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Types and curing mechanism of silicone structural sealant

September 06,2021

Silicone structural sealant is a special material for bonding building panels (such as glass) to metal (such as aluminum) frames. Silicone structure sealant is divided into one-component silicone structure sealant and two-component silicone structure sealant according to the curing method when it is used.

One-component silicone structural sealant can be directly applied between aluminum alloy and glass. It cures by absorbing moisture in the air, and the condensation reaction solidifies from the surface to the inside. When application, the temperature is not less than 23℃, and the humidity is not less than 40%, otherwise it will affect the curing and reduce the strength of the sealant. It usually takes 21 days to fully cure. One-component silicone glue is divided into acid and neutral. Acetic silicone sealants emits acetic acid when curing, which has obvious corrosion on concrete, porous stone and many metal materials, so it can only be used for sealing ordinary glass, toughened glass and ordinary aluminum.