Fluxed binders - for brazing in air Binder Code Binder Code AQC HIAF Fluxing range (ºC) Fluxing range (ºC) 530 - 870 535 - 875 Binder Characteristics Binder Characteristics Does not dry and is therefore the most suitable for applications where the paste is packed in cartridges which will only be used over a long period. When heated, the paste deposit is slightly mobile and therefore it should be used on applications where there is a shoulder to contain its movement Material cn be used for cartridge applications, but it does not have the long shelf life of the AQC system. Paste deposit is not mobile (i.e. restrictive) and can therefore be used on narrow shoulders. Its drying characteristics are occasionally employed to hold small items in position prior to heating Fluxless binders - for brazing through an atmosphere furnace Binder Code Characteristics DC Paste deposit does not dry and is mobile when heated. Very clean joint after soldering (i.e. no residue) DCA Characteristics similar to DC but deposit is not as mobile For applications where the atmosphere is marginal, small flux additions can be made to these binders to assist alloy flow Metal Content The metal content of a paste is determined by the requirements of the application, although in practice it has been found that a paste with a metal content of 65% is suitable for most air-brazing operations, while 85% is appropriate for most furnace applications for which a flux is not required.