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Bomanga
Bomanga (Brachystegia zenkeri)

Family: Leguminosae

Common names: Akolodo, Ariella, Bomanga, Ekop evene, Ekop leke, Manga, Meblo, Mendou, Naga, Ngu, Nzang, Okwen, Yegna

Distributed in: Benin, Cameroon, Gabon, Gambia, Ghana, Guinea Bissau, Guinea, Ivory Coast, Nigeria, Senegal, Sierra Leone, Togo, Zaire (Africa)

Distribution overview: West Africa.

Common uses: Chairs, Chests, Concealed parts (Furniture), Cooperages, Core Stock, Decorative plywood, Decorative veneer, Desks, Dining-room furniture, Domestic flooring, Dowell pins, Dowells, Drawer sides, Excelsior, Figured veneer, Fine furniture, Floor lamps, Flooring, Furniture , Furniture components, Furniture squares or stock, Hatracks, Joinery, Kitchen cabinets, Living-room suites, Office furniture, Parquet flooring, Plain veneer, Plywood, Radio - stereo - TV cabinets, Rustic furniture, Stools, Sub-flooring, Tables , Utility furniture, Veneer, Wardrobes

Product sources: The ITTO reports that timber from this species is produced occasionally. The material is being promoted on the export market.

Environment profile: Very little threat to its natural environment.

Colors: the heart isRed, Yellowish brownand the sapwoodColor not distinct from heartwood, Pale yellowish brown.The grain isStraight, the textureMedium coarse to coarseand the lusterLustrous

Natural durability: Sapwood susceptible to attack by powder post beetles, Very low natural resistance to decay fungi

Odor: No specific smell or taste

Kiln Schedules: T6 - D2 (4/4) US

Drying Defects: Expect resin/gum exudation, Severe surface checking

Ease of Drying: Thick Stock Requires Care

Comments: Abnormal Wood Tissue Some authorities identify this species and B. zenkeri as the same, i.e., B. laurentii = B. zenkeri . Tension wood may be present. Material containing tension wood is highly prone to distortion during drying

Blunting Effect: Moderate

Boring: Fairly difficult to very difficult

Carving: Fairly Difficult to Very Difficult

Cutting Resistance: Fairly Difficult to Very Difficult to saw

Gluing: Very good properties

Mortising: Fairly Difficult to Very Difficult

Moulding: Fairly Difficult to Very Difficult Oulding properties are good

Movement in Service: Fairly Difficult to Very Difficult Oulding properties are good

Nailing: Nails well without pre-boring, Pre-Boring Recommended

Planing: Fairly Difficult to Very Difficult

Resistance to Impregnation: Sapwood is permeable

Response to hand tools: Fairly Difficult to Difficult to Work

Routing recessing: Fairly Difficult to Very Difficult

Sanding: Good sanding finish

Steam bending: Good

Screwing: Pre-boring recommended ; Turning: Fairly Difficult to Very Difficult

Painting: Good; Polishing: Smooth finish; Staining: Stains well and easily ; Varnishing: Good;

  • Numerical data Metric
  • Numerical data English
  • Strength properties
  • References
Item Green Dry Metric
Specific Gravity 0,48
Density 592 kg/m3
Bending Strength 746 982 kg/cm2
Crushing Strength 378 477 kg/cm2
Hardness 524 kg
Impact Strength cm
Shearing Strength kg/cm2
Stiffness 94 98 1000 kg/cm2
Tangential Shrinkage %
Radial Shrinkage %
Weight kg/m3
Maximum Load cm-kg/cm3
Toughness cm-kg
Static Bending kg/cm2
Item Green Dry English
Bending Strength 10613 13977 psi
Density 37 lbs/ft3
Hardness 1156 lbs
Maximum Crushing Strength 5381 6788 psi
Stiffness 1343 1398 1000 psi
Specific Gravity 0.48
Weight 51 40 lbs/ft3

Resists denting and marring
Max. crushing strength = high
Heavy
Hardness = medium
Density = high
Compression strength (parallel to grain) = high
Bending strength (MOR) = high

Bolza, E., Keating, W.G.,1972,African Timbers - the Properties, Uses and Characteristics of 700 Species,C.S.I.R.O. Div. of Building ResearchChudnoff, M.,1984,Tropical Timbers of the World,U.S.A. Department of Agriculture, Forest Service, Forest Products,Laboratory, Madison.ITTO.1986.Tropical Timber Atlas, Volume 1 - Africa.International Tropical Timber Organization (ITTO) and Centre Technique Forestier Tropical (CTFT, 45bis, Avenue de la Belle Gabrielle, Nogent-sur-Marne Cedex, France.Lavers, G. M.1966.The Strength Properties of Timbers.Forest Products Research Bulletin, No. 50. Ministry of Technology, Her Majesty's Stationery Office, London.Lincoln, W.A. 1986. World Woods in Color. Linden Publishing Co. Inc., Fresno, California.WCMC. 1992. Conservation Status Listing - Trees and Timbers of the World. World Conservation Monitoring Center-Plants Programme, Cambridge, CB3 ODL, United Kingdom.
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