Hardheid van hout

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Hardness is an important characteristic for wood species . One wood specie is harder than the other. The harder the wood, the more durable the floor. How hard a floor is is measured in Janka, also known as the “Janka hardness” system (N). This refers to the force in kg required to press a smooth steel sphere with a diameter of 11.824 mm halfway into the wood (the surface area of the half steel sphere is exactly 100 mm²).

Abrasion resistance

The hardness generally increases very strongly with the bulk density. The hardness is greater on the end surface than on the other surfaces. Abrasion resistance is important for wooden floors and mechanical, moving parts. The abrasion resistance of wood species is also considerably greater on the end surface than on the longitudinal surfaces and is also quite similar to the hardness.

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Influence on the wood

The influence of brushes on the strength of wood depends on the size of the brushes in relation to the dimensions of the wood, whether or not they are close together (for example branch wreaths) and their position in the wooden element. The strength properties are largely influenced by the thread pattern.

For example, the tensile strength of a piece of wood with a crooked grain will be significantly lower. It goes without saying that cracks (for example due to careless drying) and biological damage such as insect tunnels and wood rot by fungi can drastically reduce the strength properties of the wood.

Do you want to buy a wooden floor  and want to know more about the possibilities? Then visit our showrooms in  Amsterdam, Alphen aan den Rijn or Naarden. Get inspiration for your new wooden floor before your visit and request our free magazine .