General Purpose, low temp. brazing flux which provides excellent adhesion and creamy smooth consistency. For brazing ferrous & nonferrous alloys. ULTRA FLUX® dissolves the oxides that form on copper, brass, nickel, monel, steel, and stainless steel during heating. Will not crystallize. It is a long lasting white paste type, very durable won’t break down from prolonged heat, an all-purpose flux for use in brazing and soldering Gold, Silver, Brass, Copper and other Non-Ferrous Metals. Effective from 1,100°–1,600°F, excess is removed with hot water. Provided in a 1 lb. jar. Made in USA.