PENOSIL FireStop Acrylic 618 is a specialized acrylic sealant designed for fireproofing low-expansion construction joints and sealing penetrations in fire-rated structures. This high-performance sealant is engineered to withstand fire for up to 4 hours, providing essential protection in critical areas. Its flexible formulation ensures effective sealing while accommodating slight movements in construction materials. Ideal for use in a variety of applications, PENOSIL FireStop Acrylic 618 helps maintain the integrity of fire-rated assemblies, ensuring safety and compliance in building projects.