Firestopping caulks are usually silicon or latex based.
Some of the silicon based firestopping materials are very similar to a water sealant and have the ability to be used where the environmental exposure is more severe (exposure to moisture or exterior wall openings).
“Non-sag” caulks and sealants are available for wall applications. These materials do not flow or run when applied in a vertical configuration such as a wall penetration.
Useful for openings in which the penetrating items are subject to movement or vibration.
As part of a UL classified assembly, firestop caulk is used in firestop designs based on specific thicknesses of the material and may include mineral fiber or damming material.