Abstract
Magnesium oxysulfate (MOS) cement is formulated using specific ratios of light-burn magnesium oxide and magnesium sulfate. MOS cement has impressive fire resistant properties is rapid hardening, has low thermal conductivity and good abrasion resistance. However, it undergoes non-reversible strength loss in prolonged contact with water due to hydrolysis of the MOS binding phase. Certain additives can mitigate this hydrolysis reaction.
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