Electrical insulation papers are paper types that are used as electrical insulation in many applications due to pure cellulose having outstanding electrical properties. Cellulose is a good isolator and is also polar, having a dielectric constant significantly greater than one.[1] Electrical paper products are classified by their thickness, with tissue considered papers less than 1.5 mils thickness, and board considered more than 20 mils thickness

 

There are many kinds of paper, such as DMD,DM, Polyester film

Also there are insulation paper with different class, such as class E, F, B