Dura-Fill H.S. is a specialty grade, premium quality crack and joint sealant, which is specifically formulated for direct-fired kettles. It is heat stabilized to withstand temperatures up to 450ºF without experiencing degradation. Conventional sealants must be melted in oil jacketed heating kettles which have longer melting timesand are more expensive than direct-fired kettles. Dura-Fill H.S. is relatively hard and has a high softening point, which makes it well suited for parking lots and driveways.It prolongs pavement life by sealing cracks and joints from water penetration.