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	Original Value	Comments

Density	2.24 - 3.36 g/cc
Porosity	0.50 - 1.5 %

Mechanical Properties	Original Value	Comments
Hardness, Shore H	74 - 97
Hardness, Mohs	5.26 - 6.47
Tensile Strength, Ultimate	5.00 - 20.0 MPa
Modulus of Elasticity	13.0 - 35.0 GPa
Modulus of Rupture	0.00830 - 0.0214 GPa
Flexural Strength	10.0 - 20.0 MPa
Transverse Strength	8.00 - 21.0 MPa
Compressive Strength	22000 - 36000 psi
Impact Toughness	3.70 - 8.40 in/in²

Electrical Properties	Original Value	Comments
Electrical Resistivity	10000 - 1.00e+10 ohm-cm

Thermal Properties	Original Value	Comments
CTE, linear	1.30 - 4.40 µm/m-°C @Temperature 20.0 °C
Specific Heat Capacity	0.736 - 0.816 J/g-°C
Thermal Conductivity	2.10 - 3.40 W/m-K

References for this datasheet.

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BMIN046 / 195

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