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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

   Generally, older solid hardwood floors need to be buffed every 3–5 years. The process usually takes about one day. Buffing refers to the process of using a stand up floor buffer. The floor is abraded with 180 grit screen on the buffer. This allows for the new coat of finish to mechanically adhere to the floor.

4. Spalting - Wikipedia

   en.wikipedia.org/wiki/Spalting

   Spalting is divided into three main types: pigmentation, white rot, and zone lines.Spalted wood may exhibit one or all of these types in varying degrees. Both hardwoods and softwoods can spalt, but zone lines and white rot are more commonly found on hardwoods due to enzymatic differences in white rotting fungi.

5. Carya glabra - Wikipedia

   en.wikipedia.org/wiki/Carya_glabra

   Carya glabra, the pignut hickory, is a common, but not abundant species of hickory in the oak-hickory forest association in the Eastern United States and Canada. Other common names are pignut , sweet pignut , coast pignut hickory , smoothbark hickory , swamp hickory , and broom hickory .

6. Hickory - Wikipedia

   en.wikipedia.org/wiki/Hickory

   [5] Hickory flowers are small, yellow-green catkins produced in spring. They are wind-pollinated and self-incompatible. The fruit is a globose or oval nut, 2–5 cm (0.8–2.0 in) long and 1.5–3 cm (0.6–1.2 in) diameter, enclosed in a four-valved husk, which splits open at maturity.

7. Tongue and groove - Wikipedia

   en.wikipedia.org/wiki/Tongue_and_groove

   The tongue may or may not be of the same material as the grooved pieces joined by the tongue. For example, plywood flooring is commonly grooved at the edges, and plastic tongues are used to form the joint. In old sailor slang vernacular, a "tonguin" (pronounced / t ə ŋ ɪ n /) can refer to repairs made to a boat of tongue and groove construction.