Janka Hardwood Scale Acacia

You can read more about the janka scale and see a list of the janka hardness ratings from findanyfloor here.

Janka hardwood scale acacia.

The janka hardness scale determines the hardness of a particular type of wood over another. The janka hardness test measures the lb in2 required to embed a 444 inch steel ball to half its diameter in wood. 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 janka rating indicates wood strength measured by the force necessary to drive a 444 millimeter steel ball halfway into a plank.

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. For example mahogany has a janka hardness of 800 lbf and brazilian walnut has a janka hardness of 3 680 lbf. The janka hardness scale rates the hardness of hardwood flooring and bamboo as well. The grain is uniform and fine.

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. Raspberry jam acacia has a janka hardness rating of 3100 and a very low 5 4 percent volumetric shrinkage rate. 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. Below is an illustration that shows what the janka hardness test looks like.

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. It is one of the best measures of the ability of a wood species to withstand denting and wear.