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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.
Beginner
1 hour
Instructions
1
1
Sieve the sand
Sieve the sand
With a dust mask on, sieve dry fine quartz sand to remove stones and lumps.
Materials for this step:
Quartz Sand20 kgTools needed:
Fine Mesh Sieve
Dust Mask2
2
Add the clay
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.
Materials for this step:
Bentonite Clay2 kgTools needed:
Weighing Scale
Mixing TroughDust Mask3
3
Temper with water
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.
Materials for this step:
Water1 literTools needed:
Water Spray BottleFine Mesh Sieve4
4
Squeeze test
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.
5
5
Store damp
Store damp
Keep it covered in a lidded bucket so it stays damp; re-temper before each use.
Tools needed:
Metal Bucket with LidMaterials
3- 20 kgPlaceholder
- 2 kgPlaceholder
- 1 literPlaceholder
Tools Required
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