GS20 Graded Seal Glass Rod

GS20 Graded Seal Glass Rod

Available Standard Sizes

  • 2mm - 4mm

Nominal length 1m

For custom sizes please contact us

Glass Composition

  • SiO2 81.2
  • B2O3 10.2
  • Al2O3 5.2
  • BaO 2.0
  • K2O 0.3
  • CaO 1.0
  • Fe2O3 0.01

Coefficient of Expansion

  • 17.0 to 19.0 x 10-7 (temperature range 50o to 400°C)
    (control range measured on unannealed glass)

Other Properties

  • Strain point 645°C
  • Annealing point 730°C
  • Softening point 1190°C
  • Log _ 250 10.1
  • Log _ 350 8.5
  • Tk100 385°C

All values are nominal except for specified expansion range.

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