Nitrile (acrylonitrile-butadiene) rubbers are produced by a technology of cold emulsion copolymerization of butadiene and acrylonitrile, and coagulated by a system of acid and synthetic coagulant, stabilized by non-staining antioxidant. Nitrile rubbers are appropriate for production of technical articles resistant to oils and liquid fuels. They contain a nonstaining stabilizer and so can be used for production of goods in light colors. Nitrile rubbers KER® does not contain any components excluding usage of KER® for production of articles coming into contact with foodstuffs. Nitrile rubbers offered by company Synthos are sold under trade mark KER® and are produced by Synthos Dwory 7 sp. z o.o spółka jawna located in Poland.