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NGANG (Hymenostegia pellegrini)
Trade Name
Ngang
Scientific Name
Hymenostegia pellegrini J.Leon.
Family
LEGUMINOSAE
Common Names
N'gang (Gabon); Gebanda blanc (Gabon); Gebanda (Gabon); Kifula kimassesse (Congo); Ngang
Scientific Name Synonyms
Dipetalanthus pellegrini A. Chev.; Cynometra bipetala Pellegr.
Description Of The Tree
Botanical Description
The tree reaches a height of 23 to 32 m. The bole is neither cylindrical nor very straight, somewhat fluted or with small, numerous, low and thin buttresses. The trunk diameter attains 100 cm.
Natural Habitat
Hymenostegia pellegrini prefers humid, dense lowland forests. Often found in small groups.
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). Vestured pits. Vessels per mm2 10 to 20 (abundant). Simple perforation plates. Vessel-ray pits similar to intervessel pit Occasionally axial parenchyma in marginal or in seemingly marginal bands. Axial parenchyma confluent. Axial parenchyma in continuous tangential lines (included in reticulate and scalariform). Prismatic crystals in short chains in chambered axial parenchyma c Rays more than 10 per mm (abundant). Rays non-storied. Rays commonly 2 seriate. Homogeneous rays and/or sub-homogeneous rays (all ray cells procumbent). Body ray cells procumbent with one row of upright and/or square marginal cells (Kribs-III). Non-septate fibers. Fibers with simple to minutely bordered pits.
Availability
Cites Status
Unrestricted
General Wood Description
Color
The sapwood is yellow white. The heartwood is pink-brown, it is not clearly demarcated.
Grain
Straight or slightly interlocked, sometimes with an influence on further processing operations.
Texture
The wood is mostly fine 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. Resistant to termites attack.
Natural durability index (1= Very high durability, 7=Vey low durability)
3
Wood Physical Properties
Basic Density or Specific Gravity (O.D. weight/vol. green) (g/cm³)
0.86
Air-dry Density (Weight and volume at 12%MC) (g/cm³)
0.99
Total shrinkage Tangential (Saturated to 0%MC) (%)
10.2
Total shrinkage Radial (Saturated to 0%MC) (%)
5.7
Dimensional stability ratio (Total Tangential Shrinkage %/Total Radial Shrinkage %)
1.8
Wood Chemical Properties
Wood Mechanical Properties
Bending Strength (MOR),12%MC (kgf/cm²)
1993
Stiffness (MOE) 12%MC (kgf/cm²)
240555
Compression parallel to fiber 12%MC (kgf/cm²)
1017
Compression perpendicular to fiber 12%MC (kgf/cm²)
160
Shear strength radial 12%MC (kgf/cm²)
129
Janka hardness (side) 12%MC (kgf)
1236
Janka hardness (end grain) 12%MC (kgf)
1237
Workability
Sawing
Sawing of this species requires powerful equipment.
Rotary Veneer Cutting
Not suitable for veneering.
Sliced Veneer
Not suitable for veneering.
Blunting Effect
Severe blunting effect; stellited blades for sawing and carbide tools for machining are recommended.
Machining
It needs powerful tools for processing. Possible difficulties caused by interlocked grain are reported.
Planing
Rather difficult; special tools are needed.
Moulding
Easy; no particular problems.
Turning
30
Boring
Easy; no particular problems.
Mortising
Easy; no particular problems.
Nailing
Pre-boring is necessary.
Gluing
Difficult to glue because of high density.
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, PLYWOOD AND VENEER, TURNING, SPORTS, TOOLS, tool handles, agricultural tools, CONTAINERS, truck bodies, truck flooring, NAVAL CONSTRUCTION, boats, OTHER AND MUSICAL INSTRUMENTS, handicrafts
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
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
Truck Body
- 53 - Timbers of the New World
Truck Flooring
- 54 - Bulletin of the Government Forest Experiment Station N.157: Identification of Tropical Woods
Shipbuilding
- 55 - Tropical Timber Atlas of Latin America
Boats
- 56 - Manual de Identificación de Especies Forestales de la Subregión Andina.
Handcraft
- 66 - Maderas latinoamericanas. VII. Caracteristicas anatomicas. propiedades fisicomecanicas, de secado, y tratabilidad de la madera juvenil de Cordia alliodora (Ruiz & Pav. Oken.)
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