Greensand Casting Sand

Green sand is moulding sand that is used damp: fine silica sand bound by a little clay and water, so it packs firm round a pattern, holds a sharp shape, and lets steam escape when hot metal is poured. 'Green' means unbaked, not the colour. Bentonite clay is the usual binder; the mix is tempered with water until a squeezed handful holds its shape and breaks cleanly.

초급

1 hour

안내

Sieve the sand

With a dust mask on, sieve dry fine quartz sand to remove stones and lumps.

이 단계의 재료:

규사20 kg

필요한 도구:

고운 체

방진 마스크

Add the clay

Weigh in bentonite at about a tenth of the sand's weight and mix it through dry in the trough until the colour is even.

이 단계의 재료:

벤토나이트 점토2 kg

필요한 도구:

계량 저울

반죽 구유

방진 마스크

Temper with water

Mist water over it a little at a time, rubbing the sand between your hands and through the sieve to spread the clay and water evenly.

이 단계의 재료:

물1 리터

필요한 도구:

분무기

고운 체

Squeeze test

Squeeze a handful. It should hold the print of your fingers and break cleanly in two when bent, not crumble or stick to your hand. Add sand if sticky, water if crumbly.