Solution > Fire retardant treatment
Durability through time
No coating is required to counteract leaching
The timber/panels treated with fire retardant, Burnblock®, don't require a coating in order to counteract leaching. The durability of the treatment over time is guaranteed without coating for external applications.
Durability according to
BS EN16755:2017 standard
For this purpose, tests are being carried out in accordance with EN927-6, one of the three test options within the new BS EN16755:2017 standard. The test comprises an accelerated weathering process with UV and the equivalent of over 120 years of rain in Belgium.
The tests are carried out on ThermoWood® pine and Western Red Cedar and both retained reaction to fire class B, both before and after accelerated ageing, in accordance with test method ISO 5560-1: 2015.
Reaction to fire class B remains
The following applies to the durability of timber products treated with Burnblock® fire retardant using a vacuum/pressure:
The effect of the fire retardant characteristics decreases at a speed equal to the degradation/ageing of the timber itself.
This means that the effective level of fire retardant per unit of timber remains unchanged, thus allowing Burnblock® to retain the reaction to fire class B
The fire retardant treatment by Lemahieu Fire Protection® is unique thanks to the combination of:
Guaranteed durability
Tested in accordance with BS EN 16755: 2017 standard.
Fire retardant
Burnblock® is 100% biodegradable
and Cradle-to-Cradle Gold-certifiedTM
For your information
If another type of fire retardant treatment is chosen where a protective coating is necessary against leaching, then one is obliged to reapply this coating regularly (every 5 to 10 years). It goes without saying that the necessary budget must be provided for this during the life of the building.
