Momentive Performance Materials Type 219 Fused Quartz Tubing

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Momentive Performance Materials Type 219 Fused Quartz Tubing (discontinued **)
Categories:	Ceramic; Glass; Oxide; Silicon Oxide
Material Notes:	Known as "Ozone-Free" or "Germicidal" quartz tubing. Transmits UV-A and UV-B while blocking the deep, high energy wavelengths that cause ozone generation and pose the greatest exposure risks. Transmits the 253.7 nm mercury emission very efficiently, making it an ideal material for disinfecting applications and various other UV treatments. Softening point 1660°C. Annealing point 1204°C. Strain point 1106°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	Metric	English	Comments

Density	2.21 g/cc	0.0798 lb/in³
Viscosity	5.60e+14 cP @Temperature 1100 °C	5.60e+14 cP @Temperature 2010 °F

Mechanical Properties	Metric	English	Comments
Knoop Microhardness	570	570	kg/mm²
Hardness, Mohs	5.5 - 6.5	5.5 - 6.5	(Type 214)
Modulus of Elasticity	75.0 GPa	10900 ksi	Young's Modulus
Compressive Strength	94.0 MPa	13600 psi	design compressive strength

Electrical Properties	Metric	English	Comments
Electrical Resistivity	2.50e+10 ohm-cm @Temperature 350 °C	2.50e+10 ohm-cm @Temperature 662 °F
Dielectric Constant	5.8 @Frequency 1e+6 Hz	5.8 @Frequency 1e+6 Hz

Thermal Properties	Metric	English	Comments
CTE, linear	0.400 µm/m-°C @Temperature 20.0 °C	0.222 µin/in-°F @Temperature 68.0 °F
	0.450 µm/m-°C @Temperature 1000 °C	0.250 µin/in-°F @Temperature 1830 °F
	0.600 µm/m-°C @Temperature 500 °C	0.333 µin/in-°F @Temperature 932 °F
	0.700 µm/m-°C @Temperature 250 °C	0.389 µin/in-°F @Temperature 482 °F
Specific Heat Capacity	0.700 J/g-°C @Temperature 0.000 - 50.0 °C	0.167 BTU/lb-°F @Temperature 32.0 - 122 °F
Thermal Conductivity	1.40 W/m-K	9.72 BTU-in/hr-ft²-°F
Softening Point	1660 °C	3020 °F
Annealing Point	1204 °C	2199 °F
Strain Point	1106 °C	2023 °F

Optical Properties	Metric	English	Comments
Refractive Index	1.456	1.456
Transmission, Visible	92 %	92 %	Entire visible spectrum; 1 mm thickness (includes surface reflection losses)
IR Transmittance	93 % @Wavelength <=2500 nm, Thickness 1.00 mm	93 % @Wavelength <=2500 nm, Thickness 0.0394 in	Very wavelength dependent - drop begins above 2500 nm and cutoff almost complete at 4200 nm; (includes surface reflection losses)
UV Transmittance	0.00 % @Wavelength <=220 nm, Thickness 1.00 mm	0.00 % @Wavelength <=220 nm, Thickness 0.0394 in	Highly wavelength dependent - cutoff below 220 nm; (includes surface reflection losses)

Descriptive Properties
Color	Clear

**
Materials flagged as discontinued () are no longer part of the manufacturer’s standard product line according to our latest information. These materials may be available by special order, in distribution inventory, or reinstated as an active product. Data sheets from materials that are no longer available remain in MatWeb to assist users in finding replacement materials.

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CGEQ19 / 895

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