The Causes of Silicone Sealant Pollution on Curtain Walls

The main manifestation of the pollution problem is that the pollution area spreads around along the seam of the silicone sealant.

There are some "smudge" and "flow marks" on both sides of the sealant, and some areas are very large. What is the cause of this pollution? How to solve and prevent it?

As the outer protective structure of the building, Curtain Walls play the functions of sound insulation, heat insulation, and rainproofing. With the development of curtain wall materials, architects can achieve architectural decoration design effects that were previously difficult to realize. However, if the curtain wall appears serious pollution phenomenon, which will not only fail to achieve the expected aesthetic effect but also may seriously affect the overall aesthetic of the building.

Penetration pollution is common in the curtain wall of porous materials such as stone. The main phenomenon is that the surface of the substrate in contact with the silicone joint has blackening and discoloration caused by similar oil infiltration.

Penetration contamination is an irreversible process, once it occurs, which cannot be eliminated, and the entire panel can only be replaced.
Vertical flow pollution is caused by rain erosion after dust adsorption on the surface of glue joints or platforms and inclined planes, so as long as it is exposed to the outdoor curtain wall, there may be vertical flow pollution.

Although vertical flow silicone pollution can be removed, it requires a lot of manpower and material resources, especially on high-rise curtain walls, which are difficult and expensive to clean.

Tengyu TNS-721 silicone sealant is special for all kinds of the curtain wall (glass curtain walls, aluminum curtain walls, stone curtain walls, etc.), the porous materials such as stone and surface-coated aluminum plate, aluminum plate, and other decorative materials are not permeable pollution. Neutral cured at room temperature, which has an excellent performance like strong adhesion, high strength, high elasticity, high modulus, and strong ability to resist movement.