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 6903100000 
石墨含量＞50%的其他耐火陶瓷制品
Other refractory, ceramic goods containing by weight more than 50% of graphite or other carbon or of a mixture of these products |
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6903200000
氧化铝含量＞50%的其他耐火陶瓷制品
Other refractory, ceramic goods containing by weight more than 50% of alumina(AL2O3)or of a mixture of compound of alumina and of silica (SiO2) |
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