The characteristics of Low-E glass
1.Excellent thermal performance
Low-E glass could use for building doors and windows, which can greatly reduce the transfer of indoor heat energy to the outside caused by radiation, achieving ideal energy-saving effects. By using Low-E glass, the reduction of heat loss can significantly reduce the fuel consumption for heating, thereby reducing the emission of harmful gases. Low-E glass can meet the requirements of winter and summer, providing both insulation and environmental protection and low-carbon effects.
2.Excellent optical performance
The visible light transmittance of Low-E glass ranges from theoretical 0% -95% (which is difficult to achieve with 6mm white glass), and the visible light transmittance represents the indoor lighting performance. The transmittance of Low-E glass is much higher than that of ordinary white glass, with a more transparent visual effect and higher daylighting performance.
3.Energy conservation and environmental protection
Using Low-E glass to manufacture building doors and windows can greatly reduce the transfer of indoor heat energy to the outside caused by radiation, achieving ideal energy-saving effects. At the same time, it can significantly reduce the fuel consumption for heating, thereby reducing the emission of harmful gases.
4.Thermal insulation
In winter, the indoor temperature is higher than the outdoor temperature, and low radiation glass can transfer less heat indoors to the outside, thereby achieving insulation effect. In the same summer, the indoor temperature is lower than the outdoor temperature, which can transfer as little outdoor heat as possible to the indoor environment, achieving the effect of insulation.
5.Dustproof but also aesthetically pleasing
The double-layer hollow Low-E glass has a composite sealing strip that integrates insulation, drying, and sealing. It has good sealing performance and is not easy for moisture and dust to enter. It also has a certain degree of obscurity, with no visible interior view from the outside, and a clear and dustproof view from the inside, emphasizing both privacy and openness. Low-E glass is divided into three basic color tones: blue, green, and gray. Different processes can be made based on different thicknesses and material combinations. For example, neutral colors, gold (rose gold), silver, and other relatively distinctive colors.
Low-E glass production process
From a technological perspective, Low-E glass can be divided into online high-temperature pyrolysis deposition method and offline vacuum magnetic sputtering method.
1.Online high-temperature pyrolysis deposition method
It is completed during the cooling process of float glass, where liquid metal or metal powder is directly sprayed onto the surface of hot glass. As the glass cools, the metal film layer becomes a part of the glass. This type of glass has a single variety, poor thermal reflectivity, and low manufacturing cost. Its only advantage is that it can be hot bent and tempered, and does not need to be used in a hollow state. It can be stored for a long time.
Its disadvantage is that its thermal performance is relatively poor. Unless the film layer is very thick, its "u" value is only half of the sputtering method "Low-E" coated glass. If you want to improve its thermal performance by increasing the film thickness, its transparency will be very poor.
2. Offline vacuum sputtering method
The offline production of Low-E glass is currently a widely used vacuum magnetron sputtering coating technology internationally. Unlike the high-temperature pyrolysis deposition method, the sputtering method is offline and can be divided into horizontal and vertical depending on the glass transport position.
The variety is rich and colorful, with excellent thermal reflection performance and obvious energy-saving characteristics. According to different climate characteristics, high, medium, and low transmittance products can be made. The colors include silver gray, light gray, light blue, and colorless transparency. Colored glass can also be used to make various other colors such as green. Its disadvantage is that it cannot be hot bent, and the silver oxide film layer is very fragile, so it cannot be used like ordinary glass. It must be made into insulating glass, and before it is made into insulating products, it is not suitable for long-distance transportation.