removal of the final traces of foundry sand.
removal of heat treatment scale from most ferrous and non-ferrous metals.
including ceramic, rust, coatings etc
MACHINED COMPONENT CLEANING
the process does not harm machined surfaces.
LT2/2014 OPERATION OF THE SODIUM HYDRIDE PROCESS
Sodium hydride is a powerful reducing agent. It is used in a bath of molten caustic soda, where it reacts with the Silica in foundry sands reducing it to a powder which is itself removed during the quenching and washing procedure.
Iron, steel, bronze, and aluminium castings are entirely cleared of the final traces of foundry sand even in the most intricate cavities which are difficult to reach by any other means.
Our process can be applied to all metals, except those with low melting points and those such as zinc, tin and their alloys which are readily attacked by caustic soda.
Treated metal is unaffected although with aluminium there is a reaction in the quenching bath which can slightly etch the surface which, in the majority of cases, is of no practical consequence.
With aluminium castings, it should be noted that the process temperature range of 350-370°C will spoil any heat treatments. If possible these should be applied after our process.