‘Supertek’ Laboratory Glassware is made of Heat resistant Borosilicate 3.3 Glass, unless otherwise specified. It is suitable for use in laboratories as well as industrial applications.
CHEMICAL COMPOSITION
| |
Approx % by weight |
SiO2 |
81 |
B2O3 |
13 |
Na2O/K2O |
4 |
Al2O3 |
2 |
THERMAL PROPERTIES
The typical thermal properties of ‘Supertek’ glassware are given below: |
Coefficient of Linear Expansion
|
32.5 x 10-7/°C |
Strain Point |
515 °C |
Annealing Point |
565 °C |
Softening Point |
820 °C |
Specific Heat |
0.2 |
Thermal Conductivity |
0.0027 |
CHEMICAL DURABILITY
‘Supertek’ Glassware is resistant to water, neutral and acid solutions, concentrated acids and their mixtures as well as to chlorine, bromine, iodine and organic matters. Only hydrofluoric acid, very hot phosphoric acid and alkaline solutions increasingly attack the glass surface with rising concentration and temperature. |
