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Janka rating australian hardwood.
It measures the force required to embed an 11 28 millimetres 0 444 in diameter steel ball halfway into a sample of wood.
The janka rating is a measure of the wood to resist indentation.
Australian hardwood timbers are among some of the world s hardest by the internationally recognised and uiversally adopted janka hardness ratings.
The janka hardness scale is a test used to determine the hardness and density of a hardwood timber and bamboo floor.
A janka rating is a rating largely used by the timber flooring industry to compare the hardness of a floor.
Hardness is expressed in kilo newtons.
This is done by testing the floor s resistance by measuring how much pressure is needed to embed an 11 28 millimetre ballbearing halfway into the boards surface.
Rating janka 1 7 1 5 7 4 9 5 7 7 5 10 11 9 1 to 9 5 13 to 14 8 8 to 13 9 0 7 2 8 6 moe gpa 1 15 13 15 13 17 17 23 14 to 19 16 to 24 13 to 15 18 22 18 mor mpa 1 118 117 110 117 122 130 150 140 to 144 118 to 181 89 to 115 140 135 147 shrinkage rad tan 1.
The hardness of a timber is measured by the janka hardness test.
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.
This test measures the force required to embed an 11 28mm 0 444 in steel ball to half its depth into wood.
The higher the janka rating number the greater the hardness.
Technically the test involves pushing an 11 18mm diameter steel ball into wood fibre until it reaches half of the diameter of the ball.
It is one of the best measures of the ability of a wood species to withstand denting and wear.
The janka hardness test is the hardness level given to each species.
28 stunning high janka rating hardwood flooring malibu wide plank french oak salt creek 3 8 in t x 6 1 2 in w x.
Just as some people have the genetics that allow them to run fast jump high run long distances or bench press heavy weights species of timber also have genetic dispositions that allow them to withstand intense heat humidity high traffic high.
What is a janka rating.
Even though a janka rating of 8 is considered hard many australian timber species achieve ratings of 12 and above.
The janka hardness test from the austrian born emigrant gabriel janka 1864 1932 measures the resistance of a sample of wood to denting and wear.
In general terms a medium density timber will have a janka rating of 4 to 8 whilst a high density timber achieves a rating of 8.
A common use of janka hardness ratings is to determine whether a species is suitable for use as flooring.
The force used is then measured in kn kilonewton as the janka rating.
