This type of material( Glass) has high resistance to electricity and has low factor for thermal expansion. It has higher dielectric strength compared to the porcelain due to its hardening process which is used for manufacturing them. It is also important as the insulating properties of glass cannot be affected by the external temperatures. This is because the tensile strength of the glass material prevents it from heating up in case of high temperatures.
Another advantage of the glass material is that glass has longer service life than porcelain. Glass insulators are cheaper than the porcelain and the polymer insulators.
