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AMC CORVIS™ is a high molecular weight, powdered polymer which has been developed to improve core recovery, particularly in clays and shales and highly fractured formations. It provides cuttings encapsulation as well as helping to stabilise the formation. AMC CORVIS™ forms a protective polymer film on the drill pipe and bit as well as on the walls of the bore hole which helps to provide lubrication when diamond drilling in troublesome formations.