For Clay roof tiles that are produced with a ceramic surface (engobe or glaze), this is burned in during firing process.
The firing of the tiles at a temperature of 900 to 1200°C in a tunnel kiln is the final part of the production process. After this step, the finished product is available for use. After firing, brick products are nonflammable and fire-safe for ever. Kiln and firing technologies as well as air stream systems have reduced the required firing time by up to two-thirds. This has created enormous advantages: a 50% decrease in the use of primary energy over the past ten years, up to 90% less emissions through thermal post-combustion equipment, optimized product quality and a substantial increase in capacity.
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