celsius;
• temperature range from zero to 35 degrees Celsius for application, or -15 to 100 degrees Celsius for service; and
• suitability for underground ducts carrying telephone or electricity supply cables, and for ducts that terminate inside buildings, manholes, or chambers.

Before applying this sealing mastic, users should store the material for about 24 hours in a temperature between 21 and 41 degrees Celsius. The user begins by rotating each end in a twisting motion in opposite directions until it is mouldable, to make the process easier. Make sure surfaces are free from loose rust, scale, dirt, or previous sealants. The mastic is packed into the ends of the duct by hand and moulded firmly around cables and against the duct, while the user makes sure there are no gaps or fissures. Then pack the mastic to a depth that is equal or greater to the diameter of the duct.

For more information, contact Denso.

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