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If you want foundry consumables locally call METCAST and ask for Gordon, he will be able to help. Not a spectator I work there now.

Do you mean as a mould or in the furnace? Ok in a mould but won't last in the furnace. Even green sand only lasts one pour before it needs new bentonite clay, coal dust and water added along with a...

Not many of those around now. Need for thin wall castings 1350 to 1500 C and a lot different refractory than the average non-ferrous foundry runs.

These are not made anymore and getting hard to find. The link given is over the ditch but would still be worth it. If not just make one up out of some 6 to 10mm plate.
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I worked for Masport Foundry (Now Precision Foundry ) for ten years as Senior technician and was involved with every stage of making these. They were originally shot blasted as opposed to sand...