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Bentomix Oil Sand 25Kg (This moulding sand is ready to use)
(Image shows Mansbond)
Bentomix sand has a special oil binder instead of bentonite clay and water as used in traditional greensand. No steam is generated when the metal is poured. This means that there is a reduced need for venting of the mold and the sand doesn't need to be as permeable. Therefore a finer mesh of sand is used which results in a finer finish on the cast part. This also means that the sand does not dry out by evaporation.
The sand is used exactly like greensand and the same working practices are followed. It is better for use with the lower non ferrous melting point metals as cast iron will char the surface very deeply leading to a thick layer having to be sieved and discarded. Greensand is best for cast iron. Moulds must be cast in a well ventilated area and allowed sufficient time to cool as opening too quickly may lead to the oil vapour igniting.