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Double Glazing - Low-E Coatings

Hard coated Low-E productsDevelopments in glazing technology have produced special glass which can control heat loss through the glazing. Low Emissivity glass (Low E-Glass) can reflect 40% - 70% of the heat that is normally transmitted through the glass.

Low-E coatings are microscopic metallic oxide layers deposited on a double glazed window’s internal surface to reduce radiant heat flow.

Heat is lost through double glazing through thermal radiation, from warm window surfaces to cooler ones. Coating the window glazing surface with a Low-E material reflects some of this radiant heat, lowering the total heat loss through the window.

Low-E coatings can be applied to one or more surfaces of double glazing. When used on the inside, they can help to retain radiant heat inside the room.

Low-E coatings are transparent to visible light, and opaque to Infrared radiation. Different types of Low-E coatings grades allow for high, moderate or low solar gain.

Heat Efficient Windows – All Year Round

  • In winter, radiant heat from inside the room can be reflected back inside, thus keeping heat inside in the winter.
  • In summer, infrared radiation from the sun is reflected away, keeping the room cooler.

Hard / Soft Coated Glass

Hard coated Low-E products, such as Pilkington K, are popular in the UK. They can have a slight champagne tint. Also very effective results are seen with soft coated glass such as Saint Gobain’s Planitherm. This product is clear with no visible tint.

Low-E glass is now a standard requirement under Building Regs for many homes in the UK.

 

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