It is composed of refractory aggregate, powder, sintering agent and admixture. Without water or liquid binder, it can form a dense and uniform integral unshaped refractory raw material through the sliding between particles and fine powder only by vibration. It is heated by thermosetting bonding agent or ceramic sintering agent to produce strength. Used in tundish working lining, hot metal ditch and electric furnace bottom, etc. Magnesium oxide powder manufacturers