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Sugar-plum
Sugar-plum (Uapaca sp.)

Family: Euphorbiaceae

Common names: Abo Emido, Borikio, Rikio, Rikio Riviere, Sugar-plum, Yeye

Distributed in: Cameroon, Ivory Coast, Nigeria (Africa)

Distribution overview: Growth range of species in the genus Uapaca is confined to tropical Africa and Madagascar. Some species develop aerial and stilt-roots since they are usually found in swampy areas and near water. Other species grow on the edges of savannah forests.

Common uses: Balusters, Boat building, Building construction, Building materials, Canoes, Charcoal, Construction, Domestic flooring, Flooring, Fuelwood, Interior construction, Lifeboats, Light construction, Moldings, Parquet flooring, Shipbuilding, Stairworks, Stringers, Sub-flooring

Environment profile: Status has not been officially assessed

Tree size: Tree height is 20-30 m

Colors: the heart isPale brown, Reddish brownand the sapwoodColor not distinct from heartwood, Pale straw.The grain isStraight, the textureMedium to coarse and the lusterLow

Natural durability: Heartwood resistant to decay Resistant to attack by termites

Odor: No specific smell or taste

Silica Content: Contains high levels of silica (> 0.5% of dry weight)

Drying Defects: Shakes, Splitting

Ease of Drying: Rapidly

Comments: Bears edible fruit

Blunting Effect: Rapid dulling of tools

Cutting Resistance: Generally difficult to saw because of density and high silica content. Saw blades tend to heat up

Gluing: Satisfactory gluing properties

Nailing: Holds nails well, Pre-boring required

Planing: Very difficult to work in most operations. Planing sometimes yields fuzzy surfaces

Resistance to Impregnation: Sapwood is permeable

Response to hand tools: Poor response to hand tools

Sanding: Fairly good sanding characteristics



  • Numerical data Metric
  • Numerical data English
  • Strength properties
  • References
Item Green Dry Metric
Specific Gravity 0,59
Density 721 kg/m3
Bending Strength 1168 kg/cm2
Crushing Strength 521 kg/cm2
Hardness kg
Impact Strength cm
Shearing Strength kg/cm2
Stiffness 146 1000 kg/cm2
Tangential Shrinkage 10 %
Radial Shrinkage 5 %
Weight 705 576 kg/m3
Maximum Load cm-kg/cm3
Toughness cm-kg
Static Bending kg/cm2
Item Green Dry English
Bending Strength 16619 psi
Density 45 lbs/ft3
Maximum Crushing Strength 7417 psi
Stiffness 2089 1000 psi
Specific Gravity 0.59
Weight 44 36. lbs/ft3
Radial Shrinkage 5 %
Tangential Shrinkage 10 %
Volumetric Shrinkage 14 %

High bending strength, compression strenght parallel to grain in air dry is high, high density

Chudnoff, M.,1984,Tropical Timbers of the World,U.S.A. Department of Agriculture, Forest Service, Forest Products,Laboratory, Madison.Keay, R.W.J.1989. Trees of Nigeria.Revised Version of Nigerian Trees. Clarendon Press, Oxford.
*Come interpretare i dati (manleva su eventuali imprecisioni)