Designed specifically for use with silver solders like Silvaloy 355. Protects the work piece and improves the flow characteristics of solder. Creamy texture applies easily with brush, resists drying and caking. Works up to 1600deg F. on all metals except aluminum, magnesium and titanium. Mfg: Brownells SPECS: Meets Fed. Spec OF499, Type-B, AMS 3410.