The TimberSIL® fusion of wood and glass creates a product that is approximately twice as hard as the wood we start with.

As measured by the Janka Scale, below, the hardness of southern yellow pine increases from 690-870 lbs-force (range depends on species), to 1560 lbs-force, approximately double.

The Janka hardness test measures the hardness of wood. It involves measuring the force required to embed a 11.28 millimeter (0.444 inch) steel ball into wood to half its diameter. This method was chosen so that the result would leave an indention 100 square millimeters in size. It is one of the best measures of the ability of a wood species to withstand denting and wear. It is also a good indicator of how hard a species is to saw or nail.

TimberSIL® Wood Products are harder than all softwoods, and become harder than most hardwoods, as shown at below.