What is the most common problem of sealant failure?

In doors and windows, sealants are mainly used to seal the joints between window frames and glass, and between window frames and internal and external walls.

Problems in the application of door and window sealants will cause the door and window seals to fail, resulting in water leakage, air leakage and other problems, which seriously affect the overall quality of doors and windows.

This article introduces some common problems in the application of door and window sealants, and provides solutions by analyzing the causes to help users use sealants better.

① Poor bonding

In the application of door and window sealants, the substrates that may be exposed to include glass, aluminum, cement mortar, tiles, wall paint, etc. There may be oil, dust or other residual substances on the surface of these materials. If the adhesion is not confirmed before construction, it may cause poor adhesion of door and window silicone sealants.

When the sealant is used at the joints between doors and windows and cement mortar exterior walls, if the dust and sand on the surface of the exterior wall cement mortar are not cleaned up, the sealant may not bond after curing.

Therefore, in the actual use of sealants, it is necessary to pay attention to pre-treatment of the surface of the bonded substrate and use appropriate methods to remove oil, dust, sand, loose layers that are easy to fall off, etc.

② Storage issues of sealants

Sealants are chemical products with a certain storage period and need to be used within the storage period. If the sealant has exceeded the shelf life, it is likely that the curing speed will be significantly slower, the curing will be poor, or it will not be able to cure.

According to the requirements for storage conditions in the relevant standards for sealants, the nominal storage period of sealants is below 27°C and stored under cool, dry and ventilated conditions.

If the storage environment in actual use cannot meet the conditions specified in the standard, such as the ambient temperature is too high, the storage period of the sealant may be shortened. Even if the sealant does not exceed the nominal storage period under this condition, slow curing will occur.