The growth of high voltage applications such as generation, transmission and distribution has raised demands on the reliability and high performance of the insulating material to deal with more dynamic and unstable operating conditions. It is because insulation is the main factor deciding the performance of the electrical appliances. Normally mineral oil or vegetable oil was used for regular electrical applications in the past era. But it did not meet the requirements for extra high voltage applications such as thermal withstanding ability, aging characteristics, and handling of high voltage levels. Also, it is not having biodegradability and its availability is diminishing day by day. The broader