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.

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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:

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Guaranteed durability
Tested in accordance with BS EN 16755: 2017 standard.

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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.


Technical questions?

Get in touch with our fire retardant expert.

Geoffrey Moerman

Geoffrey Moerman

+32 (0)471 98 22 79

Technical sales advisor Lemahieu Fire Protection® with Burnblock® Ostend