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- Contact Person : Mr. jia jeff
- Company Name : Beijing Kaixingda Industry Technology Development Co., Ltd.
- Tel : 86-10-67562712
- Fax : 86-10-67562693
- Address : Beijing,beijing,NO.15 MAJIAPU,FENGTAI DISTRICT
- Country/Region : China
- Zip : 100068
borosilicate glass tubes (guaranteed quality)
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borosilicate glass tubes (guaranteed quality)
OD: 3-320mm, and the tubes of 37, 47, 58, 70 for the solar water heater.
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
borosilicate glass tubes (guaranteed quality)
