The main distribution of commercially used oak is central Europe. There are two species of oak which are assessed together (Quercus robur and Quercus petraea). The appearance of the wood texture of both species however is the same. Differences can be seen anatomically, however, not quite accurately. Hybrids of both species are widely spread. Oak trees can reach a height of up to 40m and diameters of more than 2 meters.
Application of Oak
Big diameter oak logs are preferably used in the veneer industry. Oak lumber is mainly used for furniture, flooring, joinery as well as construction lumber. Moreover, oak is used for the production barrels are used for processing wine and liquor to get a unique taste caused by tannin.
Characteristic of Oak
The heartwood colour is light to medium brown. Nearly white to light brown sapwood is not always sharply demarcated from the heartwood. Quarter sawn sections display prominent ray patterns. Good results with hand and machine tools. Oak has a moderately high shrinkage value, resulting in moderate dimensional stability, especially in flatsawn boards. It can react with iron (particularly when wet) and cause staining and discoloration.
Gross density: (12-15%): 450 – 690 – 960 kg/m³
Compressive strength: 50 – 65 – 75 N/mm²
Bending strength: 75 – 85 – 110 N/mm²