Refractory BricksMagnesia and basic bricks

Magnesia-Iron Spinel Brick

Chrome-free basic brick for the cement kiln firing zone, with excellent kiln-coating adhesion, good thermal shock resistance, cement clinker resistance and low thermal expansion. Standard (MIS) and high-toughness (HMIS) types.

Grades / types: MIS, HMIS

Product overview

Magnesia-iron spinel brick is a chrome-free product for the firing zone of cement kilns. It has excellent kiln-coating adhesion, good thermal shock resistance, resistance to cement clinker attack and a low thermal expansion rate, and performs well in the cement kiln firing zone.

Key characteristics

Chrome-free basic brick
Excellent kiln-coating adhesion
Good thermal shock resistance
Resistance to cement clinker attack
Low thermal expansion rate

Technical data

Physical and chemical specification
Property	Unit	MIS — Magnesia-iron spinel brick	HMIS — High-toughness magnesia-iron spinel brick
MgO	%	≥85	≥88
Fe₂O₃	%	5~7.5	5~6
Al₂O₃	%	3~5	4~7
Bulk Density	g/cm³	≥3	≥2.9
Apparent Porosity	%	≤17	≤16
Cold Crushing Strength (CCS)	MPa	≥45	≥55
Thermal Shock Resistance (TSR) (1100℃ Water)	cycles	≥6	≥8
Refractoriness Under Load, 0.2 MPa (RUL)	℃	≥1600	≥1650
Thermal Expansion Rate (1400℃)	%	≤1.6	≤1.7
Thermal Conductivity (350±25℃)	W/(m·K)	≤2.6	≤2.6