NISOTEC CIRKOL HH are mineral-based circulation oils of premium quality formulated with additives for protection against oxidation and corrosion. NISOTEC CIRKOL HH oils are used in circulation systems for the lubrication of sliding bearings with an oil bath or oil mist, as well as gear transmissions that are not subject to shock or heavy loads, i.e. where oils with anti-wear and EP properties are not required.