Polymer insulators are made from resins, a relatively uncommon material for insulator compared with porcelain. With high electrical resistance, it can moderate the voltage for stable operation. Polymer insulator being a common product applied in electronic device, it can moderate the voltage for stable operation with high electrical resistance.
An electrical insulator is a material whose internal electric charges do not flow freely, and which therefore does not conduct an electric current, under the influence of an electric field. A perfect insulator does not exist, but some materials such as glass, paper and Teflon, which have high resistivity, are very good electrical insulators. A much larger class of materials, even though they may have lower bulk resistivity, are still good enough to insulate electrical wiring and cables. Examples include rubber-like polymers and most plastics. Such materials can serve as practical and safe insulators for low to moderate voltages (hundreds, or even thousands, of volts).