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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 ...
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 ...
The tree is essentially evergreen throughout most of its native range. It is shade-tolerant. It fruits between the age of 30 and 70 years over the summer months in the Northern Hemisphere. [3] The wood is hard, heavy and self-lubricating, and has a Janka Hardness Score of 4500, [8] which is one of the hardest in the
Red oak rings in at a 1290 on the Janka scale (the higher the number, the stronger the board), and white oak comes in at 1360. Durability: Thanks to the wood’s open grain, wood stains take ...
Bead-tree, white cedar, Persian lilac (Melia azedarach) Maple (Acer) Hard maple Sugar maple (Acer saccharum) Black maple (Acer nigrum) Soft maple Boxelder (Acer negundo) Red maple (Acer rubrum) Silver maple (Acer saccharinum) European maple Sycamore maple (Acer pseudoplatanus) Marblewood (Marmaroxylon racemosum) Marri, red gum (Corymbia calophylla)
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The cost to treat a tree is going to be less than the cost to have a dead tree removed, not counting the value of unrecoverable ecological services if hemlocks disappear from our urban forest in Erie.
The wood is very hard, measuring 5.6 on the Brinell scale and 2,350 lbf (10,500 N) on the Janka scale, approximate measurements of hardness. For comparison, Douglas fir measures 660 lbf (2,900 N), white oak 1,360 lbf (6,000 N), and Brazilian walnut 3,800 lbf (17,000 N) on the Janka scale. It features a tan to salmon color with black accent ...