Which of the following would NOT be considered a firestop material?

Regular paint would not be considered a firestop material because it does not possess the necessary properties to impede the spread of fire or smoke through openings in a building's construction. Firestop materials are specifically designed to respond to fire conditions, typically expanding or hardening to seal gaps and openings in walls and floors, thus preventing fire and smoke from moving from one area to another.

In contrast, intumescent sealants, fire-resistant mortars, and firestop pillows all serve specific functions in firestop systems. Intumescent sealants expand when exposed to high temperatures, forming an insulating layer that blocks fire and smoke. Fire-resistant mortars are formulated to create strong barriers against fire, supporting structural integrity in fire scenarios. Firestop pillows can be used to fill openings and voids, providing temporary or permanent firestopping solutions. These materials are specifically tested and rated for firestop applications, unlike regular paint, which does not have these fire-resistant qualities.