- PVC —
PVC (Polyvinyl Chloride) is used as an insulation and sheathing material for most of the types of cables available in the market including orange circular cable. The wide usage of this material is because it is the most economical choice available at affordable price. Also, they are resistant to most of the oils and solvents which increases its durability. Also, it is resistant to temperature as high as 90°C and 90°HT and also ultraviolet radiations. The insulation material is quite durable and does not degrade due to sunlight and bad weather conditions unless it has badly tampered.
- Synthetic rubber —
This is also known as EPR or CPE and these insulated sheaths are more durable, resistant and flexible as compared to the PVC variants but they are little costly. The EPR variant is made up of Ethylene Propylene Rubber and it is not resistant to oil but it has good dielectric properties and also excellent voltage grades up to 33kV. As this material is free from halogen it does not emit any sort of corrosive or toxic by-products when burned.
CPE stands for Chlorinated Polyethylene and it is a flexible insulation material which is of heavy duty. But it has a less insulation resistance as compared to EPR. You can use it for low voltage cables such as welding cables as this material has oil resistance.
- X-90 —
This is Cross-linked Polyethylene material with substantial dielectric properties. Just like EPR it is also halogen-free and does not contain heavy metals like lead and antimony. It is more eco-friendly and also reasonably priced and so it is replacing PVC at many places.
Other widely used materials for orange circular cable insulation include ceramifiable, HFS-110, and tape armour. One must choose the insulation material with care according to the intended industry.