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Highly Sulfonated Lignite Polymer Filtration Control Drilling Fluid Additive. High Salt Tolerance: Tolerant of high concentrations of NaCl, KCl, CaCl2, and magnesium salts. Solubility in High Brines: Highly sulfonated lignite polymer soluble in high brines where others fail. Improved Filtration Control: Reduces viscosity and gel strengths, forming thin, tough filter cakes. Versatile Application: Recommended for all high brine fluids to lower rheological properties. ISO Certified: Product meets ISO certification standards for quality assurance. Eco-Friendly Product: Designed with environmental protection considerations in mind.