TimberSIL® fire retardant properties (Class A) have been confirmed by Intertek Testing and Certification Services. Ignition resistant

A Class-A Fire retardant rating means that
when a flame contacts Class A fire
retardant wood, the flames will not spread;
however there may be scorching or
charring where the contact occurred.
TimberSIL® meets the standard for Class A
Fire retardant and for reduced levels of
smoke, for the 30-minute extended ASTM
E84 fire test.

When a flame attacks wood not protected
by TimberSIL®, the heat causes wood to
break down and it releases volatile fumes
which catch fire above the wood. The
reason TimberSIL® is such an effective fire
retardant is that when a flame attacks
TimberSIL® products, the glassy portion
traps the volatile fumes that are produced
and they cannot escape; this keeps
TimberSIL® from catching fire and prevents
the flame from spreading.