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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.

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