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Refractory Cement: Clay, Iron Filings and Manganese, Fired Hard (Spon's Workshop Receipts)
Charlie

Imeundwa na

Charlie

4. Novemba 2026DE
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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.
Mwanzo
Unknown

Maagizo

1

Dry and powder the clay

Dry 4 or 5 parts of clay thoroughly and pulverize it.

Vifaa kwa hatua hii:

Udongo ghafi kutoka shimoniUdongo ghafi kutoka shimoni1 4 or 5 parts

Zana zinazohitajika:

Kinu na mchiKinu na mchi
2

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.

Vifaa kwa hatua hii:

Vinyoo vya chumaVinyoo vya chuma1 2 parts, fine, free from oxide
Dioksidi ya manganizi (pairolusiti)Dioksidi ya manganizi (pairolusiti)1 1 part
Chumvi ya Bahari MbichiChumvi ya Bahari Mbichi1 1/2 part
Poda ya boraksiPoda ya boraksi1 1/2 part

Zana zinazohitajika:

Kinu na mchiKinu na mchi
3

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.

Vifaa kwa hatua hii:

MajiMaji1 kipande

Zana zinazohitajika:

Kinu na mchiKinu na mchi

Vifaa

6

Zana Zinazohitajika

1

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