B37 Graded Seal Glass Rod

B37 Graded Seal Glass Rod

Available Standard Sizes

  • 2mm - 4mm

Nominal length 1m

For custom sizes please contact us

Glass Composition

  • SiO2 76.3
  • B2O3 15.6
  • Al2O3 2.7
  • K2O 1.3
  • BaO 0.3
  • Na2O 3.8
  • Fe2O3 0.01

Coefficient of Expansion

  • 36.5 to 38.5 x 10-7 (temperature range 50° to 400°C)
    (control range measured on annealed glass)

Other Properties

  • Strain point 490°C
  • Annealing point 560°C
  • Softening point 770°C
  • Log _ 250 8.7
  • Log _ 350 7.1
  • Tk100 290°C
  • Density 2.25 (at 4°C)

All values are nominal except for specified expansion range.

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