Product Short Description: RXSOL 664 is a diphase, liquid product based on volatile aliphatic solvent and also containing tar-acids, corrosion inhibitors and alkaline soaps. Product Description: RXSOL 664 is a diphase, liquid product based on volatile aliphatic solvent and also containing tar-acids, corrosion inhibitors and alkaline soaps. It is used for the removal of hard carbon and paint from engineering components and equipment.