Low-E glass, also known as low-emissivity glass, is a film-based product that is coated with multiple layers of metal or other compounds on the surface of the glass. The coating layer has high transmission of visible light and high reflection of mid-range infrared rays, and has excellent heat insulation effect and good light transmittance compared with ordinary glass and conventional architectural coated glass.
Low-E insulating glass has a light transmittance of more than 60% for 0.3-2.5 um solar radiation, and most of the radiant energy from the outside during the day, but at night and rainy weather, the heat radiation from indoor objects is about 50% or more. It is reflected back into the room, and less than 15% of the heat radiation is absorbed by it and then lost by re-radiation and convection exchange, so that the heat in the room can be effectively prevented from leaking to the outside. This feature of Low-E glass has the effect of controlling the flow of heat to the outside in one direction.