1. Optical Properties The visible light transmittance of insulated glass systems is normally in the range of 70-80% and the visible light reflectance is in the range of 10-48%. 2. Thermal Properties The U-value is effectively lowered by double glazing units and can be further reduced by filling of inert gases like argon gas. 3. Acoustical Insulation Insulated glass has a good soundproof function, can reduce noise by more than 30 dB. 4. Condensation The dew point of Eliter insulating glass is below -65 ºC which guarantees no condensation formation under normal applications. 5. Sealing The aluminum spacer is automatically curved and formed with the fewest joints and dual seals are applied, which ensures excellent sealing characteristics and a long application lifetime.