How to choose silicone sealant？

1. Structural assembly parts.

The sealant used between the curtain wall panel and its supporting structure needs to withstand multiple loads and ensure long-term adhesion, and must meet the requirements of national mandatory standards. Especially in high-rise and super-high-rise curtain walls, large-grid glass curtain walls, and curtain walls using laminated insulating glass, high-performance silicone structural sealants are more needed. Because this sealant has high tensile strength and elongation at break, it can withstand greater loads with the same bonding width.

2. Joints of building curtain panels.

The expansion joints between building curtain wall panels need to be filled with glue, and silicone weather-resistant sealant should be used at this time. Because in this environment, silicone sealant needs to withstand the displacement caused by wind load, dynamic load, and deformation caused by thermal expansion and contraction of the substrate. In the case of tension or compression, the adhesion will not be destroyed, and it also has a good elastic recovery rate. After the displacement of the panel disappears, it can return to its original state.

3. Stone panel parts.

Stone panel parts must use special stone silicone sealant. Because stone itself is a porous material, it is easily contaminated and difficult to remove after contamination. General sealants contain non-reactive low-molecular substances such as plasticizers, which will migrate from the inside of the sealant to the inside of the stone, causing oil stains on the surface of the stone and dust absorption, causing stone pollution.

4. Position of the skylight top.

Due to its own weight load, the displacement caused by thermal expansion and contraction of the material is large and complex, with not only horizontal displacement but also shear displacement. This requires the sealant to have low modulus, high displacement capacity, good material adaptability, and free expansion and contraction. It is best to use 50LM silicone sealant with a displacement capacity of plus or minus 50%. In addition, the glue used for the skylight top is also required to have good transparency and be beautiful.