Electrical insulation papers are paper types that are used in many applications due to pure cellulose having outstanding electrical properties. Cellulose is a good insulator and is also polar, having a dielectric constant significantly greater than one. The use of paper board as electrical insulation paper started in the early-mid 20th century. Since the need for high voltage electrical transformers, there has been a need for an insulator material that could withstand the high electrical and physical stresses experienced around a core and windings.
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