Product Introduction Partially Hydrolyzed Polyacrylamide Powder for Fluid Loss Control Filtrate control protects the borehole and pay zone only when filter-cake quality, rheology, and solids remain balanced. BLUFLOC powder PHPA is described in the supplied family TDS as a water-soluble copolymer of anionic character used in drilling-fluid and selected oilfield applications. The four powder grades span very-high and ultra-high molecular-weight classes with medium or high