Dose density
The kiln density describes the average gross density of dry wood , i.e. at 0% wood moisture :
The average density because the gross density fluctuates between the individual growth zones (annual rings) and individual areas in the wood (e.g. pressure wood , tension wood). It also varies not only between the species, but also with the growing conditions and the proportion of early and late wood .
The distinction between softwood and hardwood is based on this value, which originally comes from customs:
- Hardwood : The highest Darrdichte has lignum vitae with an average of 1.2 g / cm³ (= 1200 kg / m³).
- Softwood : . Balsa wood has the lowest kiln density with an average bulk density of 0.12 to 0.3 g / cm³ (= 120–300 kg / m³).
Hardwood and softwood are therefore not to be equated with hardwood and softwood, as is often assumed.
Tree species | Density [g / cm 3 ] at 12% water content (air dry ) |
Bulk density [g / cm 3 ] |
Daring density [g / cm 3 ] |
|
---|---|---|---|---|
Balsa | 0.13 | very easy | ||
Black poplar | 0.41 | light | ||
Silver fir | 0.41 | |||
Spruce | ~ 0.47 | 0.33-0.75 | 0.43 | moderately easy |
Douglas fir | 0.47 | |||
jaw | 0.52 | 0.33-0.89 | 0.49 | |
larch | 0.60 | 0.44-0.85 | 0.55 | |
Oak | 0.70 | 0.43-0.96 | 0.65 | moderately difficult |
beech | 0.73 | 0.54-0.91 | 0.68 | |
Hornbeam | 0.79 | heavy | ||
Bongossi | 1.04 | very difficult | ||
Pockwood | 1.23 |
Attention: There is a risk of confusion between the terms raw and true density . The latter indicates the density of the pure, void-free cell wall. The true density of all types of wood is relatively constant at approx. 1.5 g / cm³.
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See also
Web links
Individual evidence
- ↑ Softwood furniture. In: Sunchairs GmbH & Co. KG, 04229 Leipzig, massivum.de. 2020, accessed on May 13, 2020 .
- ↑ Darrdichte. In: Heinze GmbH, 10707 Berlin, baunetz.de. 2020, accessed on May 13, 2020 .
- ↑ a b Construction chemistry and building materials: wood. In: Univ.-Prof. Dr.-Ing. K.-Ch. Thienel, Institute for Construction Materials, Faculty of Civil Engineering and Environmental Sciences, University of the Federal Armed Forces, Munich. 2016, accessed May 13, 2020 .