The Industry Standard for Hardness The hardness of a wood is rated on an industry wide standard known as the Janka test. The Janka test measures the force. The Janka Scale is a comprehensive chart of hardness ratings for a huge variety of wood species used for hardwood floors. Learn how to read it and how it. 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.

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In Janka’s original test, the results were expressed in units of pressure, but when the ASTM standardized the test tentative issue instandard first formally adopted init called for results in units of force. Properties of Seven Columbian Woods. Forest Products Lab, January Other factors affect how flooring performs: Retrieved 28 August Red Oak, which acale a Janka rating ofis the industry benchmark for comparing the relative hardness of different wood species.

Overall, the resulting measure is acale one of force.

Janka Hardness Using Nonstandard Specimens. The results are stated in various ways in different countries, which can lead to confusion, especially since the name of the actual unit employed is often not attached.


End testing is jank sometimes done that is, testing the cut surface of a stump would be a test of end hardness.

The results are stated in various hardnses, which can lead to confusion, especially when the actual units employed are often not attached. The side hardness of teak, for example, is in the range to newtons, while the end hardness is in the range to newtons.

The hardness of wood usually varies with the direction of the grain. This should only be used as a general guide when comparing various species of wood flooring. This number is incredibly useful in directly determining how well a wood will withstand dents, dings, and wear—as well as indirectly predicting the difficulty in janja, screwing, sanding, or sawing a given wood species.

Janka Hardness

I have amassed scalf wood species on a single scalee, arranged into eight major geographic regions, with each wood sorted and ranked according to its Janka hardness. The Janka test is often used to deduce bamboo flooring hardness. The record softness of 22 lbf is often falsely ascribed to quipo, but all such reports appear to be a misreading of figures 15 and 16 from this primary source, which makes clear that measurement is of balsa, and the softest quipo measured was 46 lbf tangential, 38 lbf radial.

The Janka hardness test from the Austrian-born emigrant Gabriel Janka, measures the resistance of a sample of wood to denting and wear. Sometimes the results are treated as units, e.


scqle Blank cells occur where a wood is sold commercially but so far we have found no hardness data. This test measures the force required to embed an Antony Croft October 22, at 1: The Janka Hardness Scale rating has become the industry standard for determining whether a given wood is suitable for flooring material.

Janka Wood Hardness Scale

The pale blue background indicates species growing in North America. By using this site, you agree to the Terms of Use and Privacy Policy. This test is one of the best measures of the ability of a wood specie to withstand denting and wear.

With the rising popularity of bamboo as flooring, the Janka test has been forced to include the diverse ratings for different bamboo floors.

Leave this field empty. Frame and panel Frameless construction. A measure of the hardness of wood, produced by a variation on the Brinell hardness test. From Ajnka, the free encyclopedia. It is also a good indicator of how hard a specie is to saw, mill and nail.

Hardness information is in chapter 5. Southern Yellow Pine Longleaf.