Schott ZERODUR® Glass Ceramic

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Schott ZERODUR® Glass Ceramic
Categories:	Ceramic; Glass; Optical
Material Notes:	ZERODUR® is a glass ceramic with an extremely low thermal expansion for demanding applications in which geometrical shape and distance changes must kept smallest possible under temperature variations. The key properties of ZERODUR® are: Extremely low coefficient of thermal expansion (CTE) for a wide temperature range Excellent CTE homogeneity throughout the total volume Very low content of imperfections Wide range of precise geometrical Shapes Extremely smooth surface with residual roughness below 1 nm Uses: Stages and mirrors for lithography equipment Mirror substrates for segmented and monolithic large astronomical telescopes Ultra light weighted mirror blanks High precision mechanical parts, e.g. ring laser gyroscope bodies Reference standards for precision measurement technology and comet probes Information provided by SCHOTT.
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Physical Properties	Original Value	Comments

Density	2.53 g/cc

Mechanical Properties	Original Value	Comments
Hardness, Knoop	620	0.1/20
Modulus of Elasticity	90.3 GPa
Poissons Ratio	0.24
Shear Modulus	36.4 GPa	Calculated

Thermal Properties	Original Value	Comments
CTE, linear	0.000 - 0.00700 µm/m-°C @Temperature 0.000 - 50.0 °C	EXTREME
	0.000 - 0.0100 µm/m-°C @Temperature 0.000 - 50.0 °C	SPECIAL
	0.000 - 0.0200 µm/m-°C @Temperature 0.000 - 50.0 °C	class 0
	0.0100 - 0.0300 µm/m-°C @Temperature 0.000 - 50.0 °C	Homogeneity
	0.000 - 0.0500 µm/m-°C @Temperature 0.000 - 50.0 °C	class 1
	0.000 - 0.100 µm/m-°C @Temperature 0.000 - 50.0 °C	class 2
Specific Heat Capacity	0.800 J/g-°C
Thermal Conductivity	1.45 W/m-K
Maximum Service Temperature, Air	600 °C

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CSGT9948 / 183201

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