Janka Hardness Scale
The Janka hardness test is a wood density measurement. The Janka ratings are determined by the force (pounds per square inch) required to embed a small steel ball half its diameter into the wood. Janka Hardness is an indicator of the durability of wood, and also can determine what it will be like to saw, nail, and sand different species.
It’s important to know the relative density of wood when choosing your hardwood floor since durability and wear-resistance are often principle factors. For example, a family with three large St. Bernard dogs would prefer Brazilian Cherry (2820) floors instead of Chestnut (540).
Janka Ratings are relative and can fluctuate depending on grain and growth rings. Flat, horizontal grain is tested and rarely does Janka reflect vertical grain tests. Some trees will grow faster at different latitudes and therefore having tighter growth rings and higher density.
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