The dielectric materials may be classified as solid, liquid and gas dielectrics.
| Solid form |
In solid form they may be polymeric such as nylon, pvc, rubber, backlite, asbestos and wool or may belong to the ceramic family such as glass, silica, mica, porcelain, etc. |
| Liquid form form |
In liquid form they may be mineral insulating oils, synthetic insulating oils, etc. |
| Gaseous form |
In gaseous form they may be air, nitrogen, sulphur hexafluoride, inert gases etc. |
The dielectrics can also be classified as active and passive dielectrics based on their applications.
| S.No |
Active Dielectrics |
Passive Dielectrics |
| 1. |
When dielectric is subjected to external electric field, if the dielectric actively accept the electricity, then they are termed as active dielectrics. |
These dielectrics are also called insulating materials. As the name itself suggest that it will act as an insulator, conducting will not take place through this dielectrics. |
| 2. |
Thus active dielectrics are the dielectrics which can easily adapt itself to store the electrical energy in it. |
Thus passive dielectrics are the dielectrics which restricts the flow of current in it. |
| 3. |
Examples: Piezo-electric materials, Ferro-electric materials etc., |
Example: All insulating materials such as glass, mica, etc., |
