Weatherproof silicone sealants typically prioritize movement capability and long-term outdoor exposure resistance, while structural silicone sealants are designed for structural bonding and load transfer.
Both types can provide weathering resistance (such as UV, rain, and aging resistance), but they are formulated and qualified for different roles.
In application, structural sealant is commonly used for curtain wall structural bonding and certain assembly tasks, while weatherproof sealant is used for joint sealing and waterproofing between different building materials.
In general, structural sealants may have higher strength requirements and higher cost than comparable weatherproof sealants. Selection should be based on project specifications and the intended use.
