UCON(r) quenchants are a series of nonflammable, aqueous solutions of a liquid organic polymer and a corrosion inhibitor. Quenchants A, HT and E are the principal members of the series and contain an inorganic nitrite salt as the corrosion inhibitor. Non-nitrite-containing formulations also are available, as UCON(r) quenchants A-NN, HT-NN and E-NN. UCON(r) quenchants designed as NN are completely compatible with their nitride-containing analogs without nitrosamine formation. Similar quenchant performance is obtained with either product.