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Ditta 5
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Abura
Abura (Mitragyna rubrostipulacea)

Family: Rubiaceae

Common names: Abura, Mromberomba, Mromberombbe, Muho, Munyzmaizi, Mutoro, Mutororo, Muzingu, Nazingu, Ngomera, Nzin, Nzingu, Obul, Omuzito, Oo, Romberombe

Distributed in: Tanzania, Uganda (Africa)

Common uses: Boxes and crates, Cabinetmaking, Carvings, Flooring, Furniture, Joinery, Light construction, Moldings, Plywood corestock, Plywood, Pulp/Paper products, Toys, Vats, Veneer, Veneer: decorative

Tree size: Tree height is 20-30 m

Colors: the heart isWhite to cream, Yellowand the sapwoodWhite, Yellow.The grain isWeak figure, the textureMediumand the lusterDull

Natural durability: Susceptible to attack from termites (Isoptera), Susceptible to insect 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: Slight twist/warp, Splitting

Ease of Drying: Rapidly

Tree Identification: Bole/stem form is not buttressed

Blunting Effect: Blunting effect on machining is slight

Cutting Resistance: Easy to saw

Gluing: Fairly Easy to Very Easy

Moulding: Good finishing

Movement in Service: Good finishing

Nailing: Fairly Easy to Very Easy, Holds satisfactorily

Planing: Good planing finish

Resistance to Impregnation: Sapwood is permeable

Response to hand tools: Easy to machine

Veneering qualities: Veneers easily, Veneers moderately easy

Steam bending: Very Good to Excellent Results

Screwing: Fairly Easy to Very Easy ; Turning: Difficult to turn

Painting: Good; Polishing: Very Good to Excellent; Staining: Finish is generally satisfactory;

  • Numerical data Metric
  • Numerical data English
  • Strength properties
  • References
Item Green Dry Metric
Specific Gravity
Density 528 kg/m3
Bending Strength 429 674 kg/cm2
Crushing Strength 275 449 kg/cm2
Hardness 451 kg
Impact Strength 71 cm
Shearing Strength 62 kg/cm2
Stiffness 95 110 1000 kg/cm2
Tangential Shrinkage %
Radial Shrinkage 4 %
Weight 512 400 kg/m3
Maximum Load cm-kg/cm3
Toughness cm-kg
Static Bending kg/cm2
Item Green Dry English
Bending Strength 6111 9589 psi
Density 33 lbs/ft3
Hardness 995 lbs
Impact Strength 28 inches
Maximum Crushing Strength 3916 6397 psi
Shearing Strength 882 psi
Stiffness 1358 1568 1000 psi
Weight 32 25 lbs/ft3
Radial Shrinkage 4 %
Tangential Shrinkage 7 %

Density (dry weight) = 31-37 lbs/cu. ft.
Shrinkage, Radial = small
Shrinkage, Radial = fairly large
Max. crushing strength = medium
Bending strength (MOR) = low
Toughness-Hammer drop (Impact Strength) = low
Shrinkage, Radial = moderate
Shearing strength (parallel to grain) = very low
Modulus of Elasticity (stiffness) = low
Hardness (side grain) = soft
Shrinkage, Radial = very small
Shrinkage, Radial = large
Density (dry weight) = 38-45 lbs/cu. ft.
Density (dry weight) = 23-30 lbs/cu. ft.
Shrinkage, Tangential = moderate

Bois, P.J.,1966,The Strength Properties of Tanzania Timbers,Tanzania Forest Div. Util. Sec. Moshi Tech. Note, No.35Bolza, 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. FranceGrant, D.K.S.,1934,Some Local Timbers,Tanzania Forest DepartmentMurira, K.,1984,Natural Durability Tests of Tanzanian Timbers 1955 - 1982,Tanzania Forestry Research Institute, Timber Utilisation Research Centre,,Moshi.Tack, C.H.,1969,Uganda Timbers,Govt. Printer UgandaTakahashi, A.,1978,Compilation of Data on the Mechanical Properties of Foreign Woods (Part,III) Africa,Shimane University, Japan, Research Report on Foreign Wood No. 7Tanzania Forest Division,1966,Kiln Drying Schedules for Tanzania Timbers Technical Note no.38,Tanzania Forest Div. Util. Sec. MoshiTanzania Forest Division,1966,Mitragyna rubrostipulata (nzingu/mromberombe,Tanzania Forest Div. Util. Sec. Moshi - Timbers of TanganyikaUganda Forest Department,1954,Abura (Mitragyna stipulosa and Mitragyna rubrostipulata,Uganda Forest Div. Util. Sec. Timber Leaflet,No.6
*Come interpretare i dati (manleva su eventuali imprecisioni)