Due to the greater activity of doors and windows compared to the main body of the building, they are affected by wind loads and the opening and closing of doors and windows, resulting in significant deformation of the joints between the main body. This may lead to the rupture and peeling of the sealant, grassroots, and airtight membrane. Therefore, the sealant for doors and windows must have certain stress relief ability, and can adapt to the door and window joints expansion and shear deformation.

Wealter specialized sealant for airtight membrane material has added MS ingredient, which has special stress relief function, good displacement deformation resistance, and can guarantee the integrity under displacement, so it ensures the continuous watertightness and airtightness.

It is mainly used with non-self-adhesive membrane materials for doors and windows to perform airtight sealing operations in ultra-low energy buildings.