The K value of architectural glass is defined as: under standard conditions, the heat transfer from one side of the unit area of ​​the glass component to the other side of the air per unit time. The K value is mainly used to measure the heat transfer through the glass system. This value is a function of temperature. The calculation method is the heat passing through one square meter of glass per hour at a temperature difference of one degree Celsius. The unit system is w/m2.k, where w is the heating power, m2 is the glass area, and k is the temperature in Celsius.

According to statistics, building energy consumption has accounted for 27.5% of the terminal energy consumption of the whole society, and the energy lost through the gaps around loosely closed doors and windows usually accounts for about 37-40% of the building's energy consumption. Therefore, it is very important to improve the sealing performance between the PVC frame and the glass, especially between the PVC window frame and the window sash.

The discoloration of PVC profiles is the result of a variety of factors. In addition to the internal and external influencing factors and additives discussed above, the factors that cause discoloration of the profile in the production process and equipment molds should also be considered.

A good UPVC profile should be a reasonably designed multi-cavity, with a wall thickness, and the formula contains anti-aging and anti-ultraviolet additives.

Nowadays, uPVC and aluminum alloy windows are more popular due to their durability, aesthetics and cost-effectiveness. When we compare uPVC and aluminum windows, its performance, cost and aesthetics play an important role in choosing windows. Here are some basic differences between them.