HPP/HYPO Surface conditioning THPS Tetrakis[hydroxymethyl]Phosphonium Sulfate Biocide THPC Tetrakis[hydroxymethyl]phosphonium chloride Fire retardant Tetrakis[hydroxymethyl]Phosphonium Sulfate Urea Fire retardant THPC-UREA Tetrakis[hydroxymethyl]phosphonium chloride Urea Fire retardant PHOSPHINIC ACID Hypophosphorous Acid Reductant Show More