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Ditta 5
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BonBon
Bon (Cordia spp.)

Family: Boraginaceae

Common names: Bon, Ebe, Ebois, Kyenboa, Omo, Tweneboa, West African cordia

Distributed in: Cameroon, Gabon, Ivory Coast, Nigeria, Sierra Leone, Uganda (Africa)

Common uses: Agricultural implements, Boat building (general), Boxes and crates, Carvings, Furniture, Joinery, Light construction, Millwork, Musical instruments, Plywood, Poles, Posts, Pulp/Paper products, Vehicle parts, Veneer: decorative

Environment profile: Rare

Tree size: Trunk diameter is 100-150 cm

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

Natural durability: Susceptible to insect attack, Very durable

Odor: Has an odor

Silica Content: Siliceous

Kiln Schedules: UK=K US=T13C4S/T11D3S

Kiln Drying Rate: Naturally dries quickly

Drying Defects: Slight twist/warp, Splitting

Ease of Drying: Slowly

Tree Identification: Bole/stem form is misshapen

Blunting Effect: Moderate

Boring: Fairly easy to very easy

Carving: Fairly Easy to Very Easy

Cutting Resistance: Fairly Difficult to Very Difficult to saw

Gluing: Fairly Easy to Very Easy

Mortising: Fairly Easy to Very Easy

Moulding: Fairly Easy to Very Easy

Movement in Service: Fairly Easy to Very Easy

Nailing: Fair to Good , Fairly Easy to Very Easy

Planing: Fairly Easy to Very Easy

Resistance to Impregnation: Permeable sapwood

Response to hand tools: Fairly Difficult to Difficult to Work

Routing recessing: Fairly Easy to Very Easy

Veneering qualities: Suitable for peeling, Suitable for slicing

Steam bending: Poor to Very Poor Results

Screwing: Fair to Good Results, Fairly Easy to Very Easy; Turning: Fairly Easy to Very Easy

Painting: Very Good to Excellent; Polishing: Fair to Good; Staining: Finish is generally satisfactory ; Varnishing: Very Good to Excellent;

  • Numerical data Metric
  • Numerical data English
  • Strength properties
  • References
Item Green Dry Metric
Specific Gravity
Density 865 kg/m3
Bending Strength 617 961 kg/cm2
Crushing Strength 233 391 kg/cm2
Hardness 298 kg
Impact Strength cm
Shearing Strength kg/cm2
Stiffness 83 97 1000 kg/cm2
Tangential Shrinkage 4 %
Radial Shrinkage 3 %
Weight 849 689 kg/m3
Maximum Load cm-kg/cm3
Toughness cm-kg
Static Bending kg/cm2
Item Green Dry English
Bending Strength 8777 13675 psi
Density 54 lbs/ft3
Hardness 657 lbs
Maximum Crushing Strength 3324 5570 psi
Stiffness 1188 1383 1000 psi
Weight 53 43 lbs/ft3
Radial Shrinkage 3 %
Tangential Shrinkage 4 %
Volumetric Shrinkage 9 %

Shrinkage, Tangential = very small
Shrinkage, Radial = small
Shrinkage, Volumetric = small
Shrinkage, Radial = very small
Max. crushing strength = medium
Bending strength (MOR) = low
Shrinkage, Volumetric = very small
Shrinkage, Volumetric = moderate
Shrinkage, Volumetric = fairly large
Shrinkage, Tangential = small
Modulus of Elasticity (stiffness) = very low
Modulus of Elasticity (stiffness) = low
Max. crushing strength = low
Hardness (side grain) = very soft
Hardness (side grain) = soft
Density (dry weight) = 61-67 lbs/cu. ft.
Density (dry weight) = 53-60 lbs/cu. ft.
Density (dry weight) = 46-52 lbs/cu. ft.
Bending strength (MOR) = medium
Max. crushing strength = 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.Farmer, R.H.,1972,Handbook of Hardwoods,HMSOHughes, J.F.,1971,The Principal Timber Trees of Cameroon,Unpublished dataSallenave, P.,1955,Proprietes Phyiques et Mecaniques des Bois Tropicaux de l'Union Francaise,C.T.F.T
*Come interpretare i dati (manleva su eventuali imprecisioni)