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AMC FILTREX™ is a high molecular weight polymer emulsion. When added to a water-based drilling fluid, it reduces the rate at which drilling fluid pressure invades the borehole wall during drilling. AMC FILTREX™ can also be used when drilling into reactive clays and shales, reducing pore pressure transmission and improving filtrate control. AMC FILTREX™ is effective in brittle, water-sensitive formations.