Disc insulators are made of porcelain ,glass or composite materials with upper and lower metal fittings with glue. The contact surface between the end face of the porcelain or polymer pieces and the metal accessory is elastically padded, and the plastic parts of the porcelain part are respectively sanded, knurled, grooved and the like to ensure mechanical strength, prevent loosening and twisting. The surface of the porcelain piece is evenly white glazed, and the surface of the metal accessory is painted with ash enamel.

The disc insualtors usually used for overhead transmission and distribution line constructions .There are usually many pieces disc insulators connected together to add the greepage distance.

There are usually two types of disc insulators, one is suspension disc insulator and the other is pin type disc insulator.