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 can 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