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Refractory Cement: Clay, Iron Filings and Manganese, Fired Hard (Spon's Workshop Receipts)
A fireproof and waterproof cement from Spon's Workshop Receipts: dried clay, clean iron filings, peroxide of manganese, sea salt and borax, ground fine, wetted to a thick paste, applied at once and then heated slowly almost to white heat.
Fired, it is very hard and stands both red heat and boiling water.
Source: Spon, Workshop Receipts, first series, p. 24. Picture: the recipe.
Beginner
Unknown
Instructions
1
1
Dry and powder the clay
Dry and powder the clay
Dry 4 or 5 parts of clay thoroughly and pulverize it.
Materials for this step:
Raw Clay from Deposit1 4 or 5 partsTools needed:
Mortar and Pestle2
2
Mix the powders
Mix the powders
Add 2 parts of fine iron filings free from oxide, 1 part of peroxide of manganese, 1/2 part of sea salt and 1/2 part of borax. Mingle them thoroughly and make the mixture as fine as possible.
Materials for this step:
Iron Filings1 2 parts, fine, free from oxide
Manganese Dioxide (Pyrolusite)1 1 part
Coarse Sea Salt1 1/2 part
Borax Powder1 1/2 partTools needed:
Mortar and Pestle3
3
Make the paste, apply and fire
Make the paste, apply and fire
Work the powder into a thick paste with as much water as it needs, mixing thoroughly. Use it at once. After applying it, heat it gradually, almost to a white heat.
Materials for this step:
Water1 pieceTools needed:
Mortar and PestleMaterials
6- 1 4 or 5 partsPlaceholder
- 1 2 parts, fine, free from oxidePlaceholder
- 1 1 partPlaceholder
- 1 1/2 partPlaceholder
- 1 1/2 partPlaceholder
- 1 piecePlaceholder
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