Cutback MC-800 is a medium curing (MC) cut-back asphalt consisting of penetration grade asphalt cement and diluent or cutter of medium volatility. The diluent temporarily reduces the viscosity of the asphalt cement for ease of handling and application. After application the diluent evaporates, leaving asphalt cement to perform its function. Petrochemical Trade Cutback MC-800 conforms to the specifications of ASTM D2127 (Medium-Curing Asphalt) or AASHTO M82a) Roofing – As a waterproofing membrane and as an adhesive to stick chippings onto a flat, horizontal roof to minimize the effects of weathering from the sun. b) Damp-Proof Courses – Used as damp-proof membranes in concrete floors particularly for small repairs or where extensions are keyed-in to existing structures.