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Additional Info on our borosilicate glass tubing used for Lantern and Union Sight Glasses | 
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Coefficient of mean linear thermal expansion α20/300°C |
3.3 · 10-6 · K-1 | ||
| Maximum short-time working temperature | 500°C | ||
| Density (at 25°C) | 2.23g/cm | ||
| Modulus of elasticity (Young's modulus) E | 63 ● 103 N/mm2 | ||
| Poisson's ratio µ | 0,20 | ||
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Temperature for the specific electrical resistance of
108 Ωcm (DIN 52326) tk100 |
250°C | ||
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Logarithm of the electric volume resistivity At 250°C At 350°C |
8 6.5 |
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Dielectric properties (1MHz, 25°C) Dielectric constant (permittivity) Dielectric loss factor tan δ |
4.6 37 ● 10-4 |
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| Refraction index (=587.6nm) nd | 1.473 | ||
| Stress-optical coefficient (DIN 52314) K | 4.0 ● 10-6 mm2/N | ||
| Hydrolytic class (DIN ISO 719) | HGB 1 | ||
| Acid class (DIN 12 116) | S 1 | ||
| Alkali class (DIN ISO 965) | A 2 | ||
| Qualified for food | Yes | ||
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