Janka Hardness

The janka hardness test is a method used in the wood industry to calculate the resistance of a wood species to denting and wear. This test is performed by measuring the force required to imbed a 11.28 mm steel ball  halfway into a sample of wood. For hardwood flooring the sample used usually requires a 2"x6" sample with a thickness of at least 6-8mm. The necessary kgs of force needed to imbed the ball halfway becomes the specie's janka rating.