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Asamantawa
Asamantawa (Bussea occidentalis)

Family: Leguminosae

Common names: Asamantawa, Atawa, Ateretere, Bingbe, Bonaminta, Boomoue, Dabugrohi, Dahn-kay, Helei, Hilei, Kotoprepre, Mamamarawa, Mamarawa, Muniele, Musambanyoka, Muteta, Muzeze, Mwikalankanga, Nali sekahi, Nomotcho, Pahkloh, Rhodesian black watte, Rhodesian wattle, Samanta, Samante, Silo, Takorowa, Umsehla

Distributed in: Ghana, Guinea, Ivory Coast, Liberia, Sierra Leone, South Africa, Zimbabwe (Africa)

Common uses: Agricultural implements, Boxes and crates, Carvings, Fuelwood, Furniture, Heavy construction, Light construction, Mine timbers, Tool handles, Turnery, Vehicle parts

Tree size: Tree height is 30-40 m

Colors: the heart isWhite, Yellow to golden-yellow to orangeand the sapwoodWhite, White to yellow.The grain isWavy, the textureMedium to coarseand the lusterMedium

Natural durability: Sapwood is susceptible to wood staining fungal attack, Susceptible to attack from termites (Isoptera)

LightInduced Color Change: Darker

Kiln Schedules: Dry at a slow speed

Drying Defects: Moderate surface checking, Moderate twist/warp

Ease of Drying: Easy

Tree Identification: Bole/stem form is straight

Comments: General finishing qualities are rated as good

Cutting Resistance: Cutting Resistance with dry wood is easy

Gluing: Easy to glue

Mortising: Easy to mortise

Moulding: Easy to mould

Movement in Service: Easy to mould

Nailing: Holds nails well, Possible if prebored

Planing: Planes well, to a good finish

Resistance to Impregnation: Heartwood is moderately resistant

Resistance to Splitting: Poor

Response to hand tools: Variable qualities

Sanding: Difficult to sand

Turning: Easy to turn

Polishing: Very Good to Excellent; Varnishing: Good;

  • Numerical data Metric
  • Numerical data English
  • Strength properties
  • References
Item Green Dry Metric
Specific Gravity
Density 817 kg/m3
Bending Strength 849 1313 kg/cm2
Crushing Strength 432 636 kg/cm2
Hardness 1139 kg
Impact Strength cm
Shearing Strength 155 kg/cm2
Stiffness 132 152 1000 kg/cm2
Tangential Shrinkage 6 %
Radial Shrinkage 3 %
Weight 801 737 kg/m3
Maximum Load cm-kg/cm3
Toughness cm-kg
Static Bending kg/cm2
Item Green Dry English
Bending Strength 12082 18683 psi
Density 51 lbs/ft3
Hardness 2513 lbs
Maximum Crushing Strength 6153 9058 psi
Shearing Strength 2205 psi
Stiffness 1880 2171 1000 psi
Weight 50 46 lbs/ft3
Radial Shrinkage 3 %
Tangential Shrinkage 6 %
Volumetric Shrinkage 13 %

Density (dry weight) = 61-67 lbs/cu. ft
Bending strength (MOR) = high
Modulus of Elasticity (stiffness) = high
Max. crushing strength = high
Hardness (side grain) = very hard
Density (dry weight) = 67-75 lbs/cu.ft
Density (dry weight) = 46-52 lbs/cu. ft.
Shrinkage, Volumetric = fairly large
Shrinkage, Tangential = very small
Shrinkage, Tangential = fairly large
Shrinkage, Radial = very small
Shrinkage, Radial = fairly large
Shearing strength (parallel to grain) = medium
Modulus of Elasticity (stiffness) = very low
Max. crushing strength = medium
Hardness (side grain) = medium
Density (dry weight) = 53-60 lbs/cu. ft
Density (dry weight) = 38-45 lbs/cu. ft.
Bending strength (MOR) = low

Banks, C.H., Schoeman, J.P., Otto, K.P.,1977,The Mechanical Properties of Timbers with particular reference to South,Africa,South African Forestry Research Institute Bulletin,(Ed.,Schoeman, J.P. 1973 & Otto K.P. 1976,No.48Cooper, G.P., Record, S.J.,1931,The Evergreen Forests of Liberia,Yale School Forestry Bulletin,31,pp1-153Dalziel, J.M.,1937,The Useful Plants of West Tropical Africa,Crown Agents for the ColoniesDudek, S.,1981,Lesser Known Liberian Timber Species,German Agency for Technical Cooperation GermanyFanshawe, D.B.,1962,Fifty Common Trees of Northern Rhodesia,Natural Resources Board and Forestry Department, NdolaGoldsmith, B., Carter, D.T.,1981,The Indigenous Timbers of Zimbabwe,Forestry Commission, Zimbabwe Research Bulletin No.9Irvine, F.R.,1961,Woody Plants of Ghana,O.U.P. LondonKryn, J.M., Forbes, E.W.,1959,The Woods of Liberia,U.S.A. Department of Agriculture,Forest Products Laboratory, Madison,,Report No. 2159Pardy, A.A.,1952,Notes on Indigenous Trees and Shrubs of S. Rhodesia - Peltophorum,africanum,Ministry of Agriculture and Lands S. Rhodesia Bulletin,No.1665Savill, P.S., Fox, J.E.D.,1967,Trees of Sierra LeoneScott, M.H.,1935,Weights of South African Growth Timbers,South African Department of Agriculture and Forestry Bulletin,No.145,Forest Products Institute, Forestry Series No.1Takahashi, A.,1978,Compilation of Data on the Mechanical Properties of Foreign Woods (Part,III) Africa,Shimane University, Japan, Research Report on Foreign Wood No. 7Voorhoeve, A.G.,1965,Liberian High Forest Trees,Centre for Agric. Publishing and Documentation, Wageningen
*Come interpretare i dati (manleva su eventuali imprecisioni)