When used to melt metals should be non-metallic materials and high heat: the exterior is made of hardened steel, but inside, having to endure temperatures up to 1800 degrees, is coated with asbestos or refractory bricks.
-Asbestos is a mineral very resistant to high temperatures and has been used for up contruccion that in the past decade was found to be carcinogenic.
-refractory bricks are clay bricks which are manufactured with which have a high silica content, allowing them to withstand high temperatures steadily, as they have a very high melting point and are poor thermal conductors.
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| Old Blast Furnace Sestao, Vizcaya. |
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