Due to get a higher energy efficient levels, glass could be coated on one of their surfaces. This coating could be applied in two different operations: during float glass producing as Online coating or after process as Offline coating.
Online coating is applied chemically during float glass producing at temperature 600 and more. Glass moving speed is 10 - 15 m/min. This kind of coating provides hard and durable glass. It is also called as hard coated low-e glass.
Offline coating is applied phsyically after float glass process in vacuumed environment. Glass moving speed is 2 - 6 m/min. This coating provides high performance and high flexibility glass. It is also called as soft coated low-e glass.