Metacaulk® 950 is a water-based sealant designed for interior use and can be used on metal pipe, such as steel, EMT, copper and aluminum. May also be used on glass pipe, as well as telephone and power cables. Suitable for use with PVC and CPVC plastic pipe on closed (pressure) systems and on some insulated pipes. Metacaulk® 950 is formulated with inorganic materials, which will not create smoke or toxic gases when exposed to fire. For interior applications only it can not be used in areas where there is continuous vibration on the through-penetration opening or where wet conditions exist or may occur.