Pilkington Optitherm™ S1 Plus is a high performance off-line coated low-e product, specially designed for Insulating Glass Units. It offers ultra low emissivity and achieving a Ug-value of only 1.0 W/m²K when incorporated in a double glazed IGU. 

Pilkington Optitherm™ S1 Plus is a single stock, low-e product and as such has the same performance in both annealed and toughened format. Pilkington Optitherm™ S1 Plus can also be supplied in laminated form. It combines superior light transmittance with a highly neutral colour and is the ultimate in thermal insulation.