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| The facing sand. |
The
facing sand used in foundry industries.The
facing sand which is used against the face of the pattern and which forms the face of the moulds.It is usually a mixture of old sand new moulding sand or other bonding materials and is prepared for use by first tempering with the right of water.It is then mild and riddle to produce a sand of fine texture and suitable born's which will give a smooth firm impressions of pattern against it is rammed when molten metal inter the moulds.
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The Black Sand
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The
back sand used in foundry industries. The sand black in the term some times used to describe foundry moulding sand or flour sand particularly in the iron foundry.Where because of addition coal dust to the sand and the action of hot Mattel every particle soon becomes catted with a santorini
black sand carbonation's film and the sand contains a considerable proportion of fine coal and coke particles.
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| The Synthetic Sand. |
The
synthetic sand usually refers to moulding sand prepared artificially from sharp or unbounded Silica sand by the addition of suitable bonding clay's. The
synthetic sand moulding sand mixture may and often do contains a proportion of naturally bonded sand.The terms in it's general seems will also include silica and mixtures bonded with cement or any of the organic materials.Such as oils and cereals binders usually closed under the heading of care binders.
