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2. Wood preservation - Wikipedia

   en.wikipedia.org/wiki/Wood_preservation

   Posts and poles can be treated directly on endangered areas, but should be treated at least 30 cm (0.98 ft) above the future ground level. The depth obtained during regular steeping periods varies from 5 to 10 mm (0.20 to 0.39 in) up to 30 mm (1.2 in) by sap pine.

3. Chromated copper arsenate - Wikipedia

   en.wikipedia.org/wiki/Chromated_copper_arsenate

   Chromated copper arsenate (CCA) is a wood preservative containing compounds of chromium, copper, and arsenic, in various proportions.It is used to impregnate timber and other wood products, especially those intended for outdoor use, in order to protect them from attack by microbes and insects.

4. Post and core - Wikipedia

   en.wikipedia.org/wiki/Post_and_core

   post only vs. with additional single-circle ring [15] In a classic case one of the best designs for a post to decrease the risk of failure is the narrowest and longest smooth, parallel post that one can fit into the post space. Utilizing the longest possible post ensures that the forces transmitted from the crown are distributed over as much of ...

5. Steel fence post - Wikipedia

   en.wikipedia.org/wiki/Steel_fence_post

   A steel fence post, also called (depending on design or country) a T-post, a Y-post, or variants on star post, is a type of fence post or picket. They are made of steel and are sometimes manufactured using durable rail steel. They can be used to support various types of wire or wire mesh. The end view of the post creates an obvious T, Y, or ...