It is Marvels product designed for glass regenerator and one of our leading products. It is also our traditional advantage for more than 50 years. We have many patents in this field. Based on raw material, it is divided as Pure Magnesia （GMB）, Magnesia Chrome（GMK）,  Magnesia Zirconia（GMZ）, Magnesia Olivine（GMS）and Low Porosity Fireclay(GDN).