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Furnaces. Fireproof Cement A paste or mortar that will close up cracks in furnaces to keep the gas from escaping can be made as follows :-Mix together 75 parts of wet fireclay, 3 parts of black oxide manganese, 3 parts of white sand, and 1 part of powdered asbestos. Thoroughly mix by adding enough water to make a smooth paste. Apply this paste over the cracks and when dry it will be as hard as iron and stick like glue.
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