Pillows are manufactured from treated cloth filled with a high density, granulated fire
seal material. When exposed to fire, the pillows remain in place, thus forming a fire
barrier of a solid mass of insulating material.
Between 100 and 130 are usually required per m² of an open area; however, the
pillows can be easily placed in many openings where it would be difficult to apply
other products or wet systems.
In the case of smaller penetrations, it is often more economical to use the pillows,
especially if labour costs are a concern, because the required fire performance can
be achieved with the application of just a few pillows.