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wood-turning-wood-and-resin-500 Not less affected but more slowly affected. Talk to an Yurning Get advice on the latest products wood turning wood and resin 500 help with your projects. Box Making Thin Stock Hardwood. But those are the only similarities. Needs 48 hours to dry No guarantee of any kind. Then you can apply a sealant like this one by Rainguard which has excellent water resistance and long life.

Call: Log in Register. Wood Lathe Accessories. Wood Lathe Accessories Grouped here are the wood lathe accessories for mounting your work onto your lathes and tool rest systems to guide your woodturning tools.

Thanks for looking and if we can be of any help, please ask. Default sorting Sort by popularity Sort by average rating Sort by newness Sort by price: low to high Sort by price: high to low. Centre steady for Stratos XL. Centre Steady for the FU Chuck Reversing Adapter. Deluxe Live Centre. Wishlist Your wishlist is currently empty. Ordinary sap-staining is due to fungal growth, but does not necessarily produce a weakening effect. In heartwood it occurs only in the first and last forms.

Even oven-dried wood retains a small percentage of moisture, but for all except chemical purposes, may be considered absolutely dry. The general effect of the water content upon the wood substance is to render it softer and more pliable. A similar effect occurs in the softening action of water on rawhide, paper, or cloth. Within certain limits, the greater the water content, the greater its softening effect. Drying produces a decided increase in the strength of wood, particularly in small specimens.

An extreme example is the case of a completely dry spruce block 5 cm in section, which will sustain a permanent load four times as great as a green undried block of the same size will. The greatest strength increase due to drying is in the ultimate crushing strength, and strength at elastic limit in endwise compression; these are followed by the modulus of rupture, and stress at elastic limit in cross-bending, while the modulus of elasticity is least affected. Wood is a heterogeneous , hygroscopic , cellular and anisotropic material.

In coniferous or softwood species the wood cells are mostly of one kind, tracheids , and as a result the material is much more uniform in structure than that of most hardwoods. There are no vessels "pores" in coniferous wood such as one sees so prominently in oak and ash, for example. The structure of hardwoods is more complex. In discussing such woods it is customary to divide them into two large classes, ring-porous and diffuse-porous.

In ring-porous species, such as ash, black locust, catalpa , chestnut, elm , hickory, mulberry , and oak, [17] the larger vessels or pores as cross sections of vessels are called are localized in the part of the growth ring formed in spring, thus forming a region of more or less open and porous tissue.

The rest of the ring, produced in summer, is made up of smaller vessels and a much greater proportion of wood fibers. These fibers are the elements which give strength and toughness to wood, while the vessels are a source of weakness. In diffuse-porous woods the pores are evenly sized so that the water conducting capability is scattered throughout the growth ring instead of being collected in a band or row.

Examples of this kind of wood are alder , [17] basswood , [18] birch , [17] buckeye, maple, willow , and the Populus species such as aspen, cottonwood and poplar. In temperate softwoods, there often is a marked difference between latewood and earlywood. The latewood will be denser than that formed early in the season. When examined under a microscope, the cells of dense latewood are seen to be very thick-walled and with very small cell cavities, while those formed first in the season have thin walls and large cell cavities.

The strength is in the walls, not the cavities. Hence the greater the proportion of latewood, the greater the density and strength. In choosing a piece of pine where strength or stiffness is the important consideration, the principal thing to observe is the comparative amounts of earlywood and latewood. The width of ring is not nearly so important as the proportion and nature of the latewood in the ring. If a heavy piece of pine is compared with a lightweight piece it will be seen at once that the heavier one contains a larger proportion of latewood than the other, and is therefore showing more clearly demarcated growth rings.

In white pines there is not much contrast between the different parts of the ring, and as a result the wood is very uniform in texture and is easy to work. In hard pines , on the other hand, the latewood is very dense and is deep-colored, presenting a very decided contrast to the soft, straw-colored earlywood. It is not only the proportion of latewood, but also its quality, that counts. In specimens that show a very large proportion of latewood it may be noticeably more porous and weigh considerably less than the latewood in pieces that contain less latewood.

One can judge comparative density, and therefore to some extent strength, by visual inspection. No satisfactory explanation can as yet be given for the exact mechanisms determining the formation of earlywood and latewood.

Several factors may be involved. In conifers, at least, rate of growth alone does not determine the proportion of the two portions of the ring, for in some cases the wood of slow growth is very hard and heavy, while in others the opposite is true. The quality of the site where the tree grows undoubtedly affects the character of the wood formed, though it is not possible to formulate a rule governing it. In general, however, it may be said that where strength or ease of working is essential, woods of moderate to slow growth should be chosen.

In ring-porous woods, each season's growth is always well defined, because the large pores formed early in the season abut on the denser tissue of the year before. In the case of the ring-porous hardwoods, there seems to exist a pretty definite relation between the rate of growth of timber and its properties. This may be briefly summed up in the general statement that the more rapid the growth or the wider the rings of growth, the heavier, harder, stronger, and stiffer the wood.

This, it must be remembered, applies only to ring-porous woods such as oak, ash, hickory, and others of the same group, and is, of course, subject to some exceptions and limitations. In ring-porous woods of good growth, it is usually the latewood in which the thick-walled, strength-giving fibers are most abundant. As the breadth of ring diminishes, this latewood is reduced so that very slow growth produces comparatively light, porous wood composed of thin-walled vessels and wood parenchyma.

The latewood of good oak is dark colored and firm, and consists mostly of thick-walled fibers which form one-half or more of the wood. In inferior oak, this latewood is much reduced both in quantity and quality. Such variation is very largely the result of rate of growth. Wide-ringed wood is often called "second-growth", because the growth of the young timber in open stands after the old trees have been removed is more rapid than in trees in a closed forest, and in the manufacture of articles where strength is an important consideration such "second-growth" hardwood material is preferred.

This is particularly the case in the choice of hickory for handles and spokes. Here not only strength, but toughness and resilience are important. The effect of rate of growth on the qualities of chestnut wood is summarized by the same authority as follows:.

In the diffuse-porous woods, the demarcation between rings is not always so clear and in some cases is almost if not entirely invisible to the unaided eye.

Conversely, when there is a clear demarcation there may not be a noticeable difference in structure within the growth ring. In diffuse-porous woods, as has been stated, the vessels or pores are even-sized, so that the water conducting capability is scattered throughout the ring instead of collected in the earlywood.

The effect of rate of growth is, therefore, not the same as in the ring-porous woods, approaching more nearly the conditions in the conifers. In general it may be stated that such woods of medium growth afford stronger material than when very rapidly or very slowly grown. In many uses of wood, total strength is not the main consideration. If ease of working is prized, wood should be chosen with regard to its uniformity of texture and straightness of grain, which will in most cases occur when there is little contrast between the latewood of one season's growth and the earlywood of the next.

Structural material that resembles ordinary, "dicot" or conifer timber in its gross handling characteristics is produced by a number of monocot plants, and these also are colloquially called wood.

Of these, bamboo , botanically a member of the grass family, has considerable economic importance, larger culms being widely used as a building and construction material and in the manufacture of engineered flooring, panels and veneer.

Another major plant group that produces material that often is called wood are the palms. Of much less importance are plants such as Pandanus , Dracaena and Cordyline. With all this material, the structure and composition of the processed raw material is quite different from ordinary wood. The single most revealing property of wood as an indicator of wood quality is specific gravity Timell , [20] as both pulp yield and lumber strength are determined by it.

Specific gravity is the ratio of the mass of a substance to the mass of an equal volume of water; density is the ratio of a mass of a quantity of a substance to the volume of that quantity and is expressed in mass per unit substance, e.

The terms are essentially equivalent as long as the metric system is used. Upon drying, wood shrinks and its density increases. Minimum values are associated with green water-saturated wood and are referred to as basic specific gravity Timell Age, diameter, height, radial trunk growth, geographical location, site and growing conditions, silvicultural treatment, and seed source all to some degree influence wood density.

Variation is to be expected. Within an individual tree, the variation in wood density is often as great as or even greater than that between different trees Timell The following tables list the mechanical properties of wood and lumber plant species, including bamboo. Wood properties: [22] [23]. Bamboo properties: [24] [23]. It is common to classify wood as either softwood or hardwood. The wood from conifers e. These names are a bit misleading, as hardwoods are not necessarily hard, and softwoods are not necessarily soft.

The well-known balsa a hardwood is actually softer than any commercial softwood. Conversely, some softwoods e. There is a strong relationship between the properties of wood and the properties of the particular tree that yielded it.

The density of a wood correlates with its strength mechanical properties. For example, mahogany is a medium-dense hardwood that is excellent for fine furniture crafting, whereas balsa is light, making it useful for model building. One of the densest woods is black ironwood.

Aside from water, wood has three main components. It is mainly five-carbon sugars that are linked in an irregular manner, in contrast to the cellulose. Lignin confers the hydrophobic properties reflecting the fact that it is based on aromatic rings. These three components are interwoven, and direct covalent linkages exist between the lignin and the hemicellulose. A major focus of the paper industry is the separation of the lignin from the cellulose, from which paper is made.

In chemical terms, the difference between hardwood and softwood is reflected in the composition of the constituent lignin. Hardwood lignin is primarily derived from sinapyl alcohol and coniferyl alcohol. Softwood lignin is mainly derived from coniferyl alcohol.

Aside from the structural polymers , i. These compounds are present in the extracellular space and can be extracted from the wood using different neutral solvents , such as acetone. Generally, the softwood is richer in extractives than the hardwood.

Their concentration increases from the cambium to the pith. Barks and branches also contain extractives. Wood extractives display different activities, some of them are produced in response to wounds, and some of them participate in natural defense against insects and fungi. These compounds contribute to various physical and chemical properties of the wood, such as wood color, fragnance, durability, acoustic properties, hygroscopicity , adhesion, and drying.

Some extractives are surface-active substances and unavoidably affect the surface properties of paper, such as water adsorption, friction and strength. Extractives also account for paper smell, which is important when making food contact materials. Most wood extractives are lipophilic and only a little part is water-soluble. The concentrated liquid of volatile compounds extracted during steam distillation is called essential oil.

Distillation of oleoresin obtained from many pines provides rosin and turpentine. Most extractives can be categorized into three groups: aliphatic compounds , terpenes and phenolic compounds. Wood has a long history of being used as fuel, [37] which continues to this day, mostly in rural areas of the world.

Hardwood is preferred over softwood because it creates less smoke and burns longer. Adding a woodstove or fireplace to a home is often felt to add ambiance and warmth. Wood has been an important construction material since humans began building shelters, houses and boats. Nearly all boats were made out of wood until the late 19th century, and wood remains in common use today in boat construction. Elm in particular was used for this purpose as it resisted decay as long as it was kept wet it also served for water pipe before the advent of more modern plumbing.

Wood to be used for construction work is commonly known as lumber in North America. Elsewhere, lumber usually refers to felled trees, and the word for sawn planks ready for use is timber. Today a wider variety of woods is used: solid wood doors are often made from poplar , small-knotted pine , and Douglas fir.

New domestic housing in many parts of the world today is commonly made from timber-framed construction. Engineered wood products are becoming a bigger part of the construction industry. They may be used in both residential and commercial buildings as structural and aesthetic materials. In buildings made of other materials, wood will still be found as a supporting material, especially in roof construction, in interior doors and their frames, and as exterior cladding.

Wood is also commonly used as shuttering material to form the mold into which concrete is poured during reinforced concrete construction.

A solid wood floor is a floor laid with planks or battens created from a single piece of timber, usually a hardwood. Since wood is hydroscopic it acquires and loses moisture from the ambient conditions around it this potential instability effectively limits the length and width of the boards. Solid hardwood flooring is usually cheaper than engineered timbers and damaged areas can be sanded down and refinished repeatedly, the number of times being limited only by the thickness of wood above the tongue.

Solid hardwood floors were originally used for structural purposes, being installed perpendicular to the wooden support beams of a building the joists or bearers and solid construction timber is still often used for sports floors as well as most traditional wood blocks, mosaics and parquetry. Engineered wood products, glued building products "engineered" for application-specific performance requirements, are often used in construction and industrial applications.

Glued engineered wood products are manufactured by bonding together wood strands, veneers, lumber or other forms of wood fiber with glue to form a larger, more efficient composite structural unit. These products include glued laminated timber glulam , wood structural panels including plywood , oriented strand board and composite panels , laminated veneer lumber LVL and other structural composite lumber SCL products, parallel strand lumber , and I-joists.

Wood unsuitable for construction in its native form may be broken down mechanically into fibers or chips or chemically into cellulose and used as a raw material for other building materials, such as engineered wood, as well as chipboard , hardboard , and medium-density fiberboard MDF.

Such wood derivatives are widely used: wood fibers are an important component of most paper, and cellulose is used as a component of some synthetic materials.

Wood derivatives can be used for kinds of flooring, for example laminate flooring. Wood has always been used extensively for furniture , such as chairs and beds.

It is also used for tool handles and cutlery, such as chopsticks , toothpicks , and other utensils, like the wooden spoon and pencil. Further developments include new lignin glue applications, recyclable food packaging, rubber tire replacement applications, anti-bacterial medical agents, and high strength fabrics or composites. Moisture content electronic monitoring can also enhance next generation wood protection.

Wood has long been used as an artistic medium. It has been used to make sculptures and carvings for millennia. Examples include the totem poles carved by North American indigenous people from conifer trunks, often Western Red Cedar Thuja plicata. Many types of sports equipment are made of wood, or were constructed of wood in the past. For example, cricket bats are typically made of white willow. The baseball bats which are legal for use in Major League Baseball are frequently made of ash wood or hickory , and in recent years have been constructed from maple even though that wood is somewhat more fragile.

NBA courts have been traditionally made out of parquetry. Many other types of sports and recreation equipment, such as skis , ice hockey sticks , lacrosse sticks and archery bows , were commonly made of wood in the past, but have since been replaced with more modern materials such as aluminium, titanium or composite materials such as fiberglass and carbon fiber. One noteworthy example of this trend is the family of golf clubs commonly known as the woods , the heads of which were traditionally made of persimmon wood in the early days of the game of golf, but are now generally made of metal or especially in the case of drivers carbon-fiber composites.

Little is known about the bacteria that degrade cellulose. Symbiotic bacteria in Xylophaga may play a role in the degradation of sunken wood. Alphaproteobacteria , Flavobacteria , Actinobacteria , Clostridia , and Bacteroidetes have been detected in wood submerged for over a year. From Wikipedia, the free encyclopedia. Redirected from Heartwood. Fibrous material from trees or other plants. For a small forest, see woodland.

For wood as a commodity, see timber. For other uses, see wood disambiguation , wooden disambiguation , or heartwood disambiguation. This article needs additional citations for verification. Please help improve this article by adding citations to reliable sources.

Unsourced material may be challenged and removed. Record, The Mechanical Properties of Wood [9]. This section needs additional citations for verification.

August Learn how and when to remove this template message. See also: Janka hardness test. Main article: Wood fuel. Main article: Wood flooring. Main article: Engineered wood.

Trees portal. Cambridge University Press. August 12, Archived from the original on August 13, Retrieved August 12, Bibcode : Sci PMID S2CID Archived from the original on March 29, Retrieved March 28, PMC The Mechanical Properties of Wood. Shigo and Trees, Associates.

The term heartwood derives solely from its position and not from any vital importance to the tree as a tree can thrive with heart completely decayed.

Archived from the original on March 13, Archived from the original on August 10, JSTOR The mechanical properties of wood, including a discussion of the factors affecting the mechanical properties, and methods of timber testing. Department of Agriculture, Forest Products Laboratory. General Technical Report Madison, WI. Compression wood in gymnosperms. Springer-Verlag, Berlin. Wood density in conifers.

Commonwealth For. Bureau, Oxford, U. Madison, WI: U. Retrieved November 3, Retrieved November 2, ISBN Boerjan; J. Ralph; M. Baucher June Plant Biol. Pulp and Paper Chemistry and Technology.

Volume 1, Wood Chemistry and Wood Biotechnology. Berlin: Walter de Gruyter. Wood Chemistry: Fundamentals and Applications Second ed. San Diego. Wood Composites.

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