Fire types and severity

Different combustible materials burn at different temperatures which will have a bearing on the FRL of a given intumescent paint coating.

This needs to be taken into account when specifying intumescent products so that the required FRL is ensured for the combustible materials that are likely to be encountered in a particular situation.

Fire condition
Jet fire

Maximum temperature

925˚C (1697˚F)

1100˚C (2012˚F)

up to 1400˚C (2552˚F)

Typical heat flux

100kW per square metre

200kW per square metre

300kW per square metre

Erosive forces




how different fire types affect FRLs

Due to the different temperatures encountered in different types of fires FRLs will obviously be affected. This graph is a simple depiction of the expected times that a material is likely to be protected for in a particular type of fire.

still can't find what you're looking for?

If you can't find what you're looking for please let us know.

We aim for this website to be a comprehensive source of knowledge for intumescent coatings professionals or anyone with an interest in the subject.

We'll let you know via email when your request has been answered.

Thanks... we'll get back to you soon.
Sorry... there's been a problem. Please call us if it continues.

engineering portal

architecural portal