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OVOGA (Poga oleosa)
Trade Name
Ovoga
Scientific Name
Poga oleosa Pierre
Family
ANISOPHYLLEACEAE
Common Names
Enoi (Nigeria); Poga (United Kingdom); Afo (Equatorial Guinea); Angalé (Cameroon); Poga enoi; Poga; Pobo; Ovovo; Onyo; Okeco; Nyore; Nyare; Njove; Njole; Ngal?; Muleko; Muguba; Mpoi; Mpfo; Mfo; M`pongou?; M`poga; Inyere; Inoye; Inoi nut; Inoi; Imonor; Imonon; Imono; Iku; Ikoi; Emyu; Ekom; Bonyor; Avoga; Angale; African brazil nut; Afo (Gabon); Ovoga (Gabon); Ngale (Cameroon)
Description Of The Tree
Botanical Description
The tree reaches a height of 50 m, with trunk diameters up to 130 cm. The bole is cylindrical and straight, from 16 to 20 m in length.
Natural Habitat
Poga oleosa is reported in the dense equatorial forests, often along riverbanks and coastal areas.
Natural Distribution
Distributed from Nigeria to the Democratic Republic of the Congo.
Wood Identification
Anatomic Description Of Wood
Wood diffuse porous. Vessels solitary and in short radial multiples. Tangential diameter of vessel lumina 200 micras or more (large). Non-vestured pits. Vessels per mm2 less than 6 (rare). Simple perforation plates. Vessel-ray pits similar to intervessel pits i Axial parenchyma aliform. Non-crystals in axial parenchyma cells. Over 9 cells per parenchyma strand. Rays less than 4 per mm (rare). Rays of two distinct sizes. Rays non-storied. Larger rays more than 4 seriate. Rays exclusively uniseriate. Heterogeneous rays and/or multiseriate heterogeneous rays. Non-septate fibers. Fibers with simple to minutely bordered pits.
Availability
Cites Status
Unrestricted
General Wood Description
Color
The sapwood is white or grey with pink stripes, it has a thickness of 2.5 to 5 cm. The heartwood is pink-red or pink-buff, it is clearly demarcated.
COLOR INDEX (1=Black, 7=Light yellow,white)
5
Grain
Straight or slightly interlocked, sometimes with an influence on further processing operations.
Texture
The wood is mostly coarse in texture.
Natural Durability
Moderately durable to decay. Without preservative treatment, this species can be used only under risk of occasional re-humidification. It is not suited for uses with risks of permanent or long-lasting humidification. Sensible to termites attack. The heart
Natural durability index (1= Very high durability, 7=Vey low durability)
3
Internal Growth Stresses
Residual stresses are reported to be absent.
Silica Content
Silica Content: It is reported to have a negligible amount of silica. Contents over 0.05% may affect wood processing. Silica Value: 0.01
Resistance To Impregnation
Easy to treat with a full penetration of the preservative products using vacuum-pressure method.
Wood Physical Properties
Basic Density or Specific Gravity (O.D. weight/vol. green) (g/cm³)
0.44
Air-dry Density (Weight and volume at 12%MC) (g/cm³)
0.47
Total shrinkage Tangential (Saturated to 0%MC) (%)
7.3
Total shrinkage Radial (Saturated to 0%MC) (%)
2.7
Drying Defects
Ease of Drying: Drying is rather slow and sometimes difficult to perform. Drying Defects: Risks of distortions. Kiln Schedules: Schedule proposed as a reference by comparison with well known species taking into account to the general technological behavior of this species.
Recommended Dry Kiln Schedule
FR-8
Dimensional stability ratio (Total Tangential Shrinkage %/Total Radial Shrinkage %)
2.7
Wood Chemical Properties
Wood Mechanical Properties
Bending Strength (MOR),12%MC (kgf/cm²)
641
Stiffness (MOE) 12%MC (kgf/cm²)
94986
Compression parallel to fiber 12%MC (kgf/cm²)
389
Compression perpendicular to fiber 12%MC (kgf/cm²)
44
Shear strength radial 12%MC (kgf/cm²)
70
Janka hardness (side) 12%MC (kgf)
267
Janka hardness (end grain) 12%MC (kgf)
366
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
Easy; no particular problems.
Moulding
Rather difficult; special tools are needed.
Boring
Rather difficult; special tools are needed.
Mortising
Rather difficult; special tools are needed.
Nailing
No particular problem.
Gluing
Glues well if basic gluing technical rules are followed.
Sanding
Easy to perform; it gives good results.
Polishing
Needs pre-coating.
Response To Hand Tools
No particular problems.
REFERENCED USES
End Uses Summary
HOUSING GENERAL, beams, joists, boards, frames, steps, panelling, fittings, shutter boards, FURNITURE AND CABINETS, common furniture, PLYWOOD AND VENEER, faces, Decorative veneer, PACKING, heavy packing, pallets, OTHER AND MUSICAL INSTRUMENTS, door core, coffin, moldings, cementboard
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
Shutter Boards
- 20 - Prospect: The wood database
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
Decorative veneer
- 28 - Ministry of Agriculture, Fisheries & Forest of Fiji
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
Cementboard
- 81 - Madeiras da Amazônia: descrição do lenho de 40 espécies ocorrentes na Floresta Nacional do Tapajós
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