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Silica ( SiO2 96 )

Material Information

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Common Brand Names:
VYCOR®
 
General Description:  

This flat glass is VYCOR®, and has been developed for its resistance to heat, thermal shock and chemical attack. It can be used at temperatures up to 1200C and is transparent to wavelengths from Ultra-Violet to Infrared. Its main application is use as a sight glass. VYCOR® is three times more resistant to wear than other optical glasses. Electrical properties are similar to those of Fused Quartz. VYCOR® is more resistant to discoloration from exposure to radiation than other optical glasses.
   

Chemical Resistance

Acids - concentrated Good
Acids - dilute Good
Alkalis Fair
Halogens Good
Metals Fair

Electrical Properties

Dielectric constant 3.8
Volume resistivity @25C ( Ohmcm ) 1014

Mechanical Properties

Hardness - Vickers ( kgf mm-2 ) 490
Tensile modulus ( GPa ) 65-75

Physical Properties

Apparent porosity ( % ) 0
Density ( g cm-3 ) 2.18
Refractive index 1.46
Useful optical transmission range 365-2500nm
Water absorption - saturation ( % ) 0

Thermal Properties

Coefficient of thermal expansion @20-1000C ( x10-6 K-1 ) 0.5-0.75
Melting point ( C ) 1715
Specific heat @25C ( J K-1 kg-1 ) 750
Thermal conductivity @20C ( W m-1 K-1 ) 1.2-1.4
Upper continuous use temperature ( C ) 900-1200
All information and technical data are given as a guide only. Although every effort has been made to ensure that the information is correct, no warranty is given as to its completeness or accuracy.
Standard products are available in these forms
Sheet

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