TIMCO | Fire & Acoustic Seals FD Fire Door Foam 

Fire & Acoustic Seals 'Fire Door Foam' is a revolutionary Polyurethane Foam designed to seal the gaps between walls and fire door frames.
The product has been extensively tested to achieve 30 and 60 minutes fire resistance in a wide range of construction and building fire stopping applications.
timco.co.uk/FAS-750G-fire-aco...