OPTOOL UD509 is a high-performance modified perfluoropolyether (PFPE) anti-fingerprint and anti-fouling surface treatment agent (commonly known as AF anti-fingerprint oil) developed by Daikin Industries, Ltd. of Japan. It forms a nano-scale ultra-thin protective film through a chemical reaction with the substrate surface, making it a high-end industrial coating known for its excellent wear resistance and smooth surface finish.

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