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1700℃窑炉用刚玉砖 #刚玉砖#炉顶砖#耐火砖#窑炉#源头实力厂家耐高温1700℃高纯刚玉砖，工业高温窑炉核心耐火标配1700℃ High-Purity Corundum Bricks, Core Refractory for Industrial High-Temperature Kilns极致耐热抗热震，1700℃窑炉专用刚玉耐火砖Excellent Thermal Shock Resi

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