Wood, aspen beech

Differences in reactivity between wood species have been observed, which can be attributed to a number of factors. Rowell etal. (1986c) acetylated southern pine and aspen flakes under identical reaction conditions, and found that the softwood species exhibited a higher rate of reaction. Beckers and Militz (1994) performed a pilot-scale study of the acetylation of beech, eucalyptus, poplar, pine, Douglas fir and spruce, finding considerable differences in reactivity between the woods studied. 

In addition to pine, fir and spruce, the following woods are used, especially in countries to which these are indigenous, viz. aspen, poplar, lime, beech and willow, and to a more limited extent, alder-w<. Aspen wood, which comes mainly from Russia, is very easy to fiake and gives splints of uniform size. The strips of wood for match boxes are also made from the aspen tree and on the same machine. It is probable that for match splints aspen wood will supplant pine wood in this country. 

Out of about 30,000 woody plant species worldwide some 500 are regarded as timber available in a significant amount and are being traded internationally. 20-30 commercial wood species are commonly and typically used in Europe. The most important softwood species are spruce, pine, larch, fir and Douglas fir, and the most important hardwood species are beech, oak, aspen, birch, poplar, maple, lime, locust along with lesser available species, such as cherry or walnut. 

Eucalyptus wood Olive wood Oak bark Beech wood Birch wood Alder tree Quaking aspen Teak wood tree Black wattle tree Sisal tree trunk... 

---