Metacaulk Firestop Putty Pads are moldable, non-curing, intumescent fire-rated materials designed for through-penetration and electrical box firestop systems. When exposed to high temperatures, the material expands to form an insulating char that helps restrict the passage of flames, smoke, and hot gases through rated wall assemblies. These single-component putty pads are applied by hand—no mixing or special tools required—and adhere to common building surfaces. Ideal for metal and non-metallic electrical boxes, conduit, EMT pipe, cabling, and junction box applications, Metacaulk Putty Pads help maintain the integrity of fire-rated walls in commercial, industrial, and residential construction. The non-curing formulation allows for easy installation and re-entry when modifications are required, while the solvent-free, asbestos-free composition supports safe handling. Putty Pads have been tested in fire-rated systems up to 4 hours and are classified for use as fill, void, or cavity materials in listed assemblies.