FLUXES FOR COPPER BASED ALLOYS

OXICOVER 501 (CUBROFLUX 221)

Mildy oxidising flux in powder or tablet form, for use during crucible melting of tin bronzes, gunmetal, etc. where the quality of the ingot or returnes 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 (CUBROFLUX 350)

A grey granular refining and covering flux for use with a wide range of zinc-bearing copper based alloys including brass, gunmetal and tin bronzes. 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. 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.

CUPROCOVER B505

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

CUPROCOVER 511

A neutral refining and covering flux for use with copper based alloys including commercial copper, brass, gunmetal, phosphor-bronze and tin bronzes. 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. It is important to maintain a complete cover over the molten metal to prevent oxidation during melting. It is suited for use in large melting units such as reverberatory or rotary furnaces.

CUDOX TUBES

Copper tubes containing a high grade deoxidant, pre-packed in measured amounts, for treating copper based alloys. CUDOX TUBES contain deoxidant 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 volatilized 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.

ALUMINIUM REMOVER

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.

SLAG COAGULANT

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

CUPROCOVER AB520

A cleansing and protective flux for use with aluminium bronze alloys and suitable for use in crucible furnaces. CUPROCOVER AB520 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.