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PREFAB BUILDINGS
BANGKIRAI
This page provides an overview of the timber species Bangkirai. Please see the end of this page for references.
According to Cirad (2003), the name Bangkirai is used only for woods importetd from Indonesia. Yellow Balau for woods from Indonesia. This name groups the species Shorea glauca, Shorea laevis and Shorea sup-genus Eushorea. Wagenführ (1996) sees only in Shorea obtusa and sub-genus Eushorea the timber Bangkirai/Balau Yellow. The following characteristics and properties vary greatly in literature.
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| Local names | Sal (Inda), Balau (Sarawak), Bangkirai (Indonesia), Selangan Batu (Sabah), Tang, Teng or Chan (Thailand), Gisok or Yakal (Philippines) |
| Distribution | Norhtindia (there also for deforestation), Thailand, Burma, Vietnam, Cambodia, Malaysia, Indonesia; In decidious monsoon forests. |
GENERAL CHARACTERISTICS |
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| Height | max. 28m (Wagenführ, 1996) max. 50m (Department of Foresty Agency for Forestry Research) |
| Clear bole | max. 20m (Wagenführ, 1996) 35m - 40m (Department of Foresty Agency for Forestry Research) |
| Bole diameter | max 0.8m (Wagenführ, 1996) max. 1.0m (Department of Foresty Agency for Forestry Research) |
| Thickness sapwood | 2cm - 8cm |
| Bark | The outer bark is grey, red or brown, sometimes even dark red with grooves and peels off in small thin pieces. |
| Color | The outer bark is grey, red or brown, sometimes even dark red with grooves and peels off in small thin pieces. |
| Texture | Wood texture ranges from fine to rather coarse |
| Grain | The Heartwood is brownish yellow, the sapwood yellowish pale light brown. |
PHYSICAL PROPERTIES |
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| Density | 900 kg/m3 |
| Total tangential shrinkage | 9.5% |
| Total radial shrinkage | 4.2% |
| Fibre saturation point | 23% |
| Stability | moderatly stable |
Based on mature heartwood, 12% moisture content.
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MECHANICAL PROPERTIES |
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| Crushing strenght | 68 N/mm2 |
| Bending strength | 125N/mm2 |
| Modulus of elasticitiy | 15000N/mm2 |
| based on mature heartwood; 12% moisture content | |
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DURABILITY |
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| Fungi | durable (class 2) |
| Termites | durable (class D) |
| Dry wood borer attack | Hardwood durable, sapwood not clearly demarcated; Requires appropriate preservative treatment |
In case of temporary or permanent humidification risk
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Does not require any preservative treatment. |
WORKING PROPERTIES |
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References
Cirad Tropics. (2003) Bangkirai http://tropix.cirad.fr/asia/bangkirai.pdf
Department of Foresty Agency for Forestry Research and Development Forest Product Research and Development Centre (1989) Indonesia Wood Atlas. Bogor. Indonesia.
Wagenführ, R. (1996): Holzatlas, Fachbuchverlag Leipzig.
Leipzig.