FI025 Intuflex is a fire insulation upgrade material, primarily made from rock mineral fibre, with an outer layer of foil to provide a class O surface spread of flame around a class A1 core. The foil facing in conjunction with aluminium foil finishing tape, leaves an aesthetically pleasing finish with zero fibre migration.

FI025 is designed to upgrade the insulation rating of uninsulated penetrated services (where required) which have been sealed using a Nullifire product. The application of FI025 around most services increases the “I” rating to that required by the compartment line.

FI025 has been tested around copper and steel pipes up to 160 mm diameter, cable trays, ladders and baskets, individual cables and cable bundles up to 100 mm diameter.


  • Reinstates the insulation requirements of the compartment when applied around uninsulated service penetrations
  • Tested to EN 1366-3 with copper pipes, steel pipes, cable trays/ladders/baskets, individual cables and cable bundles
  • Easy & fast installation
  • Lightweight
  • Does not de-rate electrical cables