Sell high borosilicate glass tube

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hysical Data:

No. Physics Performance Numerical Value Unit
1 Medium coefficient of linear expansion (Alpha)20/300 acc. To DIN 52328 3.3 0.1 10-6 K-1
2 Transformation Temperature 525 15 0
3 Viscosity temperatures (dPa7s) :
1014.7 510 10 0
1013.2 upper annealing temperature 560 10 0
107.5 softening point 820 10 0
104 working temperature 1260 20 0
4 Maximum short-time working temperature 500 0
5 200 Density ρ 2.23 0.02 g/cm3
6 Modulus of elasticity E 64 103 N/mm2
7 Poissons ratio5 0.20 1
8 Thermal conductivityλ w(200-1000) 1.2 W/m2K
9 Temperature for the specific electrical resistance of 108(Ohms)7cm(DIN52326) tk 100 250 0
10 Electrical volume resistance logarithm((Ohms)7cm)
At 2500 8
At 3500 6.5
11 Dielectric Properties (1MHz,250)
Dielectric figureε 4.6 1
Dielectric loss factor tanδ 37 10-4
12 Refractive index(λ =587.6nm) nd 1.473 1
13 Stress-optical constant(DIN52314) K 4.0 10-6mm2/N

Chemical Data

Hydrolytic resistance at 98 0 ISO719-HGB 1
Hydrolytic resistance at 121 0 ISO720-HGA 1
Acid resistance class ISO1776-First Class