Product Introduction Anionic PHPA Powder for Low-Solids Water-Based Mud Low-solids PHPA mud seeks shale control and useful rheology while minimizing colloidal clay and drilled-solids accumulation. 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. The