Species: Okan / Denya


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Okan / Denya
Species profile
The heartwood is yellow brown and becomes red brown with air. The sapwood is clearly demarcated. The grain is interlocked and the texture is medium. It has an unpleasant odour when green.

The blunting effect is fairly high and peeling and slicing is not recommended or without interest. Requires power. It is sometimes difficult to obtain a good finish because of highly interlocked grain. Tendency to tear on quartersawn. Nailing is good but pre-boring is necessary. Gluing is correct for interior only. It dries slowly and kiln drying must be handled carefully.

Okan is very durable to fungi and is durable to dry wood borers; sapwood demarcated (risk limited to sapwood). Due to its high specific gravity and hardness, this species naturally covers the biological hazard class 5 (end-uses in marine environment or in brackish water).

Okan can be used for several applications such as:
• interior: e.g. flooring, sculpture, industrial or heavy flooring
• exterior: e.g. bridges, posts, sleepers, heavy carpentry, vehicle or container flooring

Substitute for Azobe (Lophira alata) and Greenheart (Ocotea rodiaei).

References
• CIRAD Forestry Department

Family:FABACEAE-MIMOSOIDEAE (angiosperm)
Origin:Africa
Local and common name(s)
Adoum, Bokoka, Bouemon, Oduma, Benya, Okan, African Greenheart, N' Duma, Edoum, Adadua, Denya,
Scientific name(s)
Cylicodiscus gabunensis,
Typical use
Hydraulic works (seawater), Sleepers, Heavy carpentry, Sculpture, Bridges (Parts in contact with water or ground), Flooring, Poles, Industrial or heavy flooring, Vehicle or container flooring, Turned goods, Bridges (Parts not in contact with water or ground),
Risk
Commercial restriction:
IUCN Red List status:
Appearance
Grain:Straigth or interlocked
Interlocked Grain:Marked
Sapwood:Clearly demarcated
Texture:Medium
Typical colour:Red Brown
Physical description
Crushing strength:82 (+/- 12) MPa
Specific Gravity (at 12% MC):0,91 (+/- 0,10)
Stability:Moderately stable to poorly stable
Static bending strength:134 (+/- 23) MPa
Strength class:
Durability
Dry wood borers:Class D - Durable
Fungi:Class 3 - Moderately durable
Termites:Class M - Moderately duarable
Treatability:Class 3 - Poorly permeable
References
Technical descriptions from the software Tropix 7 [1], with permission of the Research Unit Biomass, Wood, Energy, Bioproducts [2], CIRAD [3].

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Okan / Denya