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OZOUGA (Sacoglottis gabonensis)
Trade Name
Ozouga
Scientific Name
Sacoglottis gabonensis Urb.
Family
HUMIRIACEAE
Common Names
Kpowuli (Sierra Leone); Tala (Nigeria); Akouapo (Côte d`Ivoire); Ozouga (Gabon); Essoua (Gabon); Niuka (Congo); Bidou (Cameroon); Wuwe; Ugu; Tssoua; Toboe; Tiabutuo; Tala; Ozouga; Ozongo; Osonga; Okpi-uta; Ntala; Niouka; Ndat; Nche; Mosouhouga; Mahogany; Kwuo; Kpo-wuli; Itala; Issoua; Ioon; Illouye; Idon; Gbokone; Fuale; Fawire; Esua; Essoua; Eruk; Eloue; Efuanle; Edoue; Edat; Doh; Dewe; Dauh; Cherry; Boboua; Bitter bark; Bidou; Bebvo; Attalla; Atala; Amuan; Akouapo; Afamkokoo
Scientific Name Synonyms
Aubrya gabonensis Baill.
Description Of The Tree
Botanical Description
The tree reaches a height of 23 m. The bole is well formed, with small buttresses or buttresses are present on occasion. The trunk diameter attains 70 to 100 cm.
Natural Habitat
Sacoglottis gabonensis prefers swampy forests and riversides or high rainfall areas. However in Gabon, it may be found in closed, dry forests on sandy soils.
Wood Identification
Anatomic Description Of Wood
Wood diffuse porous. Vessels exclusively solitary (over 90%). Tangential diameter of vessel lumina 100 to 150 micras (small). Vessels per mm2 10 to 20 (abundant). Scalariform perforation plates with 5 to 15 bars. Vessel-ray pits coarse throughout the ray cell. Apotracheal axial parenchyma diffuse and/or diffuse in aggregates. Paratracheal axial parenchyma scanty and/or vasicentric. Prismatic crystals in chambered axial parenchyma cells and/or in fibers. Over 9 cells per parenchyma strand. Rays more than 10 per mm (abundant). Rays non-storied. Rays 1 to 2 seriate. Heterogeneous rays and/or multiseriate heterogeneous rays. Non-septate fibers. Fibers with distinctly bordered pits.
Availability
Cites Status
Unrestricted
General Wood Description
Color
The heartwood is purple-red or medium brown, it is not clearly demarcated. The silver figure is subdued.
COLOR INDEX (1=Black, 7=Light yellow,white)
4
Grain
Straight or interlocked, sometimes with an influence on further processing operations. Interlocked grain is high but not frequent.
Texture
The wood is mostly medium in texture.
Luster
Luster is usually low.
Natural Durability
Very durable to decay; without preservative treatment. This species is especially suited for all the uses with risks of permanent or long-lasting humidification. Resistant to termites attack. Heartwood is resistant to Lyctus attacks.
Natural durability index (1= Very high durability, 7=Vey low durability)
1
Internal Growth Stresses
Residual growth stresses are absent.
Resistance To Impregnation
Nearly impossible to treat with a too much low penetration of the preservative substances.
Wood Physical Properties
Basic Density or Specific Gravity (O.D. weight/vol. green) (g/cm³)
0.78
Air-dry Density (Weight and volume at 12%MC) (g/cm³)
0.89
Total shrinkage Tangential (Saturated to 0%MC) (%)
9.1
Total shrinkage Radial (Saturated to 0%MC) (%)
5.5
Recommended Dry Kiln Schedule
FR-10
Dimensional stability ratio (Total Tangential Shrinkage %/Total Radial Shrinkage %)
1.7
Wood Chemical Properties
Wood Mechanical Properties
Bending Strength (MOR),12%MC (kgf/cm²)
1407
Stiffness (MOE) 12%MC (kgf/cm²)
221961
Compression parallel to fiber 12%MC (kgf/cm²)
858
Compression perpendicular to fiber 12%MC (kgf/cm²)
128
Shear strength radial 12%MC (kgf/cm²)
102
Janka hardness (side) 12%MC (kgf)
994
Janka hardness (end grain) 12%MC (kgf)
1041
Workability
Sawing
Sawing of this species requires powerful equipment.
Rotary Veneer Cutting
Not suitable for veneering.
Sliced Veneer
Not suitable for veneering.
Blunting Effect
Moderate blunting effect; stellited blades for sawing and carbide tools for machining are advised.
Machining
It needs powerful tools for processing. Possible difficulties caused by interlocked grain are reported. It is recommended to use special tools for cutting.
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
Pre-boring is necessary.
Gluing
Difficult to glue because of high density.
Sanding
Difficult to obtain very good results because of interlocked grain.
Polishing
Can be polished without surface preparation.
Response To Hand Tools
Working with hand tools is difficult.
REFERENCED USES
End Uses Summary
EXTERIOR GENERAL, bridges, poles, paling, stakes posts, rails, crossarms, crossties, piers, HOUSING GENERAL, beams, joists, boards, flooring, parquet, frames, CONTAINERS, truck bodies, truck flooring
Exterior General
- 1 - Tabela de resultados de ensaios fisicos e mecanicos
Bridges
- 2 - 25 madeiras da amazonia de valor comercial, caracterizacao, macroscopica, usos comuns e indices qualificativos
Poles
- 3 - Estudo dendrologico e determinacao das caracteristicas fisicas e mecanicas do genipapo (Genipa americana)
Paling Fence Pickets
- 4 - Estudo dendrologico e determinacao das caracteristicas fisicas e mecanicas da bicuiba
Stake Posts
- 5 - Propriedades fisicas e mecanicas da madeira e do contraplacado de Pinus elliottii
Rails
- 6 - Physical and mechanical properties of Eucalyptus deglupta Blume grown in Costa Rica
Crossheads Crossarms
- 7 - Maderas latinoamericanas. II, Quercus alata Q. costaricensis y Q. eugeniaefolia
Crossties
- 8 - Maderas latinoamericas. III, Podocarpus standleyi ,Podocarpus oleifolius, Drims granadensis, Magnolia poasana y Didymopanax pittieri
Piers
- 9 - Maderas latinoamericanas. IV, Nectandra sp. Ocotea austinii, Persea sp. aff. vesticula, Persea schiedeana
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
Flooring
- 14 - Handbook of Hardwoods
Parquet
- 15 - Empire Timbers
Frames
- 16 - Woods of the World
Truck Body
- 53 - Timbers of the New World
Truck Flooring
- 54 - Bulletin of the Government Forest Experiment Station N.157: Identification of Tropical Woods
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