Other refractory, ceramic goods containing by weight more than 5% of graphite or other carbon or of a mixture of these products 石墨含量>50%的其他耐火陶瓷制品(包括含超过50%的其他碳及其混合物的制品),
Other refractory, ceramic goods containing by weight more than 5% of alumina(AL2O3)or of a mixture of compound of alumina and of silica (SiO2) 氧化铝含量>50%的其他耐火陶瓷制品(氧化铝包括三氧化二铝和二氧化硅的混合物或化合物),