Using MDF or timber panels for fire rated doorsets
Is it ok to use MDF or timber panels for fire rated doorsets?
The use of those type of panels mentioned above is prohibited unless there is suitable evidence from controlled tests that a specific solid panel as mentioned above and contained within a particular doorset design has matched the required rating.
The most common approach is to use a tested specification for panels with a composite construction, such a panel must have a proven non-combustible core faced either side by a minimum thickness (prescribed in assessment) of timber or MDF.
Chippy for DirectDoors.com