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EYONG (Eribroma oblonga)
Trade Name
Eyong
Scientific Name
Eribroma oblonga Bodart
Family
STERCULIACEAE
Common Names
njong (Guinea-Bissau); Bi (Côte d`Ivoire); N'zong (Gabon); N'chong (Gabon); N'zong (Equatorial Guinea); N'chong (Equatorial Guinea); Yellow sterculia (United Kingdom); White sterculia (United Kingdom); Bongo (Central African Republic); N`zong (Equatorial Guinea); N`chong (Gabon); Bongele (Cameroon); Eyong (Cameroon); Okoko (Nigeria)
Scientific Name Synonyms
Sterculia oblonga Mast.; Sterculia elegantiflora; Eribroma klaineana Pierre
Description Of The Tree
Botanical Description
The tree reaches a height of 26 to 32 m. The bole is straight, and up to 15 m in length. The trunk diameter is 100 to 130 cm.
Natural Habitat
Eribroma oblonga is a species of various rain forest types. It occurs in rain primary and secondary forests.
Wood Identification
Anatomic Description Of Wood
Wood diffuse porous. Occasionally vessels exclusively solitary (over 90%). Tangential diameter of vessel lumina 200 micras or more (large). Tyloses thin walled. Non-vestured pits. Vessels per mm2 less than 6 (rare). Simple perforation plates. Vessel-ray pits sim Axial parenchyma in thick bands. Axial parenchyma storied. Prismatic crystals in chambered axial parenchyma cells and/or in fibers. 3 to 4 cells per parenchyma strand. Axial parenchyma bands under 4 per mm. Rays less than 4 per mm (rare). Rays as wide or wider than the pores. Rays non-storied. Larger rays more than 4 seriate. Sheath cells. Occasionally prismatic crystals in the ray cells. Non-septate fibers. Fibers with simple to minutely bordered pits.
Availability
Cites Status
Unrestricted
General Wood Description
Color
The heartwood is creamy white to pale yellowish-brown, it is not clearly demarcated. The silver figure is large.
COLOR INDEX (1=Black, 7=Light yellow,white)
6
Grain
Straight or slightly interlocked, sometimes with an influence on further processing operations.
Texture
The wood is typically medium in texture.
Luster
The surface of the wood is naturally high in luster.
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
For this species no growth stresses are reported.
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)
0.66
Air-dry Density (Weight and volume at 12%MC) (g/cm³)
0.74
Total shrinkage Tangential (Saturated to 0%MC) (%)
10.6
Total shrinkage Radial (Saturated to 0%MC) (%)
4.6
Drying Defects
Ease of Drying: Drying is moderately easy; some particular care is needed. Drying Defects: No particular risks of drying defects, subject to normal drying conditions. Kiln Schedules: The kiln schedule has been tested.
Recommended Dry Kiln Schedule
FR-8
Dimensional stability ratio (Total Tangential Shrinkage %/Total Radial Shrinkage %)
2.3
Wood Chemical Properties
Wood Mechanical Properties
Bending Strength (MOR),12%MC (kgf/cm²)
1024
Stiffness (MOE) 12%MC (kgf/cm²)
174430
Compression parallel to fiber 12%MC (kgf/cm²)
566
Compression perpendicular to fiber 12%MC (kgf/cm²)
73
Shear strength radial 12%MC (kgf/cm²)
45
Janka hardness (side) 12%MC (kgf)
681
Janka hardness (end grain) 12%MC (kgf)
771
Workability
Sawing
It is moderately 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
Moderate blunting effect; stellited blades for sawing and carbide tools for machining are advised.
Machining
Possible difficulties caused by interlocked grain are reported.
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
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.
Steam Bending
This species can be used for steam bending.
Response To Hand Tools
No particular problems.
REFERENCED USES
End Uses Summary
HOUSING GENERAL, boards, flooring, parquet, frames, steps, panelling, fittings, shutter boards, FURNITURE AND CABINETS, common furniture, PLYWOOD AND VENEER, faces, decorative
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
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
Panels, Veneers
- 25 - Directory of Timber Trade Malaysia
Faces
- 26 - Annual Review and Assessment of the World Timber Situation 1998-ITTO
Decorative veneer
- 28 - Ministry of Agriculture, Fisheries & Forest of Fiji
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