For applications requiring an optimised Ug value we introduce a new concept for the ultimate in thermal efficiency.
By combining Pilkington K Glass™ OW on Surface 4* of an IGU with Pilkington Optitherm™ S1 Plus ultra low-emissivity glass on Surface 2** a very low Ug-value of 0.9 W/m²K can be achieved. Put simply you get triple performance with only two panes of glass!
Pilkington K Glass™ OW has always been the ideal choice for clarity. As an advanced form of the original Pilkington K Glass™ it provides better light transmission and allows in more free heat from the sun to enable householders to reduce energy usage and save money on heating bills.
* the exterior surface of the inside pane
** the interior surface of the outside pane