Why first use of ceramic fiber textile will turn black


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Why a circle appears on the furnace door, and black

Pictured above, customer complaint why a circle appears on the furnace door, and black?

Please don't worry, this is our door when finishing grinder grinding head of impressions, in order to beautiful and coated with a layer of thin we repair material. Organic matter was not released in full upon initial combustion will occur this circle is black; Continuously heated to 600 degrees will have the opportunity to be released in full, the phenomenon will disappear.


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