Pilkington Optitherm™ S3 is a neutral, off-line coated, low emissivity glass with a Ug-value of 1.1 W/m²K when incorporated in a standard Insulating Glass Unit (IGU). It is one of the market's leading super neutral low-emissivity glass products due to its very high light transmittance, low light reflectance and high level of colour neutrality making it ideal for large glazing areas with demanding design.