ONZABILI (Antrocaryon micraster)
Trade Name
Onzabili
Scientific Name
Antrocaryon micraster A.Chev. et Guillaum.
Family
ANACARDIACEAE
Common Names
Bitri (Guinea); Akoua (Côte d`Ivoire); Anguekong (Equatorial Guinea); N'gongo (Congo); N'gongo (Angola); Tshitoke; Tshinsono; Tshimumbu; Tshimanya; Tshikosokoso; Ngongo; Mumbu; Kuminimba; Ha-okete; Bougongi; Antrocaryon; Akoua; Mongongo (Portugal); Aprokuma (Ghana); N`gongo (Angola); Mugongo (Zaire); Onzabili (Gabon); Angufkong (Equatorial Guinea); Angonga (Cameroon)
Scientific Name Synonyms
Antrocaryon polyneurum Mildbr.
Description Of The Tree
Botanical Description
The bole is up to 32 m in length, with trunk diameters usually up to 130 cm. The tree is unbuttressed.
Natural Habitat
Antrocaryon micraster occurs scattered throughout semi-deciduous forests and sporadically in evergreen forests in tropical Africa.
Natural Distribution
West and Central Africa, from Sierra Leone to the Democratic Republic of the Congo.
Wood Identification
Anatomic Description Of Wood
Wood diffuse porous. Occasionally vessels exclusively solitary (over 90%). Tangential diameter of vessel lumina 150 to 200 micras (medium). Tyloses thin walled. Non-vestured pits. Vessels per mm2 6 to 10 (medium). Simple perforation plates. Vessel-ray pits simil Paratracheal axial parenchyma scanty and/or vasicentric. 4 to 10 rays per mm (medium). Rays non-storied. Rays 1 to 4 seriate. Body ray cells procumbent with mostly 2 to 4 rows of upright and/or square marginal cells (Kribs-II). Septate fibers present. Fibers with simple to minutely bordered pits.
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Wood Macro Photo Radial Plane
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Wood Micro Photo Of Transversal Section
Availability
Cites Status
Unrestricted
General Wood Description
Color
The sapwood is greyish white. The heartwood is pinkish white to red brown, it is hardly demarcated from heartwood. The silver figure is fine.
COLOR INDEX (1=Black, 7=Light yellow,white)
5
Grain
Straight or slightly interlocked, sometimes with an influence on further processing operations.
Texture
Medium texture is reported in this species.
Luster
The wood is described as low in luster.
Natural Durability
Not durable; important risks of decay attacks at any processing step, from logs up to final products. It must receive preservative treatment. Sensible to termites attack. Heartwood is sensible to Lyctus attacks.
Natural durability index (1= Very high durability, 7=Vey low durability)
5
Internal Growth Stresses
No residual growth stresses are found.
Resistance To Impregnation
Moderately easy to treat with a partial penetration of the preservative products.
Wood Physical Properties
Basic Density or Specific Gravity (O.D. weight/vol. green) (g/cm³)
0.48
Air-dry Density (Weight and volume at 12%MC) (g/cm³)
0.52
Total shrinkage Tangential (Saturated to 0%MC) (%)
7.4
Total shrinkage Radial (Saturated to 0%MC) (%)
4.7
Drying Defects
Ease of Drying: Drying is moderately easy; some particular care is needed. Drying Defects: Risks of discoloration caused by decay Kiln Schedules: The kiln schedule has been tested.
Recommended Dry Kiln Schedule
FR-8
Dimensional stability ratio (Total Tangential Shrinkage %/Total Radial Shrinkage %)
1.6
Wood Chemical Properties
Wood Mechanical Properties
Bending Strength (MOR),12%MC (kgf/cm²)
896
Stiffness (MOE) 12%MC (kgf/cm²)
136400
Compression parallel to fiber 12%MC (kgf/cm²)
493
Compression perpendicular to fiber 12%MC (kgf/cm²)
61
Shear strength radial 12%MC (kgf/cm²)
84
Janka hardness (side) 12%MC (kgf)
331
Janka hardness (end grain) 12%MC (kgf)
434
Workability
Sawing
It is easy to saw.
Rotary Veneer Cutting
Suitable for slicing, also suitable for peeling if treated.
Sliced Veneer
Suitable for slicing, also suitable for peeling if treated.
Blunting Effect
Slight blunting effect; ordinary tools can be used for sawing and machining.
Machining
Machining of this species is reportedly easy.
Planing
Moderately easy; tools must be cautiously sharpened.
Moulding
Moderately easy; tools must be cautiously sharpened.
Boring
Moderately easy; tools must be cautiously sharpened.
Mortising
Moderately easy; tools must be cautiously sharpened.
Nailing
No particular problem.
Gluing
Glues well if basic gluing technical rules are followed.
Sanding
Easy to perform; it gives good results.
Polishing
Can be polished without surface preparation.
Steam Bending
This species can be used for steam bending.
Response To Hand Tools
No particular problems.
REFERENCED USES
End Uses Summary
HOUSING GENERAL, beams, joists, boards, frames, steps, panelling, fittings, FURNITURE AND CABINETS, common furniture, PLYWOOD AND VENEER, faces, cores, common veneer, PACKING, heavy packing, pallets, OTHER AND MUSICAL INSTRUMENTS, door core, coffin, moldings
General Housing
- 10 - Silica in Timbers
Beams
- 11 - Prospect: The wood database
Joists
- 12 - Tropical timbers of the world. Part I-Tropical American Species
Boards
- 13 - Dry kiln schedules for commercial woods. Temperate and tropical. Section III. Latin American (Mexico, Central, and South America) Woods–Conventional Temperatures
Frames
- 16 - Woods of the World
Steps
- 17 - Tree Conservation Database
Paneling
- 18 - W3TROPICOS Missouri Botanical Garden
Fittings
- 19 - Silica in Timbers
Furniture Cabinets
- 21 - Tropical timbers of the world. Part III-Southeast Asian and Oceanian Species.
Furniture, Common
- 23 - Handbook of Hardwoods
Panels, Veneers
- 25 - Directory of Timber Trade Malaysia
Faces
- 26 - Annual Review and Assessment of the World Timber Situation 1998-ITTO
Cores
- 27 - Embassy of Brazil in Japan
Common Veneer
- 29 - Embassy of Ecuador in Japan
Packing
- 45 - Recopilación y Análisis de Estudios Tecnológicos de Maderas Peruanas
Heavy Packing
- 47 - Arvores Brasileiras
Pallets
- 48 - The strength properties of timbers
Door Cores
- 76 - Descripción General y Anatómica de 105 Maderas del Grupo Andino.
Coffin
- 78 - Amazonian Timbers for the International Market
Molding
- 79 - Padronização da Nomenclatura Comercial Brasileira das Madeiras Tropicais Amazônicas, Sugestão
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