This bentonite is used to manufacture synthetic moulding sands used in founding for making non-hardened (moist) moulds. The use of SPECJAL bentonite ensures the high quality of moulding sand. The essential advantages of moulding sands made with bentonite is the possibility of casting iron into moist moulds without having to dry them beforehand, and the possibility of their multiple reuse.
Bentonite is a material consisting mainly of smectite minerals, typically montmorillonites, possessing special swelling and water absorption properties. As an ingredient of a binding agent, it provides proper parameters for moulding sands and guarantees very good castings. It is characterised by good strength and high resistance to the temperature of molten metal.
SPECJAL bentonite is used specifically for casting. It is enhanced with sodium cations (i.e. activated) to radically improve its performance.
Advantages of using activated SPECJAL bentonite:
higher resistance of moulding sand to compression and tearing,
better resistance to high temperature,
greater swell factor, i.e. hydration of bentonite,
better flow of moulding sand.
SPECJAL bentonite is used on moulding lines and moulding machines. It is commonly used for the casting of iron, steel and non-ferrous metals.