External Three Layer Polyethylene / Polypropylene Coating can coat pipes ranging from 1 Inches - 4 Inches outer diameter. The Polypropylene Coating can also coat pipes ranging from 4 Inches – 48 Inches OD. The Polypropylene Coating is formulated in such a way that it ensures long lasting service. The External Three Layer Polyethylene / Polypropylene Coating is required for applications in various industries.