Janka Hardwood Scale

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Janka hardwood scale.

Woods with a higher rating are harder than woods with a lower rating. This test is one of the best measures of the ability of a wood specie to withstand denting and wear. 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 test measures the force required to push a steel ball with a diameter of 11 28 millimeters 0 444 inches into the wood to a depth of half the ball s diameter.

The industry standard for hardness the hardness of a wood is rated on an industry wide standard known as the janka test. A hardwood with a high janka hardness rating may be preferable for areas where there is high traffic or if you have small children or indoor pets. The janka test measures the force required to embed a 444 inch steel ball into the wood by half its diameter. Janka hardness scale for hardwood flooring the janka hardness test was designed to rate the relative hardness of wood on a scale of 0 to 4000.

For hardwood flooring the test usually requires a 2 6 sample with a thickness of at least 6 8mm and the most commonly used test is the astm d1037. The janka scale is used to determine the relative hardness of particular domestic or exotic wood species. When testing wood in lumber form the janka test is always carried out on wood from the trunk of the tree known as the heartwood and the standard sample according to astm d143 is at 12 moisture content and clear of knots. The janka rating is given in pounds force lbf by measuring how much force is needed to imbed a standard sized steel ball halfway into the wood.

The janka test was developed as a variation of the brinell hardness test. The janka hardness scale is a test to rate the relative hardness of a wood flooring. The scale used in the table is pounds force. 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 test involves measuring the force required to embed a 444 steel ball into wood to half its diameter. The janka test is a measure of the hardness of wood.