3. Material classification
It can be classified according to the number of functional layers and transmittance.
(1) Classification by the number of functional layers
a. Single silver Low-E coated glass
Usually contains only one functional layer (silver layer), plus other metal and compound layers, the total number of film layers reaches 5 layers.
b. Double silver Low-E coated glass
Usually has two functional layers (silver layer), plus other metal and compound layers, the total number of film layers reaches 9 layers.
c. Triple silver Low-E coated glass
Usually has three functional layers (silver layer), plus other metal and compound layers, the total number of film layers reaches more than 13 layers.
(2) Classification by transmittance
a. High transmittance
The transmittance is more than 70%, which allows a large amount of visible light to enter the room.
b. Medium transmittance
The transmittance is 50%-70%, which has a strong blocking effect on visible light.
c. Low transmittance
The transmittance is less than 50%, which has a strong blocking effect on visible light.
4. Material technology
There are two mature process technologies for manufacturing Low-E glass, namely:
① Physical method "vacuum magnetron sputtering process" (offline Low-E)
② Chemical method "chemical vapor deposition process" (online Low-E).
a. Vacuum magnetron sputtering process (offline Low-E)
A technology that uses the magnetic field of the cathode surface to form an electron trap, so that the electrons drift close to the cathode surface under the action of E×B.
