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The "C" at the end of part number PCE984275C stands for Conformal coating. Conformal coating are materials applied in thin layers (typically a few mils or a fraction of a mm) onto printed circuits or other electronic substrates. They provide environmental and mechanical protection to significantly extend the life of the components and circuitry. Conformal coatings protect electronic printed circuit boards from moisture and contaminants, preventing short circuits and corrosion of conductors and solder joints.