FPC Intumescent Pillows are fibreglass covers containing:
Mineral Fibres
Non Combustible Agents
Intumescent material
Other fire retardant Additive
When Operating temperatures are reached in a fire the contents of the FPC Intumescent Pillow stick together and start to expand so closing the small gaps and crevices around the penetration, until they harden to form a smoke and flame tight mass.
Visit the FPC (UK) Ltd website for more information on Fire Pillows