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GAOUO (Corynanthe pachyceras)
Trade Name
Gaouo
Scientific Name
Corynanthe pachyceras K.Schum.
Family
RUBIACEAE
Common Names
Gaouo (Côte d`Ivoire); Akel (Gabon); Djombe oua (Cameroon); Akalan (Cameroon)
Scientific Name Synonyms
Pseudocinchona pachyceras (K. Schum.) A. Chev.; Pausinystalia pachyceras (K. Schum.) De Wild.
Description Of The Tree
Botanical Description
The tree reaches a height of 20 to 46 m, with trunk diameters from 70 to 100 cm. The bole is rarely straight, often twisted and branched, but in large specimen it can be 30 m long. Small buttresses are present at the base of the tree.
Natural Habitat
Corynanthe pachyceras is found in the understorey of evergreen forest, often in groups, or as a co-dominant in primary forests.
Wood Identification
Anatomic Description Of Wood
Wood diffuse porous. Vessels exclusively solitary (over 90%). Tangential diameter of vessel lumina 100 micras or less (very small). Vestured pits. Vessels per mm2 more than 20 (very abundant). Simple perforation plates. Vessel-ray pits similar to intervessel pi Apotracheal axial parenchyma diffuse and/or diffuse in aggregates. 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 4 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 pale pink with yellow tinge, turning yellow brown with age, it is not demarcated. The silver figure is ribbon-like.
Grain
Straight or slightly interlocked, sometimes with an influence on further processing operations.
Texture
This species is usually reported to have a fine texture.
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. Resistant to termites attack.
Natural durability index (1= Very high durability, 7=Vey low durability)
6
Wood Physical Properties
Basic Density or Specific Gravity (O.D. weight/vol. green) (g/cm³)
0.70
Air-dry Density (Weight and volume at 12%MC) (g/cm³)
0.79
Total shrinkage Tangential (Saturated to 0%MC) (%)
8.8
Total shrinkage Radial (Saturated to 0%MC) (%)
4.1
Dimensional stability ratio (Total Tangential Shrinkage %/Total Radial Shrinkage %)
2.1
Wood Chemical Properties
Wood Mechanical Properties
Bending Strength (MOR),12%MC (kgf/cm²)
1167
Stiffness (MOE) 12%MC (kgf/cm²)
198406
Compression parallel to fiber 12%MC (kgf/cm²)
691
Compression perpendicular to fiber 12%MC (kgf/cm²)
96
Shear strength radial 12%MC (kgf/cm²)
95
Janka hardness (side) 12%MC (kgf)
779
Janka hardness (end grain) 12%MC (kgf)
857
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.
Planing
Moderately easy; tools must be cautiously sharpened.
Moulding
Easy; no particular problems.
Turning
30
Boring
Easy; no particular problems.
Mortising
Easy; no particular problems.
Nailing
Pre-boring is necessary.
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
Working with hand tools is difficult.
REFERENCED USES
End Uses Summary
EXTERIOR GENERAL, poles, stakes posts, crossties, HOUSING GENERAL, parquet, fittings, FURNITURE AND CABINETS, cabinets, PLYWOOD AND VENEER, TURNING, SPORTS, TOOLS, tool handles, agricultural tools, PACKING, CONTAINERS, cooperage, NAVAL CONSTRUCTION, boats, OTHER AND MUSICAL INSTRUMENTS, handicrafts, scale model
Exterior General
- 1 - Tabela de resultados de ensaios fisicos e mecanicos
Poles
- 3 - Estudo dendrologico e determinacao das caracteristicas fisicas e mecanicas do genipapo (Genipa americana)
Stake Posts
- 5 - Propriedades fisicas e mecanicas da madeira e do contraplacado de Pinus elliottii
Crossties
- 8 - Maderas latinoamericas. III, Podocarpus standleyi ,Podocarpus oleifolius, Drims granadensis, Magnolia poasana y Didymopanax pittieri
General Housing
- 10 - Silica in Timbers
Parquet
- 15 - Empire Timbers
Fittings
- 19 - Silica in Timbers
Furniture Cabinets
- 21 - Tropical timbers of the world. Part III-Southeast Asian and Oceanian Species.
Cabinet
- 24 - Empire Timbers
Panels, Veneers
- 25 - Directory of Timber Trade Malaysia
Turning
- 30 - Embassy of Honduras in Japan
Sports
- 38 - Annual Review and Assessment of the World Timber Situation 1998-ITTO
Tools
- 42 - Utilización Industrial de Nuevas Especies Forestales en el Perú.
Tool Handles
- 43 - Maderas de Bolivia (Características y Usos de 55 Maderas Tropicales)
Agricultural Tools
- 44 - Atlas of Peruvian Woods
Packing
- 45 - Recopilación y Análisis de Estudios Tecnológicos de Maderas Peruanas
Containers
- 50 - Properties of imported tropical woods
Cooperage
- 51 - Recopilacion de propiedades mecanicas de maderas creciendo en Chile
Shipbuilding
- 55 - Tropical Timber Atlas of Latin America
Boats
- 56 - Manual de Identificación de Especies Forestales de la Subregión Andina.
Other & Musical Instruments
- 63 - Madeiras do Brazil II
Handcraft
- 66 - Maderas latinoamericanas. VII. Caracteristicas anatomicas. propiedades fisicomecanicas, de secado, y tratabilidad de la madera juvenil de Cordia alliodora (Ruiz & Pav. Oken.)
Scale Models
- 83 - Algunas caracteristicas fisicomecanicas de la madera de tres especies de la cordillera NeoVolcanica
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