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Corning® 7980 Fused Silica

 

Description:
Corning® 7980 is a very pure, non-crystalline silica glass. It features very low thermal expansion and excellent optical qualities, including very high transmission in the UV spectrum.

 

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Features: Applications:
  • Excellent optical properties
  • Low thermal expansion
  • High UV transmission
  • Optical windows
  • High temperature view ports

 

Physical Properties:

Mechanical:
  • Density (25°C) ρ
  • Young’s Modulus Ε
  • Poisson’s Ratio μ
  • Knoop Hardness HK0.1/20
  • Shear Modulus
2.201 g/cm3
72.7 GPa
0.16
522 kg/mm2
31.4 GPa
137.4 lb/ft3
10.5 Mpsi
0.16

 

4.55 Mpsi

 

Viscosity:

  • Softening Point (107.6 poises)
  • Annealing Point (1013 poises)
  • Strain Point (1014.5 poises)
1585 °C
1042 °C
893 °C
2885 °F
1908 °F
1639 °F

 

Thermal Expansion:

  • 0 – 200 °C (32 – 392 °F)
5.7 x 10-7/°C

 

Optical:

  • Index of Refraction @ 589.3nm
1.45840  

 

Electrical:

  • Log10 Volume Resistivity:
(250°C, 482°F) 11.8 ohm*cm

 

Dimensions:

  • Thicknesses: 1.6mm
  • Sizes: Up to 6.5” x 6.5” (165.1 x 165.1”)

 

Corning 7980

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