When caustic magnesia is further heated at temperatures of between 1530 and 2300°C, the
grains of magnesia become sintered and the product obtained is nonhygroscopic and exhibits
exceptional stability and strength at high temperatures. This fine-grained product, with a density of 3400 kg.m–3, an average periclase grain size above 120 μm that contains at least 97 wt.%
MgO, is known as dead burned magnesia or sintered magnesia.
