Vio-Flux High Activity Flux Paste is an acid-based flux for use with stainless steel, monel, inconel, high-chrome alloys, nickel, copper, brass, ferrous alloys, soft metals, and many more. The blend of acids used allow this flux to become active at room temperature, exerting a strong scavenging action to remove oxide coatings and other impurities, producing clean, strong joints.