Sillimanite Bricks

Sillimanite bricks feature a low thermal expansion rate, excellent resistance to corrosion from metallurgical slag and various molten glasses, and good high-temperature wear resistance. They have good high-temperature thermal stability, minimal pollution to molten glass, and high refractoriness under load.

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Physical and Chemical Indicators

Item	Sillimanite Brick 65	Sillimanite Brick 60
Al₂O₃ (%)	≥ 65	≥ 60
SiO₂ (%)	≤ 32	≤ 35
Fe₂O₃ (%)	≤ 0.5	≤ 1.0
Apparent Porosity (%)	≤ 18	≤ 19
Bulk Density (g/cm³)	≥ 2.5	≥ 2.4
Cold Crushing Strength (MPa)	≥ 80	≥ 80
Refractoriness Under Load (0.2MPa, ℃)	≥ 1650	≥ 1600
Permanent Linear Change (%) (1400℃×2h)	± 0.2	± 0.2

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