Butyl 777 is a premium grade, high solids, non-skinning, non-drying butyl rubber-based caulk compound. The caulk has a short cutoff designed for caulking the female lip of standing seam roofs. It is a non-oxidizing sealant capable of withstanding joint movement without cracking, and can be used for concealed indoor and outdoor applications. The formulation stands up to intense water head pressures as certified by independent testing. Butyl 777 maintains permanent tack, allowing the caulk to be engaged in the field between two metal surfaces up to six months after initial application.

The product is most commonly used in the precast concrete industry to seal septic tanks, manholes, pipe, box culvert, utility structures, burial vaults, wall panels. Manufactured to accommodate low temperatures. Meets requires ASTM, AASHTO, and federal specifications.