Low-E Glass


Low-emittance (Low-E) coatings are microscopically thin, virtually invisible, metal or metallic oxide layers deposited on a window or skylight glazing surface primarily to reduce the U-factor by suppressing radiative heat flow.

The principal mechanism of heat transfer in multilayer glazing is thermal radiation from a warm pane of glass to a cooler pane. Coating a glass surface with a low-emittance material and facing that coating into the gap between the glass layers blocks a significant amount of this radiant heat transfer, thus lowering the total heat flow through the window. Low-E coatings are transparent to visible light.

Different types of Low-E coatings have been designed to allow for high solar gain, moderate solar gain, or low solar gain.

1. High transmission Low-E glass

High visible light transmittance
High solar energy transmittance
Extremely high far infra red reflectance


2. Solar shading Low-E glass

Medium visible light transmittance
Low solar energy transmittance
Extremely high far infra red reflectance


3. Double silver Low-E glass

High visible light transmittance
Extremely low solar heat transmittance


4. Triple silver Low-E glass

Within the coating structure of triple silver Low-E glass, there are three silver layers. As a result, triple silver Low-E glass performs better against solar heat than double silver Low-E glass and is currently the best silver based Low-E glass in terms of high visible light transmission and energy efficiency. Triple silver Low-E glass is suited for high transparency buildings with special solar shading requirement.

5. Bendable and post-temperable Low-E glass Can be bent and post-tempered after coating

Has Optical properties are and energy efficiency as ordinary Low ‘e’ glass

Specifications

Dimensions of standard sheet (mm): 2440x3660, 2400x3300, 2100x3300

Maximum dimension (mm): 3300x6000

Minimum dimension (mm): 300 x 800

Thickness (mm): 3, 4, 5, 6, 8, 10, 12, 15, 19

Other thicknesses and sizes may be available upon request.

When installed on the #3 surface of an insulated glass unit (IG), the Low E coating will reflect IR heat from inside the room to help reduce the energy loss during the cold months, thereby reducing heating costs.

When installed on the #2 surface of an IG unit, the Low E coating will reflect or absorb IR heat from the outside, thereby reducing solar gain and cooling costs during the warm months.


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