Perma-Tac® 99 is a Liquid antistrip for hot asphalt mixes. Heat Stability: Perma-Tac® 99 meets the heat stability test requirements of state highway testing laboratories. Easy Handling and Storage: Perma-Tac® 99 is a low viscosity liquid product with good low temperature handling properties. Use 0.25-0.75% by weight of asphalt is recommended, which should be determined in laboratory mix design tests. Perma-Tac® 99 is preferably added to the asphalt at the hot-mix plant by means of a specially designed injection system. Alternatively, the product can be incorporated into the asphalt by mechanical agitation, pump circulation of the storage tank, or by injection into the asphalt loading line followed by recirculation through the truck bypass system until properly mixed.