Insulating Fire Bricks

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Type		20 -Grade	23 - Grade	25 - Grade	26 - Grade	28 - Grade
Service Temperature		1230˚C	1250˚C	1350˚C	1430˚C	1510˚C
Bulk Density (gm/cc) max Al₂O₃		0.64 38%	0.77 45%	0.615 50.50%	0.86 50%	0.96 60%
Fe₂O₃		1%	1%	0.88%	1%	1%
CCSMpa		1.20	1.8	2.25	2.2	2.20
Pyrometric Cone [ASTM] No.(min)CCSMpa		27	27	29	32	31
Thermal Conductivity (kcal/m/hr/˚C max)	200˚	0.12	0.16	....	....	....
	400˚C	0.14	0.18	0.18	0.27	0.32
	600˚C	0.16	0.20	0.19	0.30	0.34
	800˚C	0.20	0.23	0.21	0.33	0.35
	1000˚C	0.24	0.26	0.23	0.36	0.38
PLC at Service Temperature(˚C/3 hrs,max.)		0.5	0.5	0.5	0.5	0.5