RATING THE HARDNESS OF WOOD.
Wood is measured against the Janka Hardness Test, which measures the force needed to embed a .444” steel ball in half of its diameter into a piece of wood. The higher the number, the harder the wood. Although this is one of the best methods to measure the ability of wood species to withstand indentations, it should be used as a general guide. The construction and finish also play an important role in the durability of a species of hardwood.
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