Specifications

Insulating firebrick
Series: JM23,,JM25, JM26, JM28, JM30, JM32
Temperature classes: 1260, 1350, 1430, 1540, 1650, 1760

Insulating fire bricks are soft and light in weight. They can be easily cut by handheld hack saw or any other hand tool like chisel or even drill bit. Color of insulating bricks varies but usually they come in shades from light brown to white. In refractory air is the best insulation and this is why insulating firebricks have excellent insulating properties. Their body is made of tiny air spaces similar to honeycomb effect.

 

Main application: Backup insulation for carbon baking furnaces, Backup insulation in aluminum electrolytic cells, Electrical kilns for industrial and hobby use, Backup insulation for blast furnace stove linings, Linings for carbonizing furnaces, Forge furnace lings, Heat transfer linings.

 

 

Technical Data Sheet
		JM-20	JM-23	JM-25	JM-26	JM-28	JM-30	JM-32
Classification Temperature (‘C)		1100	1260	1350	1430	1540	1650	1760
Bulk Density (g/cm3)		0.52	0.60	0.80	0.80	0.90	1.03	1.25
Cold Crushing Strength (Mpa)		0.8	1.2	2.0	2.0	2.6	2.8	3.4
Modulus of Rupture (Mpa)		0.6	0.9	1.2	1.5	1.6	1.7	2.0
Permanent Liner Change (%)        ‘C x hrs		0	0	-0.5	-0.5	-0.8	-0.9	-0.9
		1065x24	1230x24	1350x24	1400x24	1510x24	1620x24	1730x24
Thermal Conductivity	400’C	0.17	0.17	0.24	0.24	0.30	0.40	0.49
	600’C	0.19	0.19	0.28	0.27	0.32	0.42	0.50
	800’C	0.22	0.22	0.32	0.30	0.35	0.44	0.51
	1000’C	0.24	0.25	0.37	0.32	0.38	0.45	0.53
	1200’C	--	--	--	0.35	0.39	0.47	0.55
Chemical Analysis
Al2O3 (%)		45	45	50	55	65	72	76
Fe2O3 (%)		0.9	0.9	0.8	0.8	0.5	0.4	0.3
SiO2 (%)		50	50	45	42	32	26	22
CaO + MgO (%)		0.5	0.7	0.6	0.3	0.2	0.3	0.2
K2O + Na2O (%)		1.3	1.3	1.0	1.0	0.8	0.2	0.1