Wood

July 01, 2020

Wood

Wood is a porous and fibrous structural tissue found in the stems and roots of trees and other woody plants. It is an organic material – a natural composite of cellulose fibers that are strong in tension and embedded in a matrix of lignin that resists compression. Wood is sometimes defined as only the secondary xylem in the stems of trees,[1] or it is defined more broadly to include the same type of tissue elsewhere such as in the roots of trees or shrubs.[citation needed] In a living tree it performs a support function, enabling woody plants to grow large or to stand up by themselves. It also conveys water and nutrients between the leaves, other growing tissues, and the roots. Wood may also refer to other plant materials with comparable properties, and to material engineered from wood, or wood chips or fiber.




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Leather
Leather

July 01, 2020

Like silk or wool, leather is a fine, natural product. With leather, each hide is unique and features its own texture, color, and natural markings. There are even differences within a single hide. Therefore, it is not unusual to see color differences, grain changes, and even scars or brand marks on a piece of furniture. Different types of leather show these characteristics in different degrees, with some types of leather processed to eliminate these natural marks altogether and others left largely unprocessed to showcase them.

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Cast Iron
Cast Iron

July 01, 2020

Cast iron is a group of iron-carbon alloys with a carbon content more than 2%.[1] Its usefulness derives from its relatively low melting temperature. The alloy constituents affect its colour when fractured: white cast iron has carbide impurities which allow cracks to pass straight through, grey cast iron has graphite flakes which deflect a passing crack and initiate countless new cracks as the material breaks, and ductile cast iron has spherical graphite "nodules" which stop the crack from further progressing.

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