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ONZABILI (Antrocaryon micraster)

Trade Name

Onzabili

Scientific Name

Antrocaryon micraster A.Chev. et Guillaum.

Family

ANACARDIACEAE

Common Names

Bitri (Guinea); Akoua (Côte d`Ivoire); Anguekong (Equatorial Guinea); N'gongo (Congo); N'gongo (Angola); Tshitoke; Tshinsono; Tshimumbu; Tshimanya; Tshikosokoso; Ngongo; Mumbu; Kuminimba; Ha-okete; Bougongi; Antrocaryon; Akoua; Mongongo (Portugal); Aprokuma (Ghana); N`gongo (Angola); Mugongo (Zaire); Onzabili (Gabon); Angufkong (Equatorial Guinea); Angonga (Cameroon)

Scientific Name Synonyms

Antrocaryon polyneurum Mildbr.

Description Of The Tree

Botanical Description

The bole is up to 32 m in length, with trunk diameters usually up to 130 cm. The tree is unbuttressed.

Natural Habitat

Antrocaryon micraster occurs scattered throughout semi-deciduous forests and sporadically in evergreen forests in tropical Africa.

Natural Distribution

West and Central Africa, from Sierra Leone to the Democratic Republic of the Congo.

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). Tyloses thin walled. Non-vestured pits. Vessels per mm2 6 to 10 (medium). Simple perforation plates. Vessel-ray pits simil Paratracheal axial parenchyma scanty and/or vasicentric. 4 to 10 rays per mm (medium). Rays non-storied. Rays 1 to 4 seriate. Body ray cells procumbent with mostly 2 to 4 rows of upright and/or square marginal cells (Kribs-II). Septate fibers present. Fibers with simple to minutely bordered pits.

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

Availability

Cites Status

Unrestricted

General Wood Description

Color

The sapwood is greyish white. The heartwood is pinkish white to red brown, it is hardly demarcated from heartwood. The silver figure is fine.

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

5

Grain

Straight or slightly interlocked, sometimes with an influence on further processing operations.

Texture

Medium texture is reported in this species.

Luster

The wood is described as low in luster.

Natural Durability

Not durable; important risks of decay attacks at any processing step, from logs up to final products. It must receive preservative treatment. Sensible to termites attack. Heartwood is sensible to Lyctus attacks.

Natural durability index (1= Very high durability, 7=Vey low durability)

5

Internal Growth Stresses

No residual growth stresses are found.

Resistance To Impregnation

Moderately easy to treat with a partial penetration of the preservative products.

Wood Physical Properties

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

0.48

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

0.52

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

7.4

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

4.7

Drying Defects

Ease of Drying: Drying is moderately easy; some particular care is needed. Drying Defects: Risks of discoloration caused by decay Kiln Schedules: The kiln schedule has been tested.

Recommended Dry Kiln Schedule

FR-8

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

1.6

Wood Chemical Properties

Wood Mechanical Properties

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

896

Stiffness (MOE) 12%MC (kgf/cm²)

136400

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

493

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

61

Shear strength radial 12%MC (kgf/cm²)

84

Janka hardness (side) 12%MC (kgf)

331

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

434

Workability

Sawing

It is easy to saw.

Rotary Veneer Cutting

Suitable for slicing, also suitable for peeling if treated.

Sliced Veneer

Suitable for slicing, also suitable for peeling if treated.

Blunting Effect

Slight blunting effect; ordinary tools can be used for sawing and machining.

Machining

Machining of this species is reportedly easy.

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

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.

Steam Bending

This species can be used for steam bending.

Response To Hand Tools

No particular problems.

REFERENCED USES

End Uses Summary

HOUSING GENERAL, beams, joists, boards, frames, steps, panelling, fittings, FURNITURE AND CABINETS, common furniture, PLYWOOD AND VENEER, faces, cores, common veneer, PACKING, heavy packing, pallets, OTHER AND MUSICAL INSTRUMENTS, door core, coffin, moldings

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
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, Common
  • 23 - Handbook of Hardwoods
Panels, Veneers
  • 25 - Directory of Timber Trade Malaysia
Faces
  • 26 - Annual Review and Assessment of the World Timber Situation 1998-ITTO
Cores
  • 27 - Embassy of Brazil in Japan
Common Veneer
  • 29 - Embassy of Ecuador in Japan
Packing
  • 45 - Recopilación y Análisis de Estudios Tecnológicos de Maderas Peruanas
Heavy Packing
  • 47 - Arvores Brasileiras
Pallets
  • 48 - The strength properties of timbers
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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