Flux for brazing at working temperatures above 600c as per din 8511 type f sh 1 dvgw tested reg no fi 033 for gas and water installations with copper pipes recommended by dvgw in accordance with worksheet gw 2 and gw 7 for use with silver containing brazing solder and all base materials made from steel copper and copper alloys brass and red bronze effective temperature range 500 800c flux residues must be carefully removed