Durability | Fire Protection | Lemahieu Group

No coating is required to counteract leaching

The timber/panels treated with fire retardant, Burnblock®, by Lemahieu Fire Protection® 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 EN 16755: 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.

Cut from the right wood

Our wide-ranging timber and panel knowledge, innovative techniques, and sustainable materials cohere to guarantee ecologically sound applications for indoors and outdoors. Do you want more information about our products or already know exactly what you want to put in our capable hands?