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Black bark
Black bark (Diospyros abyssinica)

Family: Ebenaceae

Common names: Black bark, Blidzo, Blonyateo, Chatuyet, Cheptua, Cheptuiyet, Gbliteo, Giant diospyros, Kenduiwet, Legurdien, Logo, Lusui, Mdaa-mwitu, Mlala, Mpimbye, Mpojwa, Msambu, Mseseyu, Mubale, Muhoko, Muirosi, Mukor'or, Munyakungu, Mutharagwe, Mutimuiro, Nkinga, Nserere, Ochol, Ol-gurdien, Omuhoko, Omuyonjo

Distributed in: Angola, Congo, Ethiopia, Guinea, Kenya, Mozambique, Nigeria, Sudan, Tanzania, Uganda, Zambia, Zimbabwe (Africa)

Common uses: Agricultural implements, Boxes and crates, Cabinetmaking, Carvings, Flooring, Furniture, Golf club heads, Light construction, Mine timbers, Musical instruments, Poles, Posts, Sporting Goods, Textile equipment, Tool handles, Toys, Turnery

Tree size: Tree height is 10-20 m

Colors: the heart isWhite, White to creamand the sapwoodWhite, Yellow.The grain isWeak figure, the textureUniform

Natural durability: Susceptible to attack from termites (Isoptera), Very durable

Kiln Schedules: UK=C US=T3C2/T3C1 Fr=3

Kiln Drying Rate: Fairly rapid (11-17 days for boards under 32 mm, to 31-51 days for boards greater than 63 mm)

Drying Defects: Slight surface checking, Slight twist/warp

Ease of Drying: Moderately Difficult to Difficult

Tree Identification: Bole/stem form is straight

Blunting Effect: High to severe

Boring: Fairly difficult to very difficult

Carving: Fairly Difficult to Very Difficult

Cutting Resistance: Easy to saw

Gluing: Fairly Easy to Very Easy

Mortising: Fairly Difficult to Very Difficult

Moulding: Good finishing

Movement in Service: Good finishing

Nailing: Possible if prebored, Pre-Boring Recommended

Planing: Planes well, to a good finish

Resistance to Impregnation: Heartwood is resistant

Response to hand tools: Easy to machine

Routing recessing: Routing is easy

Sanding: Good sanding finish

Screwing: Fairly Difficult to Very Difficult, Pre-boring recommended; Turning: Fairly Difficult to Very Difficult

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

  • Numerical data Metric
  • Numerical data English
  • Strength properties
  • References
Item Green Dry Metric
Specific Gravity
Density 689 kg/m3
Bending Strength 654 1024 kg/cm2
Crushing Strength 386 581 kg/cm2
Hardness 580 kg
Impact Strength 162 cm
Shearing Strength 134 kg/cm2
Stiffness 97 112 1000 kg/cm2
Tangential Shrinkage %
Radial Shrinkage 6 %
Weight 673 544 kg/m3
Maximum Load cm-kg/cm3
Toughness cm-kg
Static Bending kg/cm2
Item Green Dry English
Bending Strength 9310 14566 psi
Density 43 lbs/ft3
Hardness 1279 lbs
Impact Strength 64 inches
Maximum Crushing Strength 5496 8275 psi
Shearing Strength 1918 psi
Stiffness 1393 1607 1000 psi
Weight 42 34 lbs/ft3
Radial Shrinkage 6 %
Tangential Shrinkage 9 %

Bending strength (MOR) = medium 0
Max. crushing strength = high 0
Modulus of Elasticity (stiffness) = low
Max. crushing strength = medium
Hardness (side grain) = soft
Shrinkage, Tangential = large
Shrinkage, Radial = large
Hardness (side grain) = medium
Shearing strength (parallel to grain) = medium
Toughness-Hammer drop (Impact Strength) = very high
Toughness-Hammer drop (Impact Strength) = high
Shearing strength (parallel to grain) = low
Density (dry weight) = 46-52 lbs/cu. ft.
Density (dry weight) = 38-45 lbs/cu. ft.
Shrinkage, Radial = fairly large
Shrinkage, Tangential = moderate
Shrinkage, Tangential = fairly large
Shrinkage, Radial = moderate
Modulus of Elasticity (stiffness) = medium
Density (dry weight) = 53-60 lbs/cu. ft
Density (dry weight) = 31-37 lbs/cu. ft.

Battiscombe, E., Dale, I.R.,1936,Trees and Shrubs of Kenya Colony,Govt. Printer NairobiBattiscombe, E.,1926,A Descriptive Catalogue of some of the Common Trees and Woody Plants of,Kenya Colony,Crown Agents for the Colonies LondonBois, 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. and Kitambi, G.,1960,The Air-drying Properties of some Tanganyika Timbers Technical Note No 23,Tanganyika Forest Department Utilisation Division Technical NoteBryce, J.M.,1967,Commercial Timbers of Tanzania,Tanzanian Forestry Division Util. Sec. MoshiDale, I.R., Greenway, P.J.,1961,Kenya Trees and Shrubs,Buchanans Kenya Estates Ltd. Nairobi Hatchards LondonEggeling, W.J.,1940,Indigenous Trees of Uganda,Govt. Printer Entebbe UgandaFlamwell, C.T.,1958,The Woodworking Properties of Diospyros abyssinica,Tanzania Forest Dept. Util. Sec. Moshi Tech. Note,No.11Goldsmith, B., Carter, D.T.,1981,The Indigenous Timbers of Zimbabwe,Forestry Commission, Zimbabwe Research Bulletin No.9Irvine, F.R.,1961,Woody Plants of Ghana,O.U.P. LondonKeay, R.W.J.,1964,Nigerian Trees Vol.2,Nigeria Federal Department of Forest Research, IbadanMurira, K.,1984,Natural Durability Tests of Tanzanian Timbers 1955 - 1982,Tanzania Forestry Research Institute, Timber Utilisation Research Centre,,Moshi.Patterson, D.N.,1963,The strength of Kenya timbers, their derivation and application,Kenya Forestry Department Research Bulletin,No.23Tack, 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 Department,1960,The Natural Durability of Local Timbers,Tanzanian Forest Dept. Tech. Note,No.14Tanzania Forest Division,1960,Diospyros abyssinica (Msambu,Tanzania Forest Div. Util. Sec. Moshi - Timbers of TanganyikaTanzania Forest Division,1966,Kiln Drying Schedules for Tanzania Timbers Technical Note no.38,Tanzania Forest Div. Util. Sec. MoshiTanzania Forest Division,1967,The Weights and Shrinkage of some Local Timbers,Tanzania Forest Div. Util. Sect. Technical Note,No.25Uganda Forest Department,1954,The Mechanical Properties of some Ugandan Timbers,Uganda Forest Department Timber Leaflet,No.1White, F.,1962,Forest Flora of Northern Rhodesia,O.U.P. LondonWimbush, S.H.,1950,Catalogue of Kenya Timbers,Govt. Printer Nairobi Kenya
*Come interpretare i dati (manleva su eventuali imprecisioni)