Magnesia bricks

Magnesia bricks are basic refractory materials with strong resistance to alkaline slag. They feature high refractoriness and high refractoriness under load, and are primarily used in steel metallurgical furnaces, glass melting furnace regenerators, etc.

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Physicochemical Properties:

Item	M98	M97A	M97B	M95A	M95B	M91	M89
MgO (%)	≥ 97.5	≥ 97	≥ 96.5	≥ 95	≥ 94.5	≥ 91	≥ 89
SiO₂ (%)	≤ 1.0	≤ 1.2	≤ 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	≥ 3.0	≥ 2.95	≥ 2.95	≥ 2.9	≥ 2.85
Cold Crushing Strength (MPa)	≥ 60	≥ 60	≥ 60	≥ 60	≥ 60	≥ 60	≥ 50
Refractoriness Under Load (0.2MPa,℃)	≥ 1700	≥ 1650	≥ 1560	≥ 1500	/	/	/
Permanent Linear Change (%)	-0.2~0 (1650℃×2h)	-0.3~0 (1650℃×2h)	≥ 60	-0.6~0 (1600℃×2h)	/	/

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