Types of molding sand:
Green sand:
Natural sand alongside moisture
Dry sand:
Not suitable for large castings
Facing sand:
This sand is used straight side yesteryear side to the surface of the designing in addition to comes into contact alongside the molten metallic when the mould is poured.
As a result, it is subjected to the severest weather condition in addition to must possess, therefore, high forcefulness in addition to refractoriness. This sand too provides a smoother casting surface in addition to should endure of fine texture. It is made of silica sand in addition to clay, in addition to about additives without the improver of used sand.
Facing sand is ever used to brand dry out sand moulds land organisation sand is often used for dark-green sand molding.
Parting sand:
This sand is used to forbid adhering of ii halves of mould surfaces inwards each molding box when they are separated. Thus, to ensure adept parting, the mould surface (at contact of get produce in addition to Drag) should endure treated alongside parting sand or another parting material.
It is too sprinkled or applied on the designing surface (before the molding sand is seat over it) to avoid its sticking in addition to let its slowly withdrawal from the mould. The parting sand is fine dry out sand.
Backing or flooring or dark sand:
This is the sand which is used to dorsum upwards the facing sand in addition to to fill upwards the whole book of the flask. Old, repeatedly used molding sand is mainly employed for this purpose.
Core sand:
The nitty-gritty sand mainly consists of silica sand in addition to an organic binder, alongside real little, if any, clay content. The presence of clay inwards nitty-gritty sand reduces its permeability in addition to collapsibility. The nitty-gritty sand may comprise pocket-size percentages of other constituents also, to get upwards its properties.
Loam sand:
50 % of clay in addition to dried difficult in addition to using for large castings