Durability and Wood Preservation

(a) Durability Natural Wood Durability is defined as the durability of wood against wood destroying factors of biological groups. Natural durability is determined by extractive substances that are toxic to destructive factors before, so that by itself this natural durability will vary in accordance with variations in the number and type of extractive substances. This causes the natural durability varies ...

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Wood Preservatives

Preservatives are chemicals when incorporated (impregnated) into the timber will cause the wood becomes resistant to attack by wood destroying factors of biological groups. Wood becomes resistant (awt). Preservative that both must have the following properties: a) Characteristically Poison Preservative effectiveness depends on its toxic power or the ability of these materials to make the wood toxic to organisms-organisms that ...

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Early Discovery of Fire

This incident became the beginning of the creation of objects or containers made of clay with the help of fire. Clay when subjected to fire, then the chemical changes will occur, the wet clay becomes hard and retains its shape, which is still in shape despite exposed to water. With these results, so now people can store food materials. Although ...

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Types and Strength of Wood

a) Power Level Wood diprasaratkan power level is seen from strength persisted, flexural strength, and its density b) Level of Use There are five kinds of wood consumption levels: Level I and II: for the purposes of heavy constructions, unprotected and exposed to moist soil that is included in the first level are: teak, merban, bangkirai, purchase, resak, etc. Level ...

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Calculations Estimate Materials

Measurement Measuring wood is an activity by stretching meter above the wood to be measured between one point and another point so that the data obtained in the form of long-distance timber. Calculating wood is an activity that is conducted to determine the amount (volume) wood materials needed to make a wooden construction. We recommend that every unit of length ...

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Biological Factors Wood

Biological factors attack the wood for two things, ie wood as a food or as a residence. (1) Micro Organisms Fungi and bacteria, both also called micro-organisms and classified into four sections based on the nature of development in the wood and the shape of the damage. (2) Fungi Wood This fungus is the most important class of micro-organisms, because ...

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