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  • Name: Borosilicate Glass 3.3
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Household electrical appliance (panel for oven and fireplace, microwave tray etc.);

Lighting (spotlight and protective glass for jumbo power of floodlight);

Power regeneration by solar energy (solar cell base plate);

Fine instruments (optical filter);

Semi-conductor technology (LCD disc, display glass);

Medical technique and bio-engineering;

Safety protection (bullet proof glass)

 

Thermal properties

Coefficient of Linear Thermal Expansion (C.T.E.) α (20 - 300 °C)

3.25 x 10-6 K-1 *

Specific heat capacity cp (20 - 100 °C)

0.83 kJ/(kg·K)-1

Thermal conductivity λ (90 °C)

1.2 W/(m·K)-1

* According to ISO 7991.

 Maximum operating temperatures

For short-term usage (< 10 h)

500 °C

For long-term usage (≥ 10 h)

450 °C

 Viscosity Properties

Working Point (104 dPas)

1270 °C

LITTLETON temperature / Softening Point (107,6 dPas)

820 °C

Annealing Point (1013 dPas)

560 °C

Strain Point (1014,5 dPas)

518 °C

Transformation temperature (Tg)

525 °C

 Optical index of refraction

Wavelength λ (nm)

Refraction index n

435.8

1.48015

479.9

1.47676 (nF’)

546.1

1.47311(ne)

589.3

1.47133

643.8

1.46953 (nC’)

656.3

1.46916

 Optical data

Abbe number (ve = (ne – 1) / (nF‘ – nC‘))

65,41

Refraction index (nd (λ587,6 nm))

1,47140

Dispersion (nF – nC)

71,4 x 10-4

Stress-optical coefficient (K)

4,0 x 10-6 mm2 N-1