Janka Hardwood Scale Acacia

On the janka hardness chart big leaf acacia rates 1700 pounds force while small leaf acacia rates 2200 pounds force and both fall roughly in the middle of the chart.

Janka hardwood scale acacia.

Below is an illustration that shows what the janka hardness test looks like. The janka rating indicates wood strength measured by the force necessary to drive a 444 millimeter steel ball halfway into a plank. Raspberry jam acacia has a janka hardness rating of 3100 and a very low 5 4 percent volumetric shrinkage rate. The janka hardness test measures the lb in2 required to embed a 444 inch steel ball to half its diameter in wood.

It is one of the best measures of the ability of a wood species to withstand denting and wear. The testing is done on the surface of the plank and the force is exerted perpendicular to the grain which means that the test collects side hardness data. You can read more about the janka scale and see a list of the janka hardness ratings from findanyfloor here. For example mahogany has a janka hardness of 800 lbf and brazilian walnut has a janka hardness of 3 680 lbf.

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. Acacia mangium more commonly known as black wattle in the us has a 1750 janka hardness rating and is dried to 12 percent moisture for use as flooring. The janka hardness scale rates the hardness of hardwood flooring and bamboo as well. 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 grain is uniform and fine. 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.