Janka Hardness Test
What is the Janka Hardness Test?
Janka hardness test measure the hardness or density of wood. Testing is done on samples, not on actual flooring. It measures the force required to embed a 0.44โณ steel ball into the wood until half of the steel ball is into the wood. It was developed as a variation of Brinell test (measurement method of hardness of metals). Factors affect how flooring performs with type of core (for engineered flooring), grain direction and thickness of surface.
Results of measurements are stated in various ways for different countries. In United States, the measurement is in pounds-force (lbf). Other countries may state the test result in different units: kilogram-force (kgf), newtons (N), kilonewtons (KN), or simply treated as units (ex. โ660 Jankaโ).
For more information on Janka testing, please follow this outside link to USDAโs Forest Service, Research and Development: Forest Product Laboratory.
Janka Rating Table
Wood species Riveroaks Hardwood Carries
