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  2. Janka hardness test - Wikipedia

    en.wikipedia.org/wiki/Janka_hardness_test

    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 ...

  3. Hardnesses of the elements (data page) - Wikipedia

    en.wikipedia.org/wiki/Hardnesses_of_the_elements...

    Download as PDF; Printable version; ... Mohs hardness [1] Vickers hardness (MPa) [1] Brinell hardness ... Mohs scale of mineral hardness;

  4. Category:Hardness tests - Wikipedia

    en.wikipedia.org/wiki/Category:Hardness_tests

    Download as PDF; Printable version; In other projects ... Category lists tests, methods and scales that measure hardness of a material. Subcategories. This category ...

  5. Hardness - Wikipedia

    en.wikipedia.org/wiki/Hardness

    Two scales that measures rebound hardness are the Leeb rebound hardness test and Bennett hardness scale. Ultrasonic Contact Impedance (UCI) method determines hardness by measuring the frequency of an oscillating rod. The rod consists of a metal shaft with vibrating element and a pyramid-shaped diamond mounted on one end. [4]

  6. Mohs scale - Wikipedia

    en.wikipedia.org/wiki/Mohs_scale

    Mohs hardness kit, containing one specimen of each mineral on the ten-point hardness scale. The Mohs scale (/ m oʊ z / MOHZ) of mineral hardness is a qualitative ordinal scale, from 1 to 10, characterizing scratch resistance of minerals through the ability of harder material to scratch softer material.

  7. Lignum vitae - Wikipedia

    en.wikipedia.org/wiki/Lignum_vitae

    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 ...

  8. Hardness scales - Wikipedia

    en.wikipedia.org/wiki/Hardness_scales

    Download as PDF; Printable version; In other projects ... move to sidebar hide. Hardness scales may refer to: Methods of measuring mineral hardness . Scratch hardness ...

  9. Hardwood - Wikipedia

    en.wikipedia.org/wiki/Hardwood

    As the name suggests, the wood from these trees is generally harder than that of softwoods, but there are significant exceptions. In both groups there is an enormous variation in actual wood hardness, with the range in density in hardwoods completely including that of softwoods; some hardwoods ( e.g. , balsa ) are softer than most softwoods ...