Thermal Ceramics Kaocrete 250 C Low Cement Castables

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Thermal Ceramics Kaocrete 250 C Low Cement Castables
Categories:	Ceramic; Oxide; Aluminum Oxide
Material Notes:	Kaocrete 250C is a high-density, high-strength 3200°F (1760°C) low cement castable with excellent thermal shock resistance and good volume stability. Its low iron content and high hotstrengths provide excellent performance in extreme service conditions. General applications would be precast burner blocks and precast shapes. Features: High-strength low cement castables Closely controlled grain sizing Rival the low porosity and low hot load deformation of many dense firebricks Applications: Forge furnace hearths Door jambs Lintels and piers Cartops Rotary kiln nose rings, retainer rings and dams Rotary hearth curbs Walking beam furnace hearth Pusher furnace hearths Skid pipe protection Troughs for molten copper Information provided by Thermal Ceramics Data has not been recently verified. Please contact manufacturer for current information.
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Physical Properties	Original Value	Comments

Density	2.44 - 2.56 g/cc	Fired
Porosity	20 %	Fired at 3000°F; ASTM C20
Deformation	0.50 %	load-25 psi, 1.5 hours at 2640°F; ASTM C16

Mechanical Properties	Original Value	Comments
Modulus of Rupture	1.60 - 2.60 ksi	Dried 18-24 hours at 220°F; ASTM C133
	0.500 - 0.900 ksi @Temperature 1370 °C	ASTM C133
	1.00 - 1.60 ksi @Temperature 1230 °C	ASTM C133
	1.90 - 2.60 ksi @Temperature 1090 °C	ASTM C133
	2.50 - 3.30 ksi @Temperature 816 °C	ASTM C133
	1.20 - 2.10 ksi @Treatment Temp. 816 °C, Time 18000 sec	ASTM C133
	1.70 - 2.80 ksi @Treatment Temp. 1650 °C, Time 18000 sec	ASTM C133
Compressive Strength	41.0 - 90.0 MPa	Fired 5 hours at 1500°F; ASTM C133
	55.0 - 83.0 MPa	Fired 5 hours at 3200°F
	55.0 - 83.0 MPa	Dried for 18-24 hours at 220°F
Abrasion	6.0 - 10	loss, cc`s; Fired 5 hours at 1500°F; ASTM C704

Thermal Properties	Original Value	Comments
Thermal Conductivity	12.0 BTU-in/hr-ft²-°F @Temperature 816 °C	ASTM C417
	12.1 BTU-in/hr-ft²-°F @Temperature 538 °C	ASTM C417
	12.3 BTU-in/hr-ft²-°F @Temperature 1090 °C	ASTM C417
	12.6 BTU-in/hr-ft²-°F @Temperature 260 °C	ASTM C417
Maximum Service Temperature, Air	3200 °F
Shrinkage	0.10 - 0.40 % @Temperature 816 °C, Time 18000 sec	ASTM C113
	2.5 - 3.5 % @Temperature 1760 °C, Time 18000 sec	ASTM C113
	0.00 - 0.20 % @Treatment Temp. 104 °C	Dried 18-24 hours; ASTM C113

Processing Properties	Original Value	Comments
Shelf Life	12.0 Month

Component Elements Properties	Original Value	Comments
Al2O3	69 %
Alkalis	0.20 %
CaO	1.9 %
Fe2O3	1.0 %
SiO2	25 %
TiO2	1.9 %

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