Hardwood Janka Rating Scale

Janka hardness ratings of wood species.

Hardwood janka rating scale.

In laymans terms it is a way to measure a woods resistance to denting. Although not exact the scale is a good reference for which hardwood can better withstand denting and wear when compared with another wood species. Janka wood hardness scale. The janka hardness scale determines the hardness of a particular type of wood over another.

The scale was invented in 1906 by gabriel janka an austrian wood researcher and standardized in 1927 by the american society for testing and materials depending on the room where the flooring will be installed a certain level of hardness may make it a more desirable choice. The janka rating is a measure of the amount of force required to push a 444 diameter steel ball half way into a piece of wood. It measures the force required to embed an 11 28 millimetres 0 444 in diameter steel ball halfway into a sample of wood. The janka scale is used to determine the relative hardness of particular domestic or exotic wood species.

The janka test measures the amount of force required to embed a 0 444 steel ball into the wood to half of its diameter. The scale used in the table is pounds force. It is important to remember that the testing process used in the janka scale is an impact test not a test of scratching scuffing or any other wear and tear that flooring experiences. A common use of janka hardness ratings is to determine whether a species is suitable for use as flooring.

Woods with a higher rating are harder than woods with a lower rating. The janka chart is commonly used in the flooring industry to compare hardwood flooring types.