Refractory BricksMagnesia and basic bricks

Magnesia-Alumina Spinel Brick

Magnesia spinel brick with uniform expansion and contraction under temperature fluctuation, better thermal shock resistance, refractoriness under load and strength than magnesia brick. Grades MLJ-75 to MLJ-90.

Grades / types: MLJ-90, MLJ-85, MLJ-80, MLJ-75

Product overview

Magnesia-alumina spinel brick expands and contracts relatively uniformly when the temperature fluctuates. Its thermal shock resistance, refractoriness under load and strength are better than those of magnesia brick, and its resistance to alkaline slag and iron oxide slag is stronger.

Key characteristics

Uniform expansion and contraction under temperature fluctuation
Better thermal shock resistance than magnesia brick
Higher refractoriness under load and strength than magnesia brick
Stronger resistance to alkaline slag and iron oxide slag

Technical data

Physical and chemical specification
Property	Unit	MLJ-90	MLJ-85	MLJ-80	MLJ-75
MgO	%	≥90	≥85	≥80	≥75
Al₂O₃	%	3~8	5~12	8~17	≥8~12
Apparent Porosity	%	≤17	≤17	≤16	≤19
Bulk Density	g/cm³	≥2.95	≥2.95	≥2.90	≥2.85
Cold Crushing Strength (CCS)	MPa	≥45	≥45	≥55	≥40
Refractoriness Under Load, 0.2 MPa (RUL)	℃	≥1700	≥1700	≥1700	≥1650
Thermal Shock Resistance (TSR) (1100℃ Water)	cycles	≥3	≥8	≥12	≥8