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When testing wood in lumber form, the Janka test is always carried out on wood from the tree trunk (known as the heartwood), and the standard sample (according to ASTM D143) is at 12% moisture content and clear of knots. [3] The hardness of wood varies with the direction of the wood grain. Testing on the surface of a plank, perpendicular to the ...
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 ... In both groups there is an enormous variation in actual wood hardness, ... Different species of hardwood ...
Rinntech Resistograph for wood density analysis Resistograph is a mechanical resistance measurement device, developed by Frank Rinn (since 1986 in Heidelberg, Germany ). Driven by a drill motor, a long, thin needle is inserted into a wood log or structural wood beam in order to gain an idea of its density, often to identify areas of substandard ...
FSC Lesser Known Timber Species; NCSU Inside Wood project; Reproduction of The American Woods: exhibited by actual specimens and with copious explanatory text by Romeyn B. Hough; US Forest Products Laboratory, "Characteristics and Availability of Commercially Important Wood" from the Wood Handbook Archived 2021-01-18 at the Wayback Machine PDF ...
Download as PDF; Printable version ... This is a list of Acacia species (sensu lato) that are used for ... Approximate wood densities of acacia species; Species Density
The whole database contains materials from over 10,000 woody species and 200 plant families. Initiator for this wood anatomy database has been the American botanist and wood scientist Elisabeth Wheeler. The database contains two distinctive menus for specific anatomical features of modern wood species: Softwoods [6] Hardwoods [7]
The following table associates tree species, wood name and wood colour. The Dipterocarp timber classification system was developed by Colin Fraser Symington (1905-1943), a forester at the Malayan Forestry Service, and H. E. Desch, who researched comparative wood anatomy.