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2. Janka hardness test - Wikipedia

   en.wikipedia.org/wiki/Janka_hardness_test

   For hardwood flooring, the test usually requires an 80 mm × 150 mm (3 in × 6 in) sample with a thickness of at least 6–8 mm, and the most commonly used test is the ASTM D1037. 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 ...

3. Wood flooring - Wikipedia

   en.wikipedia.org/wiki/Wood_flooring

   [4] Laminate and vinyl floors are often confused with engineered wood floors, but are not. Laminate flooring uses an image of wood on its surface, while vinyl flooring is plastic formed to look like wood. The several different categories of engineered wood flooring include: All-timber-wood floors made from multiple layers of sawn wood.

4. Juglans nigra - Wikipedia

   en.wikipedia.org/wiki/Juglans_nigra

   Juglans nigra, the eastern American black walnut, is a species of deciduous tree in the walnut family, Juglandaceae, native to central and eastern North America, growing mostly in riparian zones. Black walnut is susceptible to thousand cankers disease , which provoked a decline of walnut trees in some regions.

5. Walnut - Wikipedia

   en.wikipedia.org/wiki/Walnut

   Walnut hulls contain diverse phytochemicals, such as polyphenols, that stain hands and can cause skin irritation. Seven phenolic compounds, including ferulic acid, vanillic acid, coumaric acid, syringic acid, myricetin, and juglone, were identified in walnut husks; juglone had concentrations of 2-4% fresh weight. [3]

6. Juglans - Wikipedia

   en.wikipedia.org/wiki/Juglans

   Walnut trees are any species of tree in the plant genus Juglans, the type genus of the family Juglandaceae, the seeds of which are referred to as walnuts.All species are deciduous trees, 10–40 metres (33–131 ft) tall, with pinnate leaves 200–900 millimetres (7.9–35.4 in), with 5–25 leaflets; the shoots have chambered pith, a character shared with the wingnuts (Pterocarya), but not ...