Plastic doors and windows should be installed elastically, because it has the characteristics of thermal expansion and contraction, so the seal between the door and window and the wall interface during installation is a sealed state of movement. General steel doors and windows swell and shrink value up to 10 mm or more. In order to ensure its normal expansion and contraction, the inner cavity of the gap between the door, window and wall should be filled with elastic material.
The currently used elastic materials include cold felt strips, foam plastics, silicone foam sealants, polyurethane foaming agents, and the like. Elastic materials are resistant to shock, cracks, water, heat, and adhesion.
Windows and doors
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