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| Energy Efficient Glass |
Some manufacturers produce float glass with a special thin coating on one side which allows the suns energy to pass through in one direction while reducing the thermal transfer the other way. The principle behind this is the difference in thermal wavelength of energy transmitted from the sun and that transmitted from the heat within a room.
The special coating often gives a very slight brown or grey tint to the glass. The coating is not very robust and would not last very long if subjected to normal cleaning or external weather conditions - for these reasons, this type of glass is normally only used in sealed double (or triple) glazed units with the special coating on the inside.
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