PROPHALTis a revolutionary, high-performance, flexible, reactive repair product for use in repairing asphalt and concrete road surfaces PROPHALT reacts with water to provide a permanent repair solution. All sizes are free of solvents or volatile organic compounds (VOCs). PROPHALT comes in three (3) sizes (4.0mm, 6.0mm, & 9.0mm) for surface, intermediate, or base repairs for any type of asphalt or concrete road repair.