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Mullite insulating refractory bricks

Al₂O₃ (%):40～73; SiO₂ (%):24～57; Fe₂O₃ (%) ≤0.7～11
Cold Crushing Strength(MPa): 0.8～3.3
Permanent Linear Change×24h(%)≤0.5～0.9

Application:

Mullite insulating refractory bricks are widely used as working linings for cracking furnace, hot blast stove, ceramic roller kiln, shuttle kiln, pot furnace for glass smelting, all kinds of electric furnaces, etc.

　　Mullite insulating refractory bricks belong to new excellent insulating refractory materials, which Al₂O₃ content is 40%～75%, with Al₂O₃·2SiO₂ as main phase and binding phase.

　　As the insulating refractory bricks body are made of tiny air space similar to honeycomb that the bricks have a excellent insulating properties.

Description	JM20	JM 23	JM 26	JM 28	JM 30
Chemical Composition(%)
Al₂O₃	40	42	56	67	73
SiO₂	57	55	41	30	24
Fe₂O₃	≤11	≤1	≤0.8	≤0.7	≤0.7
K₂O+Na₂O	1.1	1.1	1.7	1.7	1.7
Physical properties
Density(kg/m³)	550	600	800	900	1000
Classification Temperature(℃)	1260	1300	1400	1500	1550
Cold Crushing Strength (MPa)	0.8	1.2	1.8	2.5	3.3
Modulus of Rupture (MPa)	0.8	1.0	1.7	2.3	3.1
Permanent Linear Change(%)×24h	≤0.5	≤0.6	≤0.6	≤0.8	≤0.9
Thermal Expansion(%)1000℃	0.48	0.5	0.52	0.52	0.53
Thermal Conductivity(W/m.k)
350℃	0.16	0.18	0.25	0.33	0.38
400℃	0.18	0.20	0.29	0.35	0.40
600℃	0.22	0.24	0.32	0.37	0.42