Item/Grade	Mullite Insulating Brick
Item/Grade	JM23	JM 26	JM28	JM 30
Chemical Composition (%)
Al2O3	42	56	67	73
SiO2	55	41	30	24
Fe2O3	≤1	≤0.8	≤0.7	≤0.7
K2O + Na2O	1.1	1.7	1.7	1.7
Density (kg/m3)	600	800	900	1000
Classification Temperature (°C)	1300	1400	1500	1550
Cold Crushing Strength (MPa)	1.2	1.8	2.5	3.3
Modulus of Rupture (MPa)	1.0	1.7	2.3	3.1
Permanent Linear Change (%) x 24hrs	≤0.6	≤0.6	≤0.8	≤0.9
Thermal Expansion (%) 1000°C	0.5	0.52	0.52	0.53
Thermal Conductivity (W/m.k)
350°C	0.18	0.25	0.33	0.38
400°C	0.20	0.29	0.35	0.40
600°C	0.24	0.32	0.37	0.42

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