Borosilicate Glass 3.3 Tube No.
Physics performance
Numerical #118alue
Unit
1
coefficient of mean linear thermal expansion(20-300 )
3.3±0.1
10-6K-1
2
Transformation Temperature
525±15
3
Softening point
820±10
4
Working point
1260±20
5
Density at 20
2.23±0.2
g/cm2
6
Mean thermal conductivity(20-100)
1.2
W/m.K
7
Refractive Index
0.92
l
Chemical Composition in approximate weight %( main components)
Item .
SiO2
B2O3
AL2O3
Na2O +K2O
%
81
13
2
3.08
Chemical Data:
Hydrolytic resistance at 98 ISO719-HGB 1
Hydrolytic resistance at 121 ISO720-HGB 1
water resistance Grade 1 Test method: ISO1776
Acid resistant Class Grade 1 Test method: ISO1776
Product Feature
Borosilicate Glass 3.3 Tube
Produced by the international standards strictly
Borosilicate Glass 3.3 Tube
Produced by the international standards strictly