Angok (Didelotia africana)
Family: Leguminosae
Common names: Angok, Bondu, Broutou, Bubinga, Ekop gombGombTimba
Distributed in: Cameroon, Central African Republic, Congo, Gabon, Liberia, Nigeria, Sierra Leone, Zaire (Africa)
Distribution overview: Grows in the wet forests of West Africa, from Liberia and Sierra Leone in the west to Congo and Central African Republic in the east.
Common uses: Bedroom suites, Blockboard, Building construction, Building materials, Cabin construction, Cabinetmaking, Chairs, Chests, Concealed parts (Furniture), Construction, Core Stock, Cutting surfaces, Decorative veneer, Desks, Dining-room furniture, Domestic flooring, Dowell pins, Dowells, Drawer sides, Drum sticks, Excelsior, Factory construction, Factory flooring, Figured veneer, Fine furniture, Floor lamps, Flooring, Furniture , Furniture components, Furniture squares or stock, Hatracks, Heavy construction, Joinery, Kitchen cabinets, Living-room suites, Mine timbers, Musical instruments , Office furniture, Organ pipes, Parquet flooring, Turnery, Veneer
Product sources: Some material, mainly in the form of logs is exported from the producing countries, especially Cameroon and Ivory Coast, but quantities can be increased substantially if demand increases.
Environment profile: Secure within its range
Extinct, Endangered, Vulnerable, or Rare in Cameroon. Its status in the wild is currently listed as unknown in Nigeria because of insufficient information (Source - World Conservation Monitoring Center - 1992 )
Tree size: Trunk diameter is 100-150 cm
Colors: the heart isRed, Whiteand the sapwoodWhite, White to yellow.The grain isStraight, the textureMedium to coarse
Natural durability: Susceptible to pinhole borer attack , Susceptible to termite attack
Odor: May have a slightly disagreeable smell when green
Silica Content: No affect on machining
Kiln Drying Rate: Naturally dries slowly
Drying Defects: Distortion, Splitting
Ease of Drying: Slowly
Blunting Effect: Blunting effect on sawing dry wood is mild
Boring: Fairly easy to very easy
Cutting Resistance: Easy to saw
Gluing: Fairly Easy to Very Easy
Mortising: Fairly Easy to Very Easy
Moulding: Very Good to Excellent
Movement in Service: Very Good to Excellent
Nailing: Pre-Boring Recommended, Satisfactory nailing properties
Planing: Very Good to Excellent
Resistance to Impregnation: Resistant sapwood
Response to hand tools: Easy to Work
Routing recessing: Fairly Easy to Very Easy
Sanding: Very Good to Excellent Results
Veneering qualities:
Logs are reported to peel without difficulty after steaming at about 175 degrees F (80 degrees C). They also slice rather easily to yield decorative veneers. Drying is rather difficult since veneers are liable to split. They respond readily to gluing either with UF or PF type glues. Mechanical strength of plywood is satisfactory
Screwing: Good screw holding properties
;
Painting: Very Good to Excellent; Polishing: Very Good to Excellent; Varnishing: Very Good to Excellent;
- Numerical data Metric
- Numerical data English
- Strength properties
- References
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Item |
Green |
Dry |
Metric |
Specific Gravity |
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|
|
Density |
|
624 |
kg/m3 |
Bending Strength |
|
925 |
kg/cm2 |
Crushing Strength |
|
500 |
kg/cm2 |
Hardness |
|
|
kg |
Impact Strength |
|
|
cm |
Shearing Strength |
|
|
kg/cm2 |
Stiffness |
|
119 |
1000 kg/cm2 |
Tangential Shrinkage |
8 |
|
% |
Radial Shrinkage |
5 |
|
% |
Weight |
881 |
721 |
kg/m3 |
Maximum Load |
|
|
cm-kg/cm3 |
Toughness |
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cm-kg |
Static Bending |
|
|
kg/cm2 |
|
 |  |  |  | Item | Green | Dry | English | Bending Strength | | 13164 | psi | Density | | 39 | lbs/ft3 | Maximum Crushing Strength | | 7113 | psi | Stiffness | | 1697 | 1000 psi | Weight | 55 | 45. | lbs/ft3 | Radial Shrinkage | 5 | | % | Tangential Shrinkage | 8 | | % | Volumetric Shrinkage | 13 | | % | |
Bolza, E., Keating, W.G.,1972,African Timbers - the Properties, Uses and Characteristics of 700 Species,C.S.I.R.O. Div. of Building ResearchITTO. New Marketable Species Technical Notes. Prepared by Centre Technique Forestier Tropical (CTFT, Division of CIRAD, 45 bis, Avenue de la Belle Gabrielle, 94736 Nogent-sur-marne Cedex, France.Maeglin, R., C. K. Baah, G. Troemmer, J.D. Danielson, and S. P. Loehnertz.1989.Pre-project Report:Sawing of Difficult Species.Prepared for International Tropical Timber Organization (ITTO) by United States Department of Agriculture (USDA, Forest Service, Forest Products Laboratory, Madison, Wisconsin.
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