Tips: Low E glass

Created on 2024.10.22

Low-E glass, also known as Low emissivity glass, is a film product composed of multiple layers of metal or other compounds plated on the surface of the glass. The coating layer has the characteristics of high visible light transmission and high reflection of middle and far infrared, which makes it have excellent thermal insulation effect and good light transmission compared with ordinary glass and traditional coated glass used in construction.

Performance

1. Excellent thermal performance

The heat loss of exterior window and door glass is the main part of building energy consumption, accounting for more than 50% of building energy consumption. Relevant research data show that the heat transfer of the inner surface of the glass is mainly radiation, accounting for 58%, which means that to change the performance of the glass to reduce the loss of heat energy, the most effective way is to inhibit the radiation of the inner surface. The radiant rate of ordinary float glass is as high as 0.84, when plated with a layer of silver based low radiation film, its radiant rate can be reduced to below 0.15. Therefore, the manufacture of building doors and Windows with Low-E glass can greatly reduce the transmission of indoor heat energy to the outside caused by radiation, and achieve the ideal energy saving effect.

     2. Good optical performance

The visible light transmittance of Low-E glass varies from 0% to 95% in theory (6mm white glass is difficult to do), and the visible light transmittance represents the indoor lighting. Outdoor reflectance from about 10%-30%, outdoor reflectance is visible light reflectance, representing reflective intensity or dazzling degree.

Classification

1. Single silver Low-E glass

Single silver Low-E coated glass usually contains only one functional layer (silver layer), plus other metal and compound layers, the total film layer reaches 5 layers.

2. Double silver Low-E glass

Double silver Low-E coated glass has two functional layers (silver layer), plus other metal and compound layers, the total film layer reaches 9 layers. However, the technical process control of double silver Low-E glass is much more difficult than that of single silver.

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