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OVENGKOL (Guibourtia ehie)

Trade Name

Ovengkol

Scientific Name

Guibourtia ehie J.Leon.

Family

LEGUMINOSAE

Common Names

Amazakoué (Côte d`Ivoire); Mozambique (United States of America); Amazoue (Côte d`Ivoire); Ehie (Ghana); Mozambque (United States of America); Palissandro (Equatorial Guinea); Ovengkol (Gabon); Anokye (Ghana); Hyeduanini (Ghana); Ovangkol

Scientific Name Synonyms

Copaifera ehie A. Chev.

Description Of The Tree

Botanical Description

The tree reaches a height of 40 m. The bole is occasionally fluted. The trunk diameter attains 120 cm.

Natural Habitat

Guibourtia ehie occurs in moderate densities in different forest types, from closed rain forest to drier semi-deciduous forest. It prefers swampy and periodically inundated forests. It is known or inferred that the harvesting of specimens from the wild fo

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Wood Identification

Anatomic Description Of Wood

Wood diffuse porous. Occasionally vessels exclusively solitary (over 90%). Tangential diameter of vessel lumina 100 to 150 micras (small). Vestured pits. Vessels per mm2 6 to 10 (medium). Simple perforation plates. Vessel-ray pits similar to intervessel pits in Axial parenchyma in marginal or in seemingly marginal bands. Paratracheal axial parenchyma scanty and/or vasicentric. Axial parenchyma lozenge-aliform. Axial parenchyma aliform. Prismatic crystals in chambered axial parenchyma cells and/or in fibers. 5 to 8 ce 4 to 10 rays per mm (medium). Rays non-storied. Larger rays more than 4 seriate. Homogeneous rays and/or sub-homogeneous rays (all ray cells procumbent). Non-septate fibers. Fibers with simple to minutely bordered pits.

  • Wood Macro Photo Tangential Plane
  • Wood Micro Photo Of Transversal Section

Availability

Cites Status

Unrestricted

General Wood Description

Color

The sapwood is greyish white, it has a thickness of 4 to 7 cm. The heartwood is yellow brown to dark brown, it is clearly demarcated. The silver figure is slightly lustrous.

COLOR INDEX (1=Black, 7=Light yellow,white)

4

Grain

It has highly interlocked grain.

Texture

The texture is typically fine to medium.

Luster

This species is moderate in luster.

Natural Durability

Durable to decay; this species can be utilized without preservative treatment for exterior joinery or similar uses. 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.

Silica Content

Silica Content: Negligible content of silica is reported. Amounts over 0.05% may affect wood processing. Silica Value: 0

Resistance To Impregnation

Difficult to treat with only a low penetration of the preservative products.

Wood Physical Properties

Basic Density or Specific Gravity (O.D. weight/vol. green) (g/cm³)

0.73

Air-dry Density (Weight and volume at 12%MC) (g/cm³)

0.82

Total shrinkage Tangential (Saturated to 0%MC) (%)

8.0

Total shrinkage Radial (Saturated to 0%MC) (%)

3.9

Recommended Dry Kiln Schedule

FR-9

Dimensional stability ratio (Total Tangential Shrinkage %/Total Radial Shrinkage %)

2.0

Wood Chemical Properties

Wood Mechanical Properties

Bending Strength (MOR),12%MC (kgf/cm²)

1296

Stiffness (MOE) 12%MC (kgf/cm²)

218862

Compression parallel to fiber 12%MC (kgf/cm²)

705

Compression perpendicular to fiber 12%MC (kgf/cm²)

98

Shear strength radial 12%MC (kgf/cm²)

115

Janka hardness (side) 12%MC (kgf)

845

Janka hardness (end grain) 12%MC (kgf)

914

Workability

Sawing

Sawing of this species requires powerful equipment.

Rotary Veneer Cutting

Suitable for slicing.

Sliced Veneer

Suitable for slicing.

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

Rather difficult; special tools are needed.

Turning

30

Boring

Rather difficult; special tools are needed.

Mortising

Rather difficult; special tools are needed.

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

HOUSING GENERAL, boards, flooring, parquet, frames, steps, panelling, fittings, FURNITURE AND CABINETS, luxury furniture, cabinets, PLYWOOD AND VENEER, Decorative veneer, TURNING, ornaments, turned furniture, cutlery, lasts, OTHER AND MUSICAL INSTRUMENTS, handicrafts

General Housing
  • 10 - Silica in Timbers
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
Steps
  • 17 - Tree Conservation Database
Paneling
  • 18 - W3TROPICOS Missouri Botanical Garden
Fittings
  • 19 - Silica in Timbers
Furniture Cabinets
  • 21 - Tropical timbers of the world. Part III-Southeast Asian and Oceanian Species.
Furniture, Luxury
  • 22 - Dry kiln schedules for commercial woods. Temperate and tropical. Section IV-Asian and Oceanian Woods
Cabinet
  • 24 - Empire Timbers
Panels, Veneers
  • 25 - Directory of Timber Trade Malaysia
Decorative veneer
  • 28 - Ministry of Agriculture, Fisheries & Forest of Fiji
Turning
  • 30 - Embassy of Honduras in Japan
Ornaments
  • 31 - Embassy of Colombia in Japan
Turned Articles
  • 32 - Embassy of Cote d`Ivoire in Japan
Knife Handles
  • 33 - Embassy of Gabon in Japan
Lasts
  • 34 - Embassy of Indonesia in Japan
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.)

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