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The Janka hardness test (English: / ˈ dʒ æ ŋ k ə /; [1] German:), created by Austrian-born American researcher Gabriel Janka (1864–1932), measures the resistance of a sample of wood to denting and wear. [citation needed] It measures the force required to embed an 11.28-millimeter-diameter (7 ⁄ 16 in) steel ball halfway into a sample of ...
Download as PDF; Printable version; In other projects Wikidata item; Appearance. ... The Brinell scale; The Janka hardness test; The Rockwell scale; The Durometer scale;
Lignum vitae is hard and durable, and is also the densest wood traded (average dried density: ~79 lb/ft 3 or ~1,260 kg/m 3); [4] it will easily sink in water. On the Janka scale of hardness, which measures hardness of woods, lignum vitae ranks highest of the trade woods, with a Janka hardness of 4,390 lbf (compared with Olneya at 3,260 lbf, [5] African blackwood at 2,940 lbf, hickory at 1,820 ...
Download as PDF; Printable version; In other projects Wikidata item; ... Mohs scale of mineral hardness; Mohs hardness of materials (data page) Vickers hardness test;
A variety of hardness-testing methods are available, including the Vickers, Brinell, Rockwell, Meyer and Leeb tests. Although it is impossible in many cases to give an exact conversion, it is possible to give an approximate material-specific comparison table for steels .
Download as PDF; Printable version; ... In both groups there is an enormous variation in actual wood hardness, ... Janka hardness test; Brinell scale;
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Its wood has a similar feel and similar tonal attributes to genuine rosewoods, but is near 1000 points softer on the Janka hardness scale on average or more than all of the commonly traded species of rosewood except for Sisso and Amazonian rosewood (Dalbergia spruceana). It also ranks lower in density of 5-10 lbs per cubic foot compared to ...