Gneiss

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Gneiss
Categories:	Ceramic
Material Notes:	Metamorphic rock, resembling granite in appearance. The grains in gneiss have grown into a parallel structure; its compressive strength is higher perpendicular to the grain axes than parallel to this axis. Property values are typical of Gneiss used in construction. Actual property values will vary from sample to sample.
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Physical Properties	Metric	English	Comments

Density	2.24 - 3.36 g/cc	0.0809 - 0.121 lb/in³
Porosity	0.50 - 1.5 %	0.50 - 1.5 %

Mechanical Properties	Metric	English	Comments
Hardness, Shore H	74 - 97	74 - 97
Hardness, Mohs	5.26 - 6.47	5.26 - 6.47
Tensile Strength, Ultimate	5.00 - 20.0 MPa	725 - 2900 psi
Modulus of Elasticity	13.0 - 35.0 GPa	1890 - 5080 ksi
Modulus of Rupture	0.00830 - 0.0214 GPa	1.20 - 3.10 ksi
Flexural Strength	10.0 - 20.0 MPa	1450 - 2900 psi
Transverse Strength	8.00 - 21.0 MPa	1160 - 3050 psi
Compressive Strength	152 - 248 MPa	22000 - 36000 psi
Impact Toughness	1.46 - 3.31 cm/cm²	3.70 - 8.40 in/in²

Electrical Properties	Metric	English	Comments
Electrical Resistivity	10000 - 1.00e+10 ohm-cm	10000 - 1.00e+10 ohm-cm

Thermal Properties	Metric	English	Comments
CTE, linear	1.30 - 4.40 µm/m-°C @Temperature 20.0 °C	0.722 - 2.44 µin/in-°F @Temperature 68.0 °F
Specific Heat Capacity	0.736 - 0.816 J/g-°C	0.176 - 0.195 BTU/lb-°F
Thermal Conductivity	2.10 - 3.40 W/m-K	14.6 - 23.6 BTU-in/hr-ft²-°F

References for this datasheet.

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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BMIN046 / 195

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