Buying Guide 1

BEFORE you buy...


What types of Intumescent Protection materials are there?

There are two main types of material.

  • Graphite based (dark grey/black in colour)
  • Mono Ammonium Phosphate or MAP (white in colour, sometimes called by the Brand name 'Interdens')

There are 4 main thickness of material.

  • 0.5mm - can be both graphite and MAP
  • 0.8mm - mostly found in graphite only
  • 1.0mm - can be found in both graphite and MAP (most commonly used in FD30 doors)
  • 2.0mm - can be found in both graphite and MAP (most commonly used in FD60 doors)

What is the difference between the materials?

Both graphite and MAP material perform the same function ie to fill the gaps created when you cut into a fire door or frame (to fit the ironmongery). In the event of a fire they EXPAND up to 20 times their original size to seal the gaps in the door and frame.

Where you have a CHOICE, the differences are.

  • Graphite material is smooth, non-fibrous and flexible (also easy to un-stick and re-apply)
  • MAP material is fibrous to touch and non-flexible (it normally snaps if you try and un-stick it)

Step 1 - Find The Fire Certificate

To find out whether your product requires Intumescent Protection you have 3 main options.

  1. Ask your supplier for the Fire Certificate & if they can't help...
  2. Ask the manufacturer for the Fire Certificate & if they can't help...
  3. Ask a member of our team for the fire certificate (call 01305 457703 or email

Step 2 - Read The Fire Certificate

The fire certificate will have a section that tells you which type of material (and how thick) to use in the rating you need.

ie the certificate will say (for example) 'For FD30 (30 minute doors) use 1.0mm of either Mono Ammonium Phosphate or Graphite Intumescent Material'

As a general rule (but not always) FD30 doors will need 1.0mm of material and FD60 doors will need 2.0mm but we always recommend that you check before buying.

Step 3 Sheet material or Pre-Cut to Size?

Intumescent Protection is generally sold in two options.

Pre-cut to size - Individual to the lock or latch and with open access points for bolts etc.. (VERY easy to fit)
Sheet Material - Able to be cut to any size (to suit your lock or hinge etc..) but without pre-cut access points

Step 4 (Money Saving Tip!) The 'Lawnmower Rule'

Getting products wrong on a fire door can be a dangerous and COSTLY mistake to make.

Companies can be fined up to £400,000 for endangering life through inadequate fire safety measures.

So...if your supplier also sells lawn mowers then they are less likely to be well versed in matters of fire standards and safety.

We would ALWAYS RECOMMEND that you buy from passive fire protection specialists, you can be more confident of getting the right product and good advice from people who work with fire doors day in and day out.

Further Information & Support

Fire Essentials Ltd is part of the 'Catch The Killer' awareness campaign and we work with companies and installers EVERY DAY to help them get the right product for their fire doors.

We specialise in Intumescent Protection and work closely with teams that have developed and manufacture these products in the UK.

For further assistance please contact us:

Email our central team at
Call our helpline on 01305 457703
Complete the online form and one of our team will get back to you (within 2 working hours)

'It is our job, to make YOUR JOB easier'