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Sintered Magnesia Bricks

Magnesia brick is an alkaline refractory material with magnesia content above 90% and periclase as the main crystal phase. Magnesia brick is a refractory brick made of fused magnesia and sintered magnesia at high temperature. Magnesia bricks have high refractoriness, good resistance to alkaline slag, high load softening temperatures, but poor thermal shock resistance.


Technical Data of magnesia bricks:

Items Physical and Chemical characters
M-98 M-97A M-97B M-95A M-95B M-97 M-89
MgO % ≥ 97.5 97.0 96.5 95.0 94.5 91.0 89.0
SiO2 % ≤ 1.00 1.20 1.5 2.0 2.5
CaO %≤ 2.0 2.0 3.0 3.0
Apparent Porosity   % ≤ 16 16 18 16 18 18 20
Bulk Density g/cm3 ≥ 3.0 3.0 2.95 2.90 2.85
Cold Crushing Strength  MPa ≥ 60 60 60 60 50
0.2Mpa Refractoriness Under Load ℃≥ 1700 1700 1650 1560 1500
Permanent linear change  % 1650℃×2h  -0.2~0 1650℃×2h -0.3~0 1600℃×2h -0.5~0 1600℃×2h -0.6~0

Application of Magnesia bricks:

Magnesia bricks are mainly used for steel-making alkaline open-hearth, electric furnace bottom and wall, oxygen converter lining, non-ferrous metal smelting furnace, high-temperature tunnel kiln, short magnesia brick, and cement rotary kiln lining, furnace bottom and wall of heating furnace, glass Kiln regenerator, etc.

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