1. Hence, the Strength of wood is determined with reference to the direction of the grain of the wood under load. Moisture is a useless and often harmful content in timber selected for use in any form of construction. Mechanical properties refer to the strength characteristics of wood. Colour: It should be uniform. Density Varies depending on species and moisture content. are indicated for each timber. Plane Table Surveying | Its Methods, Advantages & Disadvantages. Structural grading is the process by which timber is sorted into groups - or stress grades - with ideally, similar structural properties in each group. Fire resistance: A good timber should have high resistance to fire. This is because water in itself has no load-bearing capacity. Color: The lighter the color is, the weaker is the timber. All woods are porous to some extent. Shafiullah. 3. Its increased volume in the cell simply decreases the volume of the wood tissue. Followings are the physical and mechanical properties of timber: Colour; Appearance; Hardness The air seasoned woods can be made to lose further moisture by prolonged exposure (up to four years). Fire Resistance. Grains: In good timber grains are close. The general properties of timber can be listed as Colour: It should be uniform. Most important properties of wood and timber may be discussed under the following general headings. Hence, on wetting, the swelling starts quickly. Knots in the pine decrease the strength of the timber. The secret can be found in the many air pockets within the cellular structure of timber products, meaning that light weight timber is a better insulator as thermal conductivity increases with density. Mostly, however, the moisture content of many trees lies between 30-50 percent. Woods shows a good deal of variation in their Specific gravity. Here we have discussed both physical and mechanical properties of timber which affects timber quality. The properties of Timber Here at Forest we put a lot of care and attention into the manufacture of our products and we want you to enjoy them for many years to come. Radiata pine's sapwood is white to pale yellow, but often indistinguishable from the heartwood, which is light brown to yellow. As regards odor (smell), quite a few kind of woods are immediately identified by their characteristic smell. Factors to consider Timber is an integral material to many of our products, especially seating. This is because the high density of timber is a result of thicker cell walls, i.e., the greater amount of wood substance per unit volume. A laboratory test was carried out to develop the physical and mechanical properties (four-point bending test) of the timber species in accordance with EN 13153-1, ASTM D143 and EN 408. Hence, Mc values of natural (green) wood may sometimes be as high as 250 percent. Thus, shrinkage and swelling are related to the behavior of the cell wall of the wood tissue towards the water. Density: Higher the density of timber, greater will be its strength. TRANSVERSE OR BENDING STRENGTH: The most important use of timber as beams is based on the fact that wood has very high bending strength. Grain signifies arrangement and direction of fibers and vessels in the wood: parallel to the trunk, oblique to the trunk or turned and twisted with respect to the longitudinal direction of growth. This property is due to the (abundance) of interlocked fibers to provide strength. Timber is strong, light and reliable making timber construction simpler and safer than steel or concrete construction. Some varieties may be as light as 0.3 whereas, in other varieties of timber, the specific gravity may approach 0.9. Density: Higher the density stronger is the timber. As it is oven dried compression is, the Higher amount of water in itself has properties of timber capacity... 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properties of timber

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