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OvangkolOvangkolOvangkolOvangkolOvangkol
Ovangkol (Guibourtia ehie)

Family: Leguminosae

Common names: Amazakoue, Amazoue, Anokye, Bubinga, Ehie, Gabon ovanko, Ghana anokye, Hyedua, Hyedua-nini, Hyeduanini, Ivory Coast amazakoue, Mongoy, Mongoy walnut, Ovangkol, Ovengkol, Pallisandro

Distributed in: Cameroon, Equatorial Guinea, Gabon, Ghana, Ivory Coast, Nigeria (Africa)

Distribution overview: Cameroon, C￿d'Ivoire, Gabon, Ghana, Liberia and southern Nigeria. Prefers closed rain forests and transitional forests, often in small groups. In Ghana, it is successful in the dryer areas of moist semi-deciduous forest.

Common uses: Bridge construction, Cabinetmaking, Chemical derivatives, Decorative veneer, Domestic flooring, Door, Fine furniture, Flooring, Furniture , Furniture, Joinery, Musical instruments, Paneling , Paneling, Plywood, Tables, Tool handles, Turnery, Veneer, Veneer: decorative

Product sources: Apart from timber, many species in the genus Guibourtia are reported to produce the gum known as Copal.

Environment profile: Rare

Tree size: Trunk diameter is 100-150 cm

Colors: the heart isYellow to golden-yellow to orange, Yellowish brownand the sapwoodWhite to yellow, Yellow.The grain isStriped figure, the textureMedium coarse to coarseand the lusterMedium

Natural durability: Susceptible to insect attack, Very durable

Odor: Unpleasent odor associated with freshly milled wood

Silica Content: Siliceous

Kiln Schedules: Drying (speed) is fast

Kiln Drying Rate: Naturally dries quickly

Drying Defects: Checking, Distortion

Ease of Drying: Reconditioning Treatement

Tree Identification: Bole/stem form is straight

Comments: General finishing qualities are rated as good Reaction with Metals - The timber may stain under moist conditions if it is brought into contact with iron and iron containing metals.

Blunting Effect: Moderate

Boring: Moderately easy

Carving: Fairly Difficult to Very Difficult

Cutting Resistance: Saws slowly but well

Gluing: Good gluing properties

Mortising: Finishes well

Moulding: Good finishing

Movement in Service: Good finishing

Nailing: Poor to Very Poor , Pre-Boring Recommended

Planing: Yields clean surfaces

Resistance to Impregnation: Sapwood is moderately resistant

Response to hand tools: Responds fairly well to hand tools

Routing recessing: Fairly Difficult to Very Difficult

Sanding: Good sanding finish

Veneering qualities: Veneers easily, Veneers moderately easy

Steam bending: Unsuitable

Screwing: Pre-boring recommended, Screwing yields good results; Turning: Poor to Very Poor Results

Painting: Very Good to Excellent; Polishing: Very Good to Excellent; Staining: Surface Preparation; Varnishing: Good;

  • Numerical data Metric
  • Numerical data English
  • Strength properties
  • References
Item Green Dry Metric
Specific Gravity 0,62 0,72
Density 801 kg/m3
Bending Strength 943 1325 kg/cm2
Crushing Strength 485 648 kg/cm2
Hardness 601 kg
Impact Strength cm
Shearing Strength 211 kg/cm2
Stiffness 143 174 1000 kg/cm2
Tangential Shrinkage 8 %
Radial Shrinkage 4 %
Weight 737 592 kg/m3
Maximum Load cm-kg/cm3
Toughness cm-kg
Static Bending kg/cm2
Item Green Dry English
Bending Strength 13426 18857 psi
Density 50 lbs/ft3
Hardness 1326 lbs
Maximum Crushing Strength 6899 9224 psi
Shearing Strength 3015 psi
Stiffness 2041 2479 1000 psi
Specific Gravity 0.62 0.72
Weight 46 37 lbs/ft3
Radial Shrinkage 4 %
Tangential Shrinkage 8 %
Volumetric Shrinkage 11 %

Bending strength (MOR) = high
Max. crushing strength = high
Modulus of Elasticity (stiffness) = high
Density (dry weight) = 53-60 lbs/cu. ft
Density (dry weight) = 46-52 lbs/cu. ft.
Shrinkage, Tangential = fairly large
Shrinkage, Radial = moderate
Bending strength (MOR) = medium
Shrinkage, Tangential = moderate
Shrinkage, Tangential = large
Shrinkage, Radial = small
Shrinkage, Radial = fairly large
Shearing strength (parallel to the grain) = very high
Shearing strength (parallel to grain) = high
Modulus of Elasticity (stiffness) = medium
Hardness (side grain) = soft
Hardness (side grain) = medium
Density (dry weight) = 38-45 lbs/cu. ft.
Density (dry weight) = 31-37 lbs/cu. ft.
Bending strength (MOR) = very high
The species has very high bending strength, and is much stronger than Teak in the air-dry condition (about 12 percent moisture content). Strength in compression parallel to grain is in the high range. Other species in this range include Teak, White oak, and Hard maple. The density of the wood is very high

Ashiabor, W.K.,1968,The Properties of Afzelia africana, Anogeissus leiocarpus, Cynometra,anata, Guibourtia ehie, Tectona grandis,Forest Products Research Laboratory, Ghana Tech. Note,No.6Chudnoff, M.,1984,Tropical Timbers of the World,U.S.A. Department of Agriculture, Forest Service, Forest Products,Laboratory, Madison.Erfurth, T., Rusche, H.,1976,The Marketing of Tropical Wood A. Wood Species from African Moist Forests,F.A.O. Forestry DepartmentFrance - C.T.F.T.,1977,Promotion of African Timbers - New Species,CTFT,35 LeafletsHMSO. 1981. Handbook of Hardwoods, 2nd Edition. Revised by R.H. Farmer. Department of the Environment, Building Research Establishment, Princes Risborough Laboratory, Princes Risborough, Aylesbury, Buckinghamshire.Keay, R.W.J.1989. Trees of Nigeria.Revised Version of Nigerian Trees. Clarendon Press, Oxford.Kukachka, B.F.,1970,Properties of Imported Tropical Woods,Forest Research Paper FPL 125Lincoln, W.A. 1986. World Woods in Color. Linden Publishing Co. Inc. Fresno, California.Rio Rivuma. 1995. Guibourtia ehie - Potential Commercial Species from the Zaire Basin System. Rio Rivuma, 229 A Street, Boston, MA.USDA. 1987. Wood Handbook - Wood as an Engineering Material. United States Department of Agriculture (USDA, Forest Service, Agriculture Handbook No. 72, Forest Products Laboratory, Madison, Wisconsin.WCMC. 1992. Conservation Status Listing: Trees and Timbers of the World. World Conservation Monitoring Center (WCMC, Plants Program, 219 Huntingdon Road, Cambridge, CB3 ODL, United Kingdom.
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