They are blackening emulsions that clean tempering oxides, protect the part from corrosion, and give it a dark black, shiny and decorative appearance. They are highly resistant to heat. There is no risk of fire since they contain water. They do not produce disturbing oil smoke during the cooling of the workpiece from tempering temperature. ...

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They are pastes used to protect surfaces against carbon diffusion during cementation or carbonitriding. They provide protection against carbon diffusion in areas that are not desired to be hardened in order to facilitate machining after heat treatment. They are available in solvent-based and water-based types. ...

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