What is the hollow Low-E glass?

　　LOW-E film surface position in 2# or 3# hollow glass K value is smaller (outside the 1# position, indoor 4# position), that is, thermal insulation performance is better. The shading coefficient of 3# location (measuring the total transmittance of glass to sunlight) is greater than that of 2#. This difference is the key factor to pay attention to when using Low-E glass under different climatic conditions. Cold weather conditions (northern region), in the indoor insulation at the same time people want to get more heat from the sun, the coating surface should be located at the 3# position; hot climate conditions (South), people hope that the solar radiation heat into the interior of the less, the coating surface should be located at the 2# position.

　　The appearance of LOW-E films at different surfaces is very different (the color effect of different types of Low-E glass is very different). In general, the appearance effect of the LOW-E film in the 2# position has the texture of the coated glass, while the 3# position is not. Manufacturers generally pay attention to control the color of the glass surface in production, that is, the appearance of the LOW-E film in the 2# position. Therefore, when determining the position of the LOW-E film surface, it should be selected according to the customer's preference. It is suggested that the user who pays attention to the appearance effect should choose the LOW-E hollow in the 2# position.

　　The other configuration that European and American designers like to choose is that the outer pieces of the hollow glass are coated with heat reflective coating glass, and the inner pieces use the colorless LOW-E glass. In fact, this habit is formed by historical reasons, because there are almost no other LOW-E glass in other colors at the early stage, which can only pursue the appearance decoration effect in this way.