Firestop Putty
This information reflects our best understanding of product composition in 2022.
Firestopping putty is a fire-rated intumescent material capable of expanding when temperatures reach approximately 350°F. The activation temperature of the firestopping putty protects joint openings, electrical boxes, cabeling, junction boxes, and...
Firestopping putty is a fire-rated intumescent material capable of expanding when temperatures reach approximately 350°F. The activation temperature of the firestopping putty protects joint openings, electrical boxes, cabeling, junction boxes, and HVAC systems from the spread of flames, smoke, gas, and water for 2 - 4 hours. The putty is moldable and comes in stick or pad form. The intumescent component of the firestopping putty, which allows the putty to expand in a fire, is composed of a carbon donor, phosphorous donor, and a nitrogen source. It is also important to note that the intumescent additives can perform other functions as well, such as stabilizers, flame retardants, or fillers.