HA UK offers a wide range of products for copper based alloys.

Oxidising flux in powder or tablet form, for use during crucible melting of tin bronzes, gunmetal, etc. Must be followed by Cudox deoxidant. OXICOVER 501 is normally used in powder form, but is also available in 250g tablet form. It is a mildly oxidising flux used for the crucible melting of tin-bronzes, gunmetal, etc. where the quality of the ingot or returns is relatively clean. To eliminate pinholes due to hydrogen pick-up, bronzes and similar alloys should be melted under oxidising conditions to prevent hydrogen absorption. At the end of the melting cycle, the oxygen is removed by the use of CUDOX TUBES.

CUPROCOVER B503 is a grey granular refining and covering flux for use with a wide range of zinc-bearing copper based alloys. It produces a fluid slag to dissolve and remove dirt and other impurities in the process of recovering metal from swarf, drosses and other residues in crucible and reverberatory furnaces. CUPROCOVER B503 can be used with a range of non-ferrous alloys, including brass, gunmetal and tin bronzes. It is important to maintain a complete cover over the molten metal to prevent oxidation during melting. Can be also used as wall cleaner for copper alloy residues.

Reducing flux for the melting of high conductivity copper,and designed to minimise oxidation.

CUPROCOVER 511 is a neutral refining and covering flux for use with copper based alloys. It produces a fluid slag to dissolve and remove dirt and other impurities in the process of recovering metal from swarf, drosses and other residues. CUPROCOVER 511 can be used with a range of non-ferrous alloys, including commercial copper, brass, gunmetal, phosphor-bronze and tin bronzes. It is important to maintain a complete cover over the molten metal to prevent oxidation during melting. It is best suited for use in large melting units such as reverberatory or rotary furnaces.

CUDOX TUBES are copper tubes containing a high grade deoxidant, pre-packed in measured amounts, for treating copper based alloys. CUDOX TUBES contain deoxidants in granular form which enable the deoxidant to be immediately dissolved by the melt. Although phosphor-copper cake is a satisfactory deoxidant, it is not the best or the cheapest way of adding phosphorus because some is volatilised and some lost within the dross while the cake slowly melts. It is also difficult to add in precise amounts, which is essential if gas-free metal is to be obtained. CUDOX TUBES should not be used for treating high conductivity copper. Calcium Boride, or Lithium based deoxidants should be used for this application.

An oxidising flux that effectively removes aluminium contamination from brasses and bronzes. ALUMINIUM REMOVER is a light grey powdered flux for treating brasses and bronzes. It is a fluid, oxidising flux, which effectively removes aluminium contamination from brasses and bronzes.

Coagulates the slag on ferrous and copper based alloys to form a viscous, crusty layer, which can easily be removed. A very efficient thermal insulator, suitable for use on casting ladles. SLAG COAGULANT is a grey, granular powder. It is used for the treatment of copper alloys, iron and steel in furnaces and ladles. SLAG COAGULANT contains processed metallic oxides in a definite physical phase, which exfoliates and melts at temperatures above 970°C.

EXF 290 is a cleansing and protective flux for use with aluminium-bronze alloys and is suitable for use in crucible furnaces. EXF 290 initially provides a fluid, protective cover, which effectively reduces the formation of oxides and gas pick-up, therefore minimising aluminium (and zinc) losses. As the flux absorbs oxides, a dry dross forms which can be easily removed.

Carbon based product forming non-fusing, reducing cover in pellet form. The reducing atmosphere makes it suitable for use on zinc bearing copper base alloys as it will minimise zinc losses. EXF320 will also provide some insulation effect due to the air gaps formed in the covering layer. This product is especially suited for use on launder systems as it will not adhere to the launder or in-line monitoring probes such as thermocouples.

To ensure an optimized product selection according to your needs; please contact your nearest HA-Representative.