Technical Information
Technical Information
Physical Properties
Borosilicate Glass 3.3 is versatile both in universal resistence to corrosion due to corrosive chemicals and has very low thermal expansion coefficient.Hence, no need for expensive measures for controlling thermal expansions due to variation in temperature. The major physical properties are
| Properties | Values |
|---|---|
| Mean thermal conductivity | 1.2W/mK |
| Density | r = (2.23 + 0.02) g/cm2 |
| Mean specific Heat | Capacity Cp = 0.98KJ/Kg-K |
| Modulus of Elasticity | E = 64KN/mm2 |
Chemical Properties
| Component | % by weight |
|---|---|
| SiO2 | 80.6 |
| B2O3 | 12.5 |
| Na2O | 4.2 |
| Al2O3 | 2.2 |
| Remaining | 0.5 |
Resistivity
Borosilicate Glass 3.3 is reistant to almost every existing chemicals excluding HF Hydrofluoric acid H3PO4 Phosphoric acid and strong Caustic solutions. Concentrated form of Hydrofluroic acid effects largely on glass while normal Phosphoric acid and Caustic solutions has no or less effect.
Mechanical Properties
The compressive strength is high in Borosilicate Glass 3.3, while the tensile strength is low due to which it can easily withstand pressure & the glass process plant are supported from the lowest point.
| Properties | Values |
|---|---|
| Permissible tensile & bending stress | 6 N/mm2 |
| Permissible comprehensive stress | 100 N mm-2 |
| Poisson’s ratio | 0.2 |
Optical Properties
Due to its versatile properties Borosilicate Glass 3.3 shows no absorption or adsorption due to which it remains clear & colorless & hence a better see through medium is obtained. Thus accordingly process like chlorination , sulphonation & other miscellaneous process can be carried out easily as there no interference of light in the process from glass.
Permissive Pressure
As in all kind of material of construction used in chemical process plants, the permissive pressure for Borosilicate Glass 3.3 depends upon,
- Internal diameter of glass
- Working temperature
In whole process plant there are different kind of glass and non glass components hence there working pressure is always calculated by there running in vacuum conditions.
Permissive Temperature
All Borosilicate Glass 3.3 components can be operated safely till the temperature range of (0-200) oC provided that there is no shock both thermally and physically. Morever the working of equipments also depends upon the non glass fittings like PTFE components.
Thermal Shock
Sudden change in temperature or pressure leads to a shock condition for glass, i.e tremendous strain is generated in glass which has a adverse effect on the operating pressure of glass equipment. To overcome such effect, a value 120K of maximum permissive thermal shock is set for general glass equipments.
Glass Buttress End
All the glass equipments shown in our catalogue have standard Flat Buttress End as, which can be changed accordingly. The major dimensions of Buttress End are mentioned in table below.
| Nominal bore DN mm |
Buttress end diameter D mm |
Tolerances (±) |
|---|---|---|
| 25 | 42.5 | (+) 0.0, (-) 1.5 |
| 40 | 57.5 | (+) 0.0, (-) 1.5 |
| 50 | 70 | (+) 0.0, (-) 1.5 |
| 80 | 99.5 | (+) 0.0, (-) 1.5 |
| 100 | 133 | (+) 0.0, (-) 2.0 |
| 150 | 185 | (+) 0.0, (-) 2.0 |
| 200 | 232 | (+) 0.0, (-) 2.0 |
| 225 | 259 | (+) 0.0, (-) 2.0 |
| 300 | 340 | (+) 0.0, (-) 3.0 |
| 400 | 464 | (+) 0.0, (-) 4.0 |
| 450 | 525 | (+) 0.0, (-) 4.0 |
| 600 | 684 | (+) 0.0, (-) 6.0 |
Repairs
Repairing of any damaged glass equipment is possible. Generally the cost involved is less compared to original cost but sometimes in case of certain damages it becomes uneconomical. Below mentioned are some points which clarify the cost of repairing.