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new good lab Pyrex glass tubes (borosilicate) 3.3
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new good Lab Pyrex glass tubes (borosilicate) 3.3
We provide a full range of borosilicate glass tube with good quality and reasonable price.
OD: 3mm-320mm
Main composition:
1) SiO2: 80±0.5%
2) B2O3: 13±0.2%
3) Al2O3: 2.4±0.2%
4) Na2O(+K2O): 4.3±0.2%
Chemical properties:
1) Coefficient of mean linear thermal expansion (20°C/300°C) 3.3±0.1 (10-6K-1)
2) Softening point 820±10°C
3) Density at 20°C 2.23g/cm2
4) Maximum working temperature short term(<10h) 500°C long term(>10h) 450°C
5) water resistance ISO719/DIN12111 HGB1 ISO720 HGA1]
6) Acid resistance ISO1776/DIN12116 1 7) Alkali ISO695/DIN52322 A2
8) Thermal conductivity cal/cm·s°C 0.0028
9) Resistivity lgρ(25°C) 15
10) Thermal shockv resistance ΔT°C 230
11) specific heat capacity(0-100°C)0.195cal/g
new good lab Pyrex glass tubes (borosilicate) 3.3
