Low-Emissivity Glass refers to a series of high-performance low-emissivity products.
Benefits：
Almost neutral in color.
Highly transparent to visible light (wavelength 380nm ~780nm), will not cause significant glare problems due to high reflectance of visible light.
Allows most sunlight in the visible range to enter without altering its natural color. Provides excellent natural illumination and saves energy by reducing the need for artificial lighting.
Relatively high reflectance of infrared radiation (wavelength 780nm~ 3,000nm).
In particular, reflects nearly all long-wave infrared(wavelength over 3,000nm).
Blocks the entrance of large amounts of heat, and leaves interior comfortably cool in the summer and warm in the winter.

Application:
window & door glass, curtain wall, skylight etc.

Terms
Visible light transmittance: Percentage of visible light permeating glass within the range of visible spectrum (380 nanometers to 780 nanometers)
Visible light reflectance: Percentage of visible light reflected by glass s within the range of visible spectrum (380 nanometers to 780 nanometers)
Solar transmittance: Percentage of ultraviolet light, visible light and near-infrared light permeating glass within the range of solar spectrum (300 nanometers to 2500 nanometers)
Solar reflectance: Percentage of ultraviolet light, visible light and near-infrared light reflected by glass within the range of solar spectrum (300 nanometers to 2500 nanometers)

U value: Rate of heat transfer from air to air formed due to glass heat transfer and temperature difference between indoors and outdoors under ASHRAE standard conditions.

Shading coefficient (Sc): the ratio between the solar radiation permeating a glass component and the solar radiation permeating 3mm transparent glass (the solar radiation permeating 3mm transparent glass is 630w/m2)
Sc = Solar Radiation Permeating Glass ÷ 630w/m2
Shading coefficient (Sc) reflects the rate of heat transfer when direct solar radiation permeates glass.

Relative heat increase: total instant heat increase when solar energy permeates the glass; including heat increase for solar radiation (shading coefficient) and heat increase for transfer (U value). The lower the relative heat increase is, the better the performance is.
Relative heat increase = U value × (TO– Ti) + 630 × Sc [W/m2]
Specification
Product thickness: 3mm～19mm
Maximum size: 3300mm﹡6000mm
Quality
Conforming to GB/T18915.2-2002 national standard for coated glass