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	Metric	English	Comments

Density	2.44 - 2.56 g/cc	0.0882 - 0.0925 lb/in³	Fired
Porosity	20 %	20 %	Fired at 3000°F; ASTM C20
Deformation	0.50 %	0.50 %	load-25 psi, 1.5 hours at 2640°F; ASTM C16

Mechanical Properties	Metric	English	Comments
Modulus of Rupture	0.0110 - 0.0179 GPa	1.60 - 2.60 ksi	Dried 18-24 hours at 220°F; ASTM C133
	0.00345 - 0.00621 GPa @Temperature 1370 °C	0.500 - 0.900 ksi @Temperature 2500 °F	ASTM C133
	0.00689 - 0.0110 GPa @Temperature 1230 °C	1.00 - 1.60 ksi @Temperature 2250 °F	ASTM C133
	0.0131 - 0.0179 GPa @Temperature 1090 °C	1.90 - 2.60 ksi @Temperature 2000 °F	ASTM C133
	0.0172 - 0.0228 GPa @Temperature 816 °C	2.50 - 3.30 ksi @Temperature 1500 °F	ASTM C133
	0.00827 - 0.0145 GPa @Treatment Temp. 816 °C, Time 18000 sec	1.20 - 2.10 ksi @Treatment Temp. 1500 °F, Time 5.00 hour	ASTM C133
	0.0117 - 0.0193 GPa @Treatment Temp. 1650 °C, Time 18000 sec	1.70 - 2.80 ksi @Treatment Temp. 3000 °F, Time 5.00 hour	ASTM C133
Compressive Strength	41.0 - 90.0 MPa	5950 - 13100 psi	Fired 5 hours at 1500°F; ASTM C133
	55.0 - 83.0 MPa	7980 - 12000 psi	Fired 5 hours at 3200°F
	55.0 - 83.0 MPa	7980 - 12000 psi	Dried for 18-24 hours at 220°F
Abrasion	6.0 - 10	6.0 - 10	loss, cc`s; Fired 5 hours at 1500°F; ASTM C704

Thermal Properties	Metric	English	Comments
Thermal Conductivity	1.73 W/m-K @Temperature 816 °C	12.0 BTU-in/hr-ft²-°F @Temperature 1500 °F	ASTM C417
	1.74 W/m-K @Temperature 538 °C	12.1 BTU-in/hr-ft²-°F @Temperature 1000 °F	ASTM C417
	1.77 W/m-K @Temperature 1090 °C	12.3 BTU-in/hr-ft²-°F @Temperature 2000 °F	ASTM C417
	1.82 W/m-K @Temperature 260 °C	12.6 BTU-in/hr-ft²-°F @Temperature 500 °F	ASTM C417
Maximum Service Temperature, Air	1760 °C	3200 °F
Shrinkage	0.10 - 0.40 % @Temperature 816 °C, Time 18000 sec	0.10 - 0.40 % @Temperature 1500 °F, Time 5.00 hour	ASTM C113
	2.5 - 3.5 % @Temperature 1760 °C, Time 18000 sec	2.5 - 3.5 % @Temperature 3200 °F, Time 5.00 hour	ASTM C113
	0.00 - 0.20 % @Treatment Temp. 104 °C	0.00 - 0.20 % @Treatment Temp. 220 °F	Dried 18-24 hours; ASTM C113

Processing Properties	Metric	English	Comments
Shelf Life	12.0 Month	12.0 Month

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

Some of the values displayed above may have been converted from their original units and/or rounded in order to display the information in a consistent format. Users requiring more precise data for scientific or engineering calculations can click on the property value to see the original value as well as raw conversions to equivalent units. We advise that you only use the original value or one of its raw conversions in your calculations to minimize rounding error. We also ask that you refer to MatWeb's terms of use regarding this information. Click here to view all the property values for this datasheet as they were originally entered into MatWeb.

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