Question

what is sorrel cement

Answer 1

Sorel cement (also known as magnesia cement) is a non-hydraulic cement first produced by Frenchman Stanislas Sorel in 1867.

The cement is a mixture of magnesium oxide (burnt magnesia) with magnesium chloride with the approximate chemical formulaMg4Cl2(OH)6(H2O)8, corresponding to a weight ratio of 2.5–3.5 parts MgO to one part MgCl2.[1] A variant uses zinc oxide with zinc chlorideinstead of the magnesium compounds.

Answer 2

Sorel cement is a non-hydraulic cement first produced by Frenchman Stanislas Sorel in 1867. 
Sorel cement, also called magnesium oxychloride cement (MOC), is a non hydraulic cement