Normal magnesia brick is made of Alumina-Magnesia spinel, periclase, It has higher temperature strength, good thermal shock stability, strong resistance to basic slag. 普通镁铝以镁铝尖晶石和方镁石为主要晶相，具有较高的高温强度和较好的热稳定性，抗碱性炉渣侵蚀。
Sex of alkali resistance of pure cotton cloth is strong, can use all sorts of soap and scour catharsis. 纯棉布耐碱性强，可用各种肥皂及洗涤剂洗涤。
