Aluminum Brazing Flux (Cesium Content Flux ) Products Usage: TiBright's aluminum brazing flux is an excellent choice for the low-temperature joining of many aluminum alloys (excluding 5000 series) when using Zinc/aluminum barebrazing rods, mostly use as the flux for aluminum -copper joint brazing.This fluxbegin to melt at less than380 degrees C (720 degrees F), with a highly active range from420Celsius degree(785degrees F) approximately48 degrees C (900 degrees F) Physical description: