JM Mullite Insulating Bricks

Mullite insulation bricks have high refractoriness and can directly contact the flame. They feature light weight, high strength, low thermal conductivity, good thermal shock resistance, and significant energy-saving effects.

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Physical and Chemical Indicators

Item	JM23	JM25	JM26	JM27
Al2O3 %	≥ 40	≥ 50	≥ 55	≥ 60
Fe2O3 %	≤ 1.0	≤ 1.0	≤ 0.9	≤ 0.8
Bulk Density (g/cm³)	≤ 0.55	≤ 0.80	≤ 0.85	≤ 0.9
Cold Crushing Strength (MPa)	≥ 1.0	≥ 1.5	≥ 2.0	≥ 2.5
Permanent Linear Change (%) (-1.5 ~ 0.5)	1230℃×12h	1350℃×12h	1400℃×12h	1450℃×12h
Thermal Conductivity W/(m·K)	200±25℃ ≤ 0.18	200±25℃ ≤ 0.26	200±25℃ ≤ 0.28	200±25℃ ≤ 0.32
Thermal Conductivity W/(m·K)	350±25℃ ≤ 0.20	350±25℃ ≤ 0.28	350±25℃ ≤ 0.30	350±25℃ ≤ 0.32
Thermal Conductivity W/(m·K)	600±25℃ ≤ 0.22	600±25℃ ≤ 0.30	600±25℃ ≤ 0.33	600±25℃ ≤ 0.36
0.05MPa Refractoriness Under Load T0.5 (℃)	≥ 1080	≥ 1200	≥ 1250	≥ 1300

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