It has the thin sapwood, less than 3cm and light color. The core has colors ranging from yellowish to reddish brown and red. The wood has little brightness and is soft to moderately hard to cut.
A major problem in eucalyptus wood is the formation of tyloses in the vessels of most species. They are responsible for the difficulty of drying and for the non-existent treatability of the wood.
The wood can be worked, facilitating cuts of surfaces, without great difficulties. The variations of the types of eucalyptus wood are enormous and very useful, ranging from light and low durability to those suitable for structural uses and relative durability.
Nowadays, in some companies, the eucalyptus are cloned from matrices selected and improved for specific use, such as, for example, high quality woods.
In more than 200 species of eucalyptus, it is observed, in most of them, the high resistance.
The first aspect observed in relation to eucalyptus resistance is the great variability along the radius or in the medulla-bark direction, in the trunk of wood, is related to the formation of juvenile wood that has inferior resistance to the adult one. The second aspect is the formation of a fragile core, which can occur in fast growing trees and larger diameters, which reduces, alarmingly, the resistance of the wood.
- Durability consists of resistance to physical, chemical and biological attacks.
- biological resistance: related to fungi, insects and marine borers;
- chemical resistance: related to acids and alkalis;
- physical resistance: resistance to environmental or climatic agents such as wind, rain, alternating humidity and radiation.
Biological agents are usually the most identified.
The resistance of wood is measured by the use of chemical compounds, called extractives. Those that give resistance to the wood are of phenolic character, with fungicidal properties and insecticides, always located in the core of the woods.
The deterioration of wood is caused by fungi and termites.
Eucalyptus wood is impervious to the use of treatment solutions. The alternative medium is in diffusion treatment with diffusible boron-based substances.
Use of eucalyptus wood
Eucalyptus forests must always be undergoing reforestation. They are important raw materials in Brazil and in the global economy.
The market for reforestation woods should be intensified, with the reduction of native wood from the Amazon region.
Construction: it is the second most expressive segment for the use of this wood. They are used in props, beams, rafters, slats, columns, in addition to components of fences;
- Rural constructions: the small rural producer can become self-sufficient by means of a small plantation in his property;
- Furniture: eucalyptus is widely used in the manufacture of furniture, Brazil being a very dynamic area in the export of these;
- Packaging: it is the sector that consumes more wood of serrated eucalyptus. There are approximately 300 packing plants in Brazil, these are divided into sub-segments;
- Playgrounds: is the use in its plump and preserved form;
- Wooden Artifacts: Sawn woods are used in toys, kitchen and kitchen articles, cages, tool handles, sporting and recreational items.
By Natália Mayrink De Lazzari