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OSSOKO (Scyphocephalium mannii)
Trade Name
Ossoko
Scientific Name
Scyphocephalium mannii Warb.
Family
MYRISTICACEAE
Common Names
Sorro (Gabon); Ossoko (Gabon); N'suku (Gabon); Ossoko
Scientific Name Synonyms
Scyphocephalium ochocoa Warb.; Myristica mannii Benth. & Hook.
Description Of The Tree
Botanical Description
The tree reaches a height of 40 m. The bole is straight, fluted, may be up to 23 m in length. The trunk diameter attains 100 cm.
Natural Habitat
Scyphocephalium mannii occurs in lowland rain forests often on swampy ground, also on abandoned farmland.
Natural Distribution
Gabon and Cameroon
Non Timber Uses
Contains some resins or extracts which could pose problems when machining or finishing.
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). Non-vestured pits. Vessels per mm2 less than 6 (rare). Simple perforation plates. Scalariform perforation plates with 5 t Axial parenchyma in marginal or in seemingly marginal bands. Paratracheal axial parenchyma scanty and/or vasicentric. Non-crystals in axial parenchyma cells. 5 to 8 cells per parenchyma strand. Rays more than 10 per mm (abundant). Rays non-storied. Rays 1 to 2 seriate. Rays exclusively uniseriate. Silica bodies in the ray cells. Heterogeneous rays and/or multiseriate heterogeneous rays. Occasionally septate fibers present. Fibers with simple to minutely bordered pits.
Availability
Cites Status
Unrestricted
General Wood Description
Color
The sapwood is yellowish white. The heartwood is orange brown, it is clearly demarcated.
COLOR INDEX (1=Black, 7=Light yellow,white)
4
Grain
Straight or slightly interlocked, sometimes with an influence on further processing operations.
Texture
The wood is typically medium in texture.
Luster
Luster is usually high.
Natural Durability
Slightly durable to decay. This species needs preservative treatment for uses with risks of occasional re-humidification. It is not suited for uses with risks of permanent or long-lasting humidification. The heartwood is sensible to termites and Lyctus at
Natural durability index (1= Very high durability, 7=Vey low durability)
6
Internal Growth Stresses
No growth stresses are reported in this species.
Silica Content
Silica Content: It is reported to have silica. Contents over 0.05% may affect wood processing. Silica Value: 0.13
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)
0.54
Air-dry Density (Weight and volume at 12%MC) (g/cm³)
0.59
Total shrinkage Tangential (Saturated to 0%MC) (%)
6.1
Total shrinkage Radial (Saturated to 0%MC) (%)
3.5
Drying Defects
Ease of Drying: Drying is moderately difficult to difficult; special care is systematically needed. Drying Defects: No particular risks of drying defects, subject to normal drying conditions. 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-7
Dimensional stability ratio (Total Tangential Shrinkage %/Total Radial Shrinkage %)
1.8
Wood Chemical Properties
Wood Mechanical Properties
Bending Strength (MOR),12%MC (kgf/cm²)
794
Stiffness (MOE) 12%MC (kgf/cm²)
135161
Compression parallel to fiber 12%MC (kgf/cm²)
467
Compression perpendicular to fiber 12%MC (kgf/cm²)
57
Shear strength radial 12%MC (kgf/cm²)
60
Janka hardness (side) 12%MC (kgf)
432
Janka hardness (end grain) 12%MC (kgf)
537
Workability
Sawing
It is easy to saw.
Rotary Veneer Cutting
Not suitable for veneering.
Sliced Veneer
Not suitable for veneering.
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
Moderately easy; tools must be cautiously sharpened.
Turning
30
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.
Response To Hand Tools
No particular problems.
REFERENCED USES
End Uses Summary
HOUSING GENERAL, joists, boards, frames, panelling, fittings, shutter boards, FURNITURE AND CABINETS, common furniture, TURNING, ornaments, turned furniture, PACKING, light packing, pallets, OTHER AND MUSICAL INSTRUMENTS, handicrafts, door core, coffin, moldings
General Housing
- 10 - Silica in Timbers
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
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
Turning
- 30 - Embassy of Honduras in Japan
Ornaments
- 31 - Embassy of Colombia in Japan
Turned Articles
- 32 - Embassy of Cote d`Ivoire in Japan
Packing
- 45 - Recopilación y Análisis de Estudios Tecnológicos de Maderas Peruanas
Light Packing
- 46 - ECUADOR, Inventario y Aprovechamiento de los Bosques del Sur Ecuatoriano
Pallets
- 48 - The strength properties of timbers
Handcraft
- 66 - Maderas latinoamericanas. VII. Caracteristicas anatomicas. propiedades fisicomecanicas, de secado, y tratabilidad de la madera juvenil de Cordia alliodora (Ruiz & Pav. Oken.)
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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