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Corkwood
Corkwood (Ricinodendron rautanenii)

Family: Euphorbiaceae

Common names: Corkwood, Erimado, Essessang, False balsa, Muganga, Mugongo, Mukusu, Munclalama, Mungoma, Mungongo, Muoma, Ndubalula, Ngoma, Omunquete, Rhodesian balsa, Umganuompobola, Umgoma, Umgongo, Wild almond

Distributed in: Botswana, Congo, Tanzania, Zaire, Zambia, Zimbabwe (Africa)

Common uses: Agricultural implements, Boat building (general), Boxes and crates, Canoes, Carvings, Drawing boards, Mathematical instruments, Plywood corestock, Plywood, Pulp/Paper products, Sporting Goods, Toys

Tree size: Tree height is 20-30 m

Colors: the heart isWhite to cream, Yellow to golden-yellow to orangeand the sapwoodSame as heartwood, White.The grain isWeak figure, the textureFine

Natural durability: Susceptible to insect attack, Susceptible to marine borer attack

Kiln Schedules: UK=K US=T13C4S/T11D3S

Kiln Drying Rate: Rapid (<10 days for boards < 32 mm, to <30 days for boards >= 63 mm)

Drying Defects: Distortion, Splitting

Blunting Effect: Blunting effect on machining is fairly severe

Cutting Resistance: Cutting Resistance with green wood is easy

Gluing: Fairly Easy to Very Easy

Nailing: Easy to nail, Pre-Boring Recommended

Planing: Very Good to Excellent

Resistance to Impregnation: Resistant sapwood

Response to hand tools: Easy to machine

Turning: Fairly Easy to Very Easy

Painting: Very Good to Excellent; Polishing: Very Good to Excellent; Varnishing: Very Good to Excellent;

  • Numerical data Metric
  • Numerical data English
  • Strength properties
  • References
Item Green Dry Metric
Specific Gravity
Density 144 kg/m3
Bending Strength 208 307 kg/cm2
Crushing Strength 63 122 kg/cm2
Hardness 144 kg
Impact Strength cm
Shearing Strength kg/cm2
Stiffness 71 84 1000 kg/cm2
Tangential Shrinkage %
Radial Shrinkage 2 %
Weight 144 128 kg/m3
Maximum Load cm-kg/cm3
Toughness cm-kg
Static Bending kg/cm2
Item Green Dry English
Bending Strength 2959 4369 psi
Density 9 lbs/ft3
Hardness 319 lbs
Maximum Crushing Strength 902 1745 psi
Stiffness 1017 1199 1000 psi
Weight 9 8 lbs/ft3
Radial Shrinkage 2 %
Tangential Shrinkage 4 %

Density (dry weight)=less than 15 lbs/cu.ft. 0
Max. crushing strength (stiffness) = very low
Bending strength (MOR) = very low
Hardness (side grain) = very soft
Density (dry weight) = 15-22 lbs/cu. ft.
Shrinkage, Tangential = very small
Shrinkage, Radial = very small
Shrinkage, Tangential = small
Shrinkage, Radial = small
Max. crushing strength = low
Bending strength (MOR) = low

Armstrong, F.H.,1960,The Strength Properties of Timber,Forest Products Research Laboratory, London Bulletin,No.45Bolza, E., Keating, W.G.,1972,African Timbers - the Properties, Uses and Characteristics of 700 Species,C.S.I.R.O. Div. of Building ResearchFanshawe, D.B.,1962,Fifty Common Trees of Northern Rhodesia,Natural Resources Board and Forestry Department, NdolaFerreirinha, M.P.,1956,Madeiras do Ultramar Portugues,Garcia de Orta Revista da Junta Missoes Geog...,4(1,pp95-6Forests Products Research Laboratory, U.K.,1956,A Handbook of Hardwoods,Forest Products Research Laboratory, Princes Risborough, Department of,Science and Industrial Research, Building Research EstablishmentGoldsmith, B., Carter, D.T.,1981,The Indigenous Timbers of Zimbabwe,Forestry Commission, Zimbabwe Research Bulletin No.9Jane, F.W.,1954,The Structure of World Timbers - 21 Muganga Musine Pilon and Hura,Timber Technology,62(2175, pp15-17Lavers, G.M.,1983,The Strength Properties of Timber (3rd ed. revised Moore G.L.,Forest Products Research Laboratory, Princes Risborough, Building Research,Establishment Report (formerly Bulletin No.50)Pardy, A.A.,1952,Notes on Indigenous Trees and Shrubs of S. Rhodesia (Ricinodendron,rautanenii,Ministry of Agriculture and Lands S. Rhodesia Bulletin,No.1686Scott, M.H.,1950,Notes on the more Important African Timbers Imported into the Union with,Special Ref. to Port. E.A. Species,Journal of the South African Forestry Association,No.19,pp18-62,[South,African Forestry Journal]Takahashi, A.,1978,Compilation of Data on the Mechanical Properties of Foreign Woods (Part,III) Africa,Shimane University, Japan, Research Report on Foreign Wood No. 7Timber Information Assoc. Ltd.,1947,Notes on East African Timbers,TRADA, Timber Information, No.28Zambia Forestry Department,1979,Timbers of Zambia Ricinodendron rautanenii and Trichilia emetica,Zambia Forestry Department, Division of Forest Products Research, Timbers,of Zambia - Technical note
*Come interpretare i dati (manleva su eventuali imprecisioni)