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Duabiri
Duabiri (Polyalthia oliveri)

Family: Annonaceae

Common names: Duabiri, Pe-ohn

Distributed in: Benin, Cameroon, Gabon, Ghana, Ivory Coast, Liberia, Nigeria, Sierra Leone, Tanzania, Togo (Africa)

Environment profile: Rare

Tree size: Trunk diameter is 100-150 cm

Colors: the heart isWhite, Yellow to golden-yellow to orangeand the sapwoodWhite, Yellow.The grain isStriped figure, the textureMediumand the lusterLustrous

Natural durability: Perishable, Susceptible to insect attack

Odor: Has an odor

Drying Defects: Moderate surface checking, Uneven Moisture Content

Ease of Drying: Variable

Comments: General finishing qualities are rated as good

Boring: Fairly easy to very easy

Cutting Resistance: Easy to saw

Gluing: Very Good to Excellent Results

Mortising: Poor to Very Poor

Moulding: Poor to Very Poor

Movement in Service: Poor to Very Poor

Nailing: Poor to Very Poor , Very Good to Excellent

Planing: Fairly Easy to Very Easy

Resistance to Impregnation: Resistant sapwood

Response to hand tools: Fairly Difficult to Difficult to Work

Sanding: Poor to Very Poor Results

Veneering qualities: Veneers easily, Veneers moderately easy

Steam bending: Fairly Easy to Very Easy

Screwing: Poor to Very Poor Results, Very Good to Excellent Results; Turning: Very Good to Excellent Results

Painting: Very Good to Excellent; Polishing: Very Good to Excellent; Staining: Fair to Good;

  • Numerical data Metric
  • Numerical data English
  • Strength properties
  • References
Item Green Dry Metric
Specific Gravity
Density kg/m3
Bending Strength 954 1473 kg/cm2
Crushing Strength kg/cm2
Hardness kg
Impact Strength cm
Shearing Strength kg/cm2
Stiffness 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 13576 20956 psi
Stiffness 2167 2494 1000 psi

Modulus of Elasticity (stiffness) = high
Bending strength (MOR) = high

Cooper, G.P., Record, S.J.,1931,The Evergreen Forests of Liberia,Yale School Forestry Bulletin,31,pp1-153Irvine, F.R.,1961,Woody Plants of Ghana,O.U.P. LondonKeay, R.W.J., et al,1960,Nigerian Trees Vol.1,Nigeria Federal Department of Forest Research, Ibadan
*Come interpretare i dati (manleva su eventuali imprecisioni)