Metacaulk® 835+ is for applications that require a silicone-based firestop. Designed for use with PVC pipe on closed (pressure) systems, EMT, insulated and uninsulated steel pipe, construction and control joints and interior expansion joints. Flexible, non-sag and low odor sealant for exterior or interior use. Used in systems where dynamic movement is expected. Application temperature -20°F to 120°F. Color: gray.