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Ditta 5
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Bongo
Bongo (Fagara heitzii)

Family: Rutaceae

Common names: Bongo, Boungou petites feuilles, Kamasumu, Leichtes olon, Lisumba, Lomogo, Lomvoura, M'banza, Mongo, N'dungu, N'goung, Nlo-mvoge, Nongo, Nongo-mpolo, Nungo, Okanham, Olon, Olon tendre, Olong, Soft olong

Distributed in: Angola, Cameroon, Congo, Equatorial Guinea, Gabon, Ivory Coast, Liberia, Sierra Leone, Zaire (Africa)

Common uses: Boat building (general), Boxes and crates, Cabinetmaking, Flooring, Furniture, Joinery, Light construction, Moldings, Paneling, Particleboard, Plywood, Pulp/Paper products, Turnery, Veneer: decorative

Tree size: Trunk diameter is 150-200 cm

Colors: the heart isRed, Yellow to golden-yellow to orangeand the sapwoodPaler than heartwood, Pink.The grain isInterlocked, the textureMediumand the lusterLustrous

Natural durability: Susceptible to attack from termites (Isoptera), Susceptible to marine borer attack

Kiln Schedules: Drying (speed) is fast

Drying Defects: No end splitting, Slight end splitting

Ease of Drying: Easy

Tree Identification: Bole/stem form is straight

Comments: General finishing qualities are rated as good

Boring: Easy

Cutting Resistance: Easy to saw

Gluing: Fairly Easy to Very Easy

Mortising: Easy to mortise

Moulding: Easy to mould

Movement in Service: Easy to mould

Nailing: Fairly Easy to Very Easy, Holds nails well

Planing: Difficult to plane

Resistance to Impregnation: Sapwood is moderately resistant

Response to hand tools: Easy to machine

Veneering qualities: Good gluing qualities, There is slight to moderate drying degrade and the potential for buckles and splits

Screwing: Easy to screw, Screwing yields good results; Turning: Easy to turn

Painting: Good; Polishing: Good; Varnishing: Good;

  • Numerical data Metric
  • Numerical data English
  • Strength properties
  • References
Item Green Dry Metric
Specific Gravity
Density 512 kg/m3
Bending Strength 663 1036 kg/cm2
Crushing Strength 275 449 kg/cm2
Hardness 220 kg
Impact Strength cm
Shearing Strength 62 kg/cm2
Stiffness 83 97 1000 kg/cm2
Tangential Shrinkage 6 %
Radial Shrinkage 3 %
Weight 496 400 kg/m3
Maximum Load cm-kg/cm3
Toughness cm-kg
Static Bending kg/cm2
Item Green Dry English
Bending Strength 9443 14742 psi
Density 32 lbs/ft3
Hardness 487 lbs
Maximum Crushing Strength 3916 6397 psi
Shearing Strength 882 psi
Stiffness 1188 1383 1000 psi
Weight 31 25 lbs/ft3
Radial Shrinkage 3 %
Tangential Shrinkage 6 %
Volumetric Shrinkage 10 %

Shrinkage, Tangential = small
Shrinkage, Radial = small
Bending strength (MOR) = medium
Max. crushing strength = medium
Shrinkage, Volumetric = moderate
Hardness (side grain) = very soft
Density (dry weight) = 31-37 lbs/cu. ft.
Shrinkage, Tangential = very small
Shrinkage, Radial = very small
Shearing strength (parallel to grain) = very low
Modulus of Elasticity (stiffness) = very low
Modulus of Elasticity (stiffness) = low
Shrinkage, Volumetric = small
Shrinkage, Tangential = moderate
Shrinkage, Tangential = fairly large
Shrinkage, Radial = moderate
Hardness (side grain) = soft
Density (dry weight) = 38-45 lbs/cu. ft.
Density (dry weight) = 23-30 lbs/cu. ft.
Bending strength (MOR) = low
Bending strength (MOR) = high

Barreto, L.S.,1967,Madeiras de Mocambique - Estrutura do Lenho,Universitarios de Mocambique Serie, 1Bois et Forets des Tropiques,1949,Olon (Fagara heitzii and Fagara brieyi,Bois et Forets des Tropiques,No.10,pp175-8Bois et Forets des Tropiques,1980,Olon (Fagara heitzii,Bois et Forets des Tropiques,No.191,pp47-57Bolza, E., Keating, W.G.,1972,African Timbers - the Properties, Uses and Characteristics of 700 Species,C.S.I.R.O. Div. of Building ResearchErfurth, 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./C.T.B.,1982,Guide pour le Choix des Essences Deroulables-pour la fabrication du,contreplaque,C.T.F.T./C.T.B. FranceFrance - C.T.F.T.,1966,Bois Tropicaux,C.T.F.T. Publ.,12France - C.T.F.T.,1977,Promotion of African Timbers - New Species,CTFT,35 LeafletsHughes, J.F.,1971,The Principal Timber Trees of Cameroon,Unpublished dataJay, B.A.,1968,Timbers of West Africa,TRADA, Red Booklet SeriesSallenave, P.,1955,Proprietes Phyiques et Mecaniques des Bois Tropicaux de l'Union Francaise,C.T.F.TSallenave, P.,1964,Proprietes Physiques et Mecaniques des Bois Tropicaux (Premier Supplement,C.T.F.T. Publ.,no.23Takahashi, A.,1978,Compilation of Data on the Mechanical Properties of Foreign Woods (Part,III) Africa,Shimane University, Japan, Research Report on Foreign Wood No. 7Wood, B., Calnan, D.,1976,Toxic Woods,British Journal of Dermat 94 Suppl. 13
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