Optitherm® low-e glass

A clear and insulating soft coat low e glass ideal for residential windows

A value-for-money solution for residential windows, Optitherm is a clear low-e glass product that has exceptionally high clarity and insulation properties. It is designed to allow the natural light and sun to enter the building whilst providing natural insulation.

In addition to blocking the negative aspects of the sun during the summer, Optitherm also reflects escaping heat back into the room during winter. This positive affects occupants of the building as there is far less reliance on artificial light and cooling/heating, not to mention the associated energy savings and environmental benefits.

Optitherm comes double glazed in an Insulated Glass Unit (IGU) and achieves an exceptional Visible Light Transmission (VLT) of 78% whilst maintaining a low Solar Heat Gain Coefficient (SHGC) of 0.63 and a U-Value of 1.38.


Available on Clear


Commercial or residential windows

Green Star projects

Performance Table

Typical low-e IGU 6mm Clear /12mm Argon / 6mm clear* 4mm Optitherm Clear / 12mm Argon / 4mm clear
Light Transmission 73% 80%
Reflectance Exterior 17% 12%
SHGC 0.67 0.62
U-Value 1.6 1.66

*Figures compare a typical 6mm low-e IGU with 4mm Optitherm

Performance figures table