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Amuutu
Amuutu (Croton macrostachyus)

Family: Euphorbiaceae

Common names: Amuutu, Ifurufuru, Mehunduzi, Mfirifiri, Mfurufuru, Mpululu, Mshunduzi, Mukuruguru, Mulangu, Mulemgu, Mulugu, Murangala, Musine, Musogasoga, Mutsutsu, Mutundu, Mutundu-nigura, Mutuntu, Muyemberera, Negeul, Tebesuet, Toboswa, Yalula

Distributed in: Cameroon, Congo, Kenya, Tanzania, Uganda (Africa)

Common uses: Boxes and crates, Cabinetmaking, Flooring, Furniture, Joinery, Light construction, Matches, Particleboard, Plywood, Posts, Veneer: decorative

Colors: the heart isYellow, Yellow to golden-yellow to orangeand the sapwoodSame as heartwood .The grain isWavy, the textureUniformand the lusterDull

Natural durability: Susceptible to marine borer attack, Very durable

Odor: Has an odor

Kiln Schedules: Drying (speed) is fast

Drying Defects: Severe surface checking, Severe twisting/warping

Ease of Drying: Reconditioning Treatement

Tree Identification: Bole/stem form is straight

Blunting Effect: Little

Boring: Poor to very poor results

Cutting Resistance: Cutting Resistance with green wood is easy

Gluing: Very Good to Excellent Results

Mortising: Fairly Easy to Very Easy

Moulding: Fairly Easy to Very Easy

Movement in Service: Fairly Easy to Very Easy

Nailing: Fairly Easy to Very Easy, Very Good to Excellent

Planing: Planes well, to a good finish

Resistance to Impregnation: Sapwood is permeable

Response to hand tools: Responds Readily

Steam bending: Poor to Very Poor Results

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

Polishing: Fair to Good; Staining: Fair to Good;

  • Numerical data Metric
  • Numerical data English
  • Strength properties
  • References
Item Green Dry Metric
Specific Gravity
Density 512 kg/m3
Bending Strength 429 674 kg/cm2
Crushing Strength 275 449 kg/cm2
Hardness kg
Impact Strength cm
Shearing Strength 109 kg/cm2
Stiffness 95 110 1000 kg/cm2
Tangential Shrinkage %
Radial Shrinkage 2 %
Weight 496 400 kg/m3
Maximum Load cm-kg/cm3
Toughness cm-kg
Static Bending kg/cm2
Item Green Dry English
Bending Strength 6111 9589 psi
Density 32 lbs/ft3
Maximum Crushing Strength 3916 6397 psi
Shearing Strength 1560 psi
Stiffness 1358 1568 1000 psi
Weight 31 25 lbs/ft3
Radial Shrinkage 2 %
Tangential Shrinkage 5 %

Density (dry weight) = 31-37 lbs/cu. ft.
Shrinkage, Tangential = very small
Shrinkage, Radial = very small
Shearing strength (parallel to grain) = low
Modulus of Elasticity (stiffness) = low
Max. crushing strength = medium
Bending strength (MOR) = low
Shrinkage, Tangential = small
Density (dry weight) = 38-45 lbs/cu. ft.
Density (dry weight) = 23-30 lbs/cu. ft.

Bolza, E., Keating, W.G.,1972,African Timbers - the Properties, Uses and Characteristics of 700 Species,C.S.I.R.O. Div. of Building ResearchBryce, J.M.,1967,Commercial Timbers of Tanzania,Tanzanian Forestry Division Util. Sec. MoshiEggeling, W.J.,1940,Indigenous Trees of Uganda,Govt. Printer Entebbe UgandaFrance - C.T.F.T./C.T.B.,1982,Guide pour le Choix des Essences Deroulables-pour la fabrication du,contreplaque,C.T.F.T./C.T.B. FranceIrvine, 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, IbadanMcCoy-Hill, M.,1955,Timbers of Tanganyika - Mulugu and Mkaraka,Timber Technology,63(2187, p20Patterson, D.N.,1963,The strength of Kenya timbers, their derivation and application,Kenya Forestry Department Research Bulletin,No.23Tanzania Forest Division,1966,Croton macrostachys (Mutundu,Tanzania Forest Div. Util. Sec. Moshi - Timbers of TanganyikaUnited Kingdom - H.M.S.O.,1954,Report of the Matchwood Working Party,H.M.S.O. for the Board of Trade and Ministry of MaterialsWimbush, S.H.,1950,Catalogue of Kenya Timbers,Govt. Printer Nairobi Kenya
*Come interpretare i dati (manleva su eventuali imprecisioni)