Why are UPVC doors and windows said to be watertight and airtight?

First of all, UPVC (unplasticized polyvinyl chloride) material itself has good waterproof properties, which enables UPVC doors and windows to ensure the sealing performance between door and window frames and window sashes during the manufacturing process. This material is not easily eroded by moisture, ensuring the watertightness of doors and windows.

Secondly, the design of UPVC doors and windows usually takes into account the need for sealing. They often feature multiple seals, including sealing strips between the window frame and sash to ensure a tight fit when closed, preventing air and moisture from penetrating. In addition, the drainage system of UPVC doors and windows will be carefully designed to ensure that rainwater can be drained out in time to avoid damage to doors and windows caused by accumulated water.

Therefore, UPVC doors and windows have excellent water tightness and air tightness, which can effectively prevent moisture and air penetration, creating a comfortable and dry environment indoors.