2hrs.
Description
Sika Boom 420 Fire is a fire rated expanding polyurethane foam for sealing service penetrations and linear joints where fire resistance is required. It expands to fill voids, providing effective fire, smoke, thermal, and acoustic sealing. The foam adheres to concrete, brick, metals, and timber, and can be cut, sanded, and painted once cured. Ideal for electrical and plumbing penetrations, cable trays, and perimeter gaps. For exterior exposure, the foam must be protected from UV by paint or coverings.
