Nelson FSP Putty creates instant fire seal around pipes, cables and duct work

Nelson FSP Firestop Putty creates an instant smoke- and gas-tight fire seal to fill voids around pipes, electrical conduit, data communications cables, duct work, and between walls and floors.

Constructed of a blend of organic and inorganic intumescent materials, FSP putty expands with extreme heat to prevent the spread of fire and smoke. In addition, it is acoustically tested to reduce the transmission of noise and vibration.

Nelson FSP is pressed in place by hand, and requires no special equipment. Pre-mixed ready to use right out of the box, FSP putty also does not need additional blending, adhesives, or cable derating. It stays pliable at all times. And because it doesn't set, FSP can be easily removed and reapplied numerous times.

Nelson Firestop FSP is available in convenient bars or as putty pads. It is tested to UL-1479, ASTM E-84 and E-814.