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Calcined magnesite: Calcined magnesite, passing 97%
(minimum) through 150 micron and 95% (minimum)
through 75 micron IS sieves, having magnesium oxide
(MgO), per cent by mass 87 (minimum), calcium oxide
(CaO), per cent by mass 2⋅5 (maximum), carbon dioxide
(CO2), per cent by mass 2⋅5 (maximum), loss on ignition
(CO2 and H2O), per cent by mass 8 (maximum), total
contents of MgO, CaO, Al2O3, SiO2 and loss on ignition,
per cent by mass 99⋅5 (minimum).

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