Janka

Janka is a name used in several cultures and a term in wood science. As a given name, it is commonly found in Slavic-language communities, typically as a feminine form and sometimes used as a surname. The etymology varies by language, and Janka can function as a diminutive or variant of related names such as Jana in some contexts.

In wood science, the Janka hardness test is a standard method for assessing a wood species’ resistance to denting and wear. The test measures the force required to embed a 0.444 inch (11.28 mm) steel ball into a wood sample until the ball penetrates to half its diameter. The result is expressed in pounds-force (lbf) in US customary units or newtons (N) in metric usage. The Janka value is widely used to compare wood species for applications such as flooring, cabinetry, and furniture, with higher values indicating greater hardness and durability. Tests are conducted on prepared specimens under controlled conditions to ensure consistency.