The 4100SL caulking maintains flexibility after curing, accommodating building movement without compromising its fire-resistant properties. Its ease of application with standard caulking guns makes installation straightforward for contractors and installers, enhancing efficiency on construction sites. Tested to stringent fire safety standards, this product offers peace of mind to building owners and occupants, reinforcing overall fire protection measures in commercial, industrial, and residential settings where horizontal firestopping is crucial.