Hot Max 24184 Aluminum Brazing Flux for WeldingProduct Description Formulated specifically for torch brazing aluminum and normally used with 4047, 4043, or 1100 brazing filler alloy. Can also be used for furnace and automatic flame brazing operations. Contains zinc chloride. Made in USA. Features Formulated specifically for torch brazing aluminum. Normally used with 4047, 4043, or 1100 brazing filler alloy. Can also be used for furnace and automatic flame brazing operations. Contains zinc chloride. Made in USA.