CeramTec Rubalit® 702 Alumina, 85%

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CeramTec Rubalit® 702 Alumina, 85%
Categories:	Ceramic; Oxide; Aluminum Oxide
Material Notes:	Rubalit® 702 is a high-performance material for the manufacturing of metal-film resistors. With an alumina content of 85%, it provides extreme hardness and high thermal conductivity. Practical applications have shown that Rubalit® 702 is capable of diffusing as much heat as the cap and film. Its extreme hardness necessitates laser trimming of the film material.
Key Words:	Al2O3, aluminum oxide
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Physical Properties	Metric	English	Comments

Density	3.55 g/cc	0.128 lb/in³	DIN EN 623-2 / ASTM-C373 / ASTM-C20
Water Absorption	0.00 %	0.00 %	DIN EN 623-2 / ASTM-C373

Mechanical Properties	Metric	English	Comments
Hardness, Rockwell 45 N	73	73	ASTM-E18
Vickers Microhardness	73	73	HV 0.5; DINV ENV 843-4
Flexural Strength	390 MPa	56600 psi	20 x 40 mm

Electrical Properties	Metric	English	Comments
Volume Resistivity	1.00e+8 ohm-cm @Temperature 600 °C	1.00e+8 ohm-cm @Temperature 1110 °F	ASTM-D1829
	1.00e+10 ohm-cm @Temperature 400 °C	1.00e+10 ohm-cm @Temperature 752 °F	ASTM-D1829
	1.00e+12 ohm-cm @Temperature 200 °C	1.00e+12 ohm-cm @Temperature 392 °F	ASTM-D257
Dielectric Constant	8.0 @Frequency 1e+6 Hz	8.0 @Frequency 1e+6 Hz	IEC 672-1 / ASTM-C150
Dielectric Strength	>= 10.0 kV/mm	>= 254 kV/in	ASTM-D150
Dielectric Loss Index	0.0010 @Frequency 1e+6 Hz	0.0010 @Frequency 1e+6 Hz	IEC 672-1 / ASTM-D149,150

Thermal Properties	Metric	English	Comments
CTE, linear	4.50 µm/m-°C @Temperature 20.0 - 100 °C	2.50 µin/in-°F @Temperature 68.0 - 212 °F	ASTM-C372
	6.20 µm/m-°C @Temperature 20.0 - 300 °C	3.44 µin/in-°F @Temperature 68.0 - 572 °F	ASTM-C372
	7.00 µm/m-°C @Temperature 20.0 - 600 °C	3.89 µin/in-°F @Temperature 68.0 - 1110 °F	ASTM-C372
	7.80 µm/m-°C @Temperature 20.0 - 1000 °C	4.33 µin/in-°F @Temperature 68.0 - 1830 °F	ASTM-C372
Thermal Conductivity	16.0 W/m-K	111 BTU-in/hr-ft²-°F	DIN EN 821-2 / ASTM-C408
Maximum Service Temperature, Air	1350 °C	2460 °F

Component Elements Properties	Metric	English	Comments
Al2O3	85 %	85 %

Descriptive Properties
Color	White
Ra = Arithmetic Mean Roughness Value (µm)	0.2-0.3
Te Value (°C)	850

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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CCERA929 / 107529

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