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Model number of fireclay brick:sk**2 , sk**4 , sk**6, sk**7 , It has good thermal shock resistance and its fluctuation range is big that is generally more than *0 times Fireclay brick belongs to weak acid refractory products, which acid performance is enhancing along with the increase of SiO2 content. Fireclay brick has definite erosion resistance to acid slag but weak resistance to alkaline slag. Therefore fireclay brick is suitable for the lining of the furnace with acid slag. Contact Email sinian***6 AT hotmail DOT com Pls tell me your company name, email, website, tel and fax, if there is possibility.