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Tricarboxylic Acid Corrosion Inhibitor Tc65 CAS 80584-91-4 L190 Plus. Low Foaming & Air Release: Offers extremely low foaming tendency and excellent air release performance. Corrosion Inhibition: Excellent green water-soluble inhibitor for iron in metalworking fluids and coolants. Hard Water Compatible: Effective in hard water and maintains performance even in poor quality water. Nitrite Free Formula: Contains no nitrites and has no tendency to form nitrosamines. No Resinous Films: Does not form resinous films or gums on metal surfaces. Global Market Standard: Same quality as Irgacor L190, L190 Plus, and L190-85.