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AMC BIT GUARD™ is a vegetable oil based lubricant that has been developed as a surface-acting rate of penetration (ROP) enhancer and is designed for use in water-based drilling fluid systems. Its properties were designed for the operating parameters at the face of an impregnated diamond bit giving improved penetration rates and extended bit life. A fluid system containing AMC BIT GUARD™ promotes hydrophobic coating on both the bit and cuttings surfaces. This prevents clay and shale cuttings from balling up the bit and blocking nozzles, improving bit cutting efficiency and increasing penetration rates.