Low-E Glass

“Low-E Glass” refers to a series of high-performance low-emissivity products manufactured by TGI introducing state-of-the-art vacuum sputtering coating equipment and technology from USA's Applied Films Group and Germany's Von Ardenne. The vacuum sputtering process coats glass surfaces with several layers of different materials. Among these, a silver layer effectively reflects infrared rays while maintaining excellent thermal performance. Beneath the silver layer is an anti-reflective tin oxide (SnO2) base layer that increases the transparency of the glass. Above the silver layer is an isolating nickel-chromium (NiCr) alloy coating. The main function of the top anti-reflective tin oxide (SnO2) layer is to protect the other coating layers. This product offers the high transparency, low reflectivity, good thermal insulating and energy-saving properties required of modern architectural glass.



Construction of Low-E Insulating Glass Unit

Types of Product

Single Low-E Glass (SLE)
Double Low-E Glass (DLE)
Low-E-Sun Layer Glass (LES)
Ti-based Low-E Glass (TLE)

back to top

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.

back to top

The right assembly suitable for energy-saving glass curtain walls and skylights in modern Green Building located in hot subtropical areas, such as Taiwan.

Spectrum for different coating glass transmission

back to top

Thickness 3 ~ 19mm
Max. size 100" x 144" (2540mm x 3658mm)
Min. size 12" x 39" (305mm x 991mm)
Low-E insulating glass max. size 96" x 138" (2438mm x 3500mm)
TGI Low-E Insulating Glass Optical Performance Data

back to top
Notes on Design and Glazing

Low-E glass cannot be used as a single glazing and must be sealed or processed into insulating glass unit within a very short time as the metallic oxide coating is prone to undesirable reactions once exposed to air.
Emissivity of Low-E insulating glass is 0.02 ~ 0.11, while that of uncoated glass is 0.84.
In tropical or subtropical areas, the Low-E coating should be positioned on #2 surface (facing inward from outside the building), while positioned on #3 surface in temperate areas.
The finished Low-E glass products cannot be further bent-processed.
Traditional Low-E glass must be tempered before coating. TGI is developing processable Low-E glass which can be tempered after coating.
To avoid deterioration and fogging of the glass due to water accumulation, the metal holding frames must be well drained.
Low-E glass designed for laminated glass unit will be under a greater U-value and poorer thermal insulating capability.
To identify the coating surface of Low-E glass, aside from looking for the TGI mark, use a cigarette lighter to inspect the surface of the glass. Reflection of the flame on ordinary glass surface will be yellow, while pink or blue on Low-E glass surface.



Blocks the transmission of most solar heat radiation;
keeps room pleasantly cool by allowing only a small amount
of heat in (Low-E coating on second surface).

Low-E insulating glass keeps interior warm by blocking
outward radiation of heat.

back to top

Changchun Finance Building

e-Park Technology Center I

e-Park Technology Center II

Hsin-Chuang Stadium


Nankang Software Park

RiTdisplay Building

Inotera Headquarter


back to top