3M™ fire barrier self-locking pillows are self-contained firestops ideal for medium to large through penetrations. Pillows feature interlocking strips installers can easily lock multiple pillows together to achieve precise fill and compression with no additional support required. Intumescent fire rated pillows are designed to expand during a fire, locking themselves around vital components. Simply a better way to firestop presenting a simpler solution to the time, cost and material challenges of firestopping medium and large through penetration openings 3M™ fire barrier self-locking pillows combine intumescent fire rated material and a range of sizes with interlocking strips that allow installers to easily lock multiple pillows together without tools. Installers can also cut and reseal the pillows in the field. This makes it easier to assemble ideally sized firestops for specific penetrations in floors and walls, installed to the correct compressions for maximum effectiveness in new construction or retrofit applications. No wire mesh, steel cover plates or other additional support is required. The pillows are fully re-enterable and reusable the interlocking strips can be released by hand, making it easy to reconfigure firestop pillows as additional services are added or relocated. Recommended applications firestopping medium to large openings containing power or communication cables and conduits gypsum wall, concrete or block wall and concrete floors blank openings up to 540 sq-in (3483 sq-cm) 1 or 2 cable racks or trays per penetration conduit bank, inner duct cable and cable racks or tray applications can be used in conjunction with 3M™ moldable putty+fully tested and approved these intumescent, graphite-free 3M™ fire barrier self-locking pillows are designed to expand during a fire, locking themselves into place to protect vital components and forming a tight seal against the spread of flame, smoke and toxic gasses. They are firestop tested up to 3 hr in accordance with ASTM E 814 (UL 1479) and CAN/ULC-S115 when installed in listed systems. The science of better fire protection from 3M™ since 1925 when a 3M™ lab assistant invented masking tape, 3M™ has been applying science to life developing adhesive products and technologies that help entire industries and individual businesses worldwide. The work that began with a single 3M™ engineer now spans decades and generations. And all of it goes into each 3M™ adhesive, sealant, protective coating and firestop system like 3M™ fire barrier self-locking pillows to improve performance, and to help businesses like yours operate faster, better and more efficiently.