Workshop Technology
Green sand is a mixture of

70% sand and 30% clay
50% sand and 50% clay
30% sand and 70% clay
90% sand and 10% clay

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Workshop Technology
The purpose of a riser is to

Deliver molten metal into the mould cavity
Feed the molten metal to the casting in order to compensate for the shrinkage
Deliver the molten metal from pouring basin to gate
Act as a reservoir for the molten metal

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