Foster H.I. Mastic is a black, durable protective weather coat for use over thermal insulation where an economical breathing mastic is required. H.I. Mastic is an asphalt emulsion. It will not shrink or crack during curing.
It has good weathering stability and develops with its final resistance to acids, alkalies, abrasion and other abuses typical of outdoor industrial conditions.
Operating temperature: -18 to 93°C.