Metacaulk 1000 is a water based, single-component, general purpose, fire-rated sealant for through-penetrations on both vertical and horizontal surfaces, as well as construction joints. It is designed for use in floors or walls and can be used on PVC, CPVC, ABS, PVC foam core, ABS foam core, PP or plastic pipes, polybutylene (PB), insulated and uninsulated steel pipe, copper and cast iron. STC 54*. Complies to Required Environmental Testing of Accelerated Aging and High Humidity as per UL 1479 Fire Test of Through-Penetration Firestops. Metacaulk 1000 will prevent the spread of flames, smoke, hot gases and water through joint openings and through-penetrations. No dilution or mixing is required for use. No special skills are necessary for installation.