Momentive Performance Materials Type 214 Fused Quartz Tubing

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Momentive Performance Materials Type 214 Fused Quartz Tubing (discontinued **)
Categories:	Ceramic; Glass; Oxide; Silicon Oxide
Material Notes:	Used for clear fused quartz lamp tubing. GE 214 is a high purity, high transmittance, high temperature material with a low hydroxyl (OH^-) content. It is suitable for a broad range of mercury, halogen, and other quartz lamp applications. Softening point 1683°C. Annealing point 1215°C. Strain point 1120°C. Data provided by GE Quartz. GE Quartz became a part of Momentive Performance Materials in 2006.
Key Words:	Quartz Tubes
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Physical Properties	Original Value	Comments

Density	2.20 g/cc
Viscosity	7.60e+14 cP @Temperature 1100 °C

Mechanical Properties	Original Value	Comments
Knoop Microhardness	570	kg/mm²
Hardness, Mohs	5.5 - 6.0
Tensile Strength, Ultimate	48.0 MPa	design tensile strength
Modulus of Elasticity	72.0 GPa	Young's Modulus
Compressive Strength	>= 1100 MPa	Lower limit of design compressive strength
Poissons Ratio	0.17
Shear Modulus	31.0 GPa

Electrical Properties	Original Value	Comments
Electrical Resistivity	7.00e+7 ohm-cm @Temperature 350 °C
Dielectric Constant	3.75 @Frequency 1e+6 Hz
Dielectric Strength	4.00 kV/mm	1 MHz
	50.0 kV/mm	at 100 Hz
Dissipation Factor	<= 0.00010

Thermal Properties	Original Value	Comments
CTE, linear	0.400 µm/m-°C @Temperature 20.0 °C
	0.450 µm/m-°C @Temperature 1000 °C
	0.600 µm/m-°C @Temperature 500 °C
	0.700 µm/m-°C @Temperature 250 °C
Specific Heat Capacity	0.670 J/g-°C @Temperature 0.000 - 50.0 °C
Thermal Conductivity	1.40 W/m-K
Softening Point	1683 °C
Annealing Point	1215 °C
Strain Point	1120 °C

Optical Properties	Original Value	Comments
Refractive Index	1.4585
Transmission, Visible	92 %	Entire visible spectrum; 1 mm thickness (includes surface reflection losses)
IR Transmittance	93 % @Wavelength 1000 - 3000 nm, Thickness 1.00 mm	Cutoff is at 5000 nm; (includes surface reflection losses).
UV Transmittance	80 % @Wavelength 190 - 290 nm, Thickness 1.00 mm	Cutoff is at 160 nm; (includes surface reflection losses).

Descriptive Properties
Color	Clear

**
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