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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Who could imagine a wood species that is over three times harder than White Oak? Soft and Ambrosia Maple.
Janka hardness test
How Stable is Your Wood? The most common use of Janka hardness ratings is to determine whether a species is suitable for use as flooring. Where would you draw the line for the hardness?
Each wood has been meticulously documented and photographed, listed with its Janka hardness value in lbf and geographic and hatdness hardness rankings.
Is there a specific threshold? This method results in an indention square millimeters in size. For years, bamboo was not mentioned in Janka reports and list. The results are stated in various ways, which can lead to confusion, especially when the name of the actual units employed is often not attached.
The chart is not to be considered an absolute; it is meant to help people understand which woods are harder than others. Marci July 3, at 5: Canadian owned and operated. Hagdness the results are treated as units, e.
From Wikipedia, the free encyclopedia. Stability is defined by the level of flux, expansion and “movement” a wood will have when exposed to different humidity janla.
It is a question of whether you want the marks to show up on your new piece of work or on the work bench. Testing the cut surface of a stump is called a test of “end hardness”.
Some information sources say or imply, incorrectly, that Janka hardness is measured in units of pressure, such as pounds per square inch, and that side hardness is a synonym for Janka hardness. There is a standard deviation associated with each species, but these values are not given. A common use of Janka hardness ratings is to determine whether a species is suitable for use as flooring.
What size pieces are needed to run a Janka test and where can these harndess be carried out? I had a query with regards to Douglas Fir wood. The Janka hardness test from the Austrian-born emigrant Gabriel Janka, measures the resistance of a sample of wood to denting and wear. This test is one of the best measures of the ability of a wood specie to withstand denting and wear. Janka Hardness Chart listed softest to hardest click for enlarged pdf file.
All articles with unsourced statements Articles with unsourced statements from March Maple and Hickory however are two species, that are not to be acclimated in your home. Green, Marshall Begel and William Nelson. This page was hardnesd edited on 4 Decemberat Douglas fir provided a good stable surface to work on.
The higher the number the harder the wood. Thank you for clarifying. Antony Croft October 22, at 1: Depending on where the wood is harvested the results may vary.
So just wanted to check with you too. The side hardness of teak, for example, is in the range to newtons, while the harcness hardness is in the range to newtons.
Wood—Determination of resistance to impact indentation.
So, this would measure the ability of a wood be bulletproof? It has a Janka hardness of lb which technically makes it a softwood but a lot of people vouch for its durability. Archived from the original on 26 April The tabulated Janka hardness numbers are an average. The record softness of 22 lbf is often falsely ascribed to hardnesss, 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.
Janka hardness test – Wikipedia
The hardness harness wood varies with the direction of the wood grain. Retrieved 20 December Retrieved 28 August In the United States, the measurement is in pounds-force. Hardness information is in chapter 5. In the United States, the measurement is in pounds-force lbf. Skip to main content. I have amassed over wood species on a single poster, arranged into eight major geographic regions, with each wood sorted and ranked according to its Janka hardness.
But as you said, there are a lot of other properties that are more important than hardness, one of which is shock resistance.
jsnka There are many things to consider when choosing your wood, including the hardness, natural colour of the wood, the grain and the stability. Leave A Comment Cancel reply Comment. In Sweden it is apparently in kilogram-force kgfand in Australia, Janka hardness ratings are either in newtons N or kilonewtons kN.