Product Introduction PHPA Powder for Water-Based Drilling Fluids A water-based mud must limit shale dispersion without hiding a separate pressure, mud-weight, hydraulics, or mechanical-stability problem. 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 charge.