Burkea Africana (Burkea)


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Scientific Name
Burkea africana

Trade Name
Burkea

Family Name
Leguminosae

Common Names
Aradibo, Atakpla, Avadibo, Bak’in, Bomni, Burkea, Bwamiri, Bwanzalenga, Cabilangan, Dagbongum, Esseresu opirimu, Gbagbongum, K’iryar dutse, Kapanga, Karya gatari, Kinkili, Kinkiri, Kirintanga, Kokobi, Kolo, Kombo, Kur’di, Kuru, Langengu, M’carati, Maccarati, Mak’arfo, Makarati, Make, Malawi, Mgando, Mkarati, Monoodo, Msangala, Mucarala, Mucarati, Mukalati, Mukarati, Musheshe, Mutundungu, Namijin k’irya, Pinimo, Pirimo, Pirimu, Sandering, Siri, Tachale, Tschesili, Tschingli, Umnondo, Wild seringa, Wilde sering, Wildesering

Regions of Distribution
Africa

Countries of Distribution  [VIEW MAP]
Angola, Botswana, Cameroon, Congo, Gabon, Ghana, Ivory Coast, Malawi, Mozambique, Namibia, Nigeria, South Africa, Sudan, Swaziland, Tanzania, Togo, Zaire, Zambia, Zimbabwe

Common Uses
Agricultural implements, Bedroom suites, Boat building (general), Boxes and crates, Building construction, Building materials, Cabin construction, Cabinetmaking, Charcoal, Construction, Crossties, Domestic flooring, Drawer sides, Excelsior, Factory construction, Flooring, Flooring: commercial heavy traffic, Fuelwood, Furniture , Furniture, Heavy construction, Joinery, Kitchen cabinets, Light construction, Living-room suites, Millwork, Mine timbers, Office furniture, Parquet flooring, Poles, Posts, Radio – stereo – TV cabinets, Railroad ties, Tool handles, Turnery, Vats, Vehicle parts

Environmental Profile

Very little threat to its natural environment.
Status unknown in many of its growth areas
Generally secure within its natural habitat
Data source is World Conservation Monitoring Center

Distribution Overview
Widely distributed in dry savanna forests from Nigeria southward to Transvaal.

Heartwood Color

Brown
Yellow to golden-yellow to orange
Reddish brown
Dark brown
Dark brown
Turn reddish brown upon exposure
Greyish brown

Sapwood Color

Pinkish
White to yellow
Color not distinct from heartwood

Grain

Interlocked
Figure
Distinct (figure)
Closed
Wavy
Stripe (figure)

 

Interlocked
Distinct and fine figure
Distinct figure
Wavy
Striped figure

Texture

Medium
Fine
Fine to medium
Coarse

Luster

Lustrous

Natural Growth Defects

Center is often decayed

Natural Durability

Very durable
Durable
Resistant to attack from termites (Isoptera)
Susceptible to attack from termites (Isoptera)
Untreated wood in contact with ground is very resistant to decay
Susceptible to attack from powder post (Lyctid & Bostrychid) beetles
Resistant to termite attack
Resistant to attack from powder post (Lyctid & Bostrychid) beetles
Pinworms (ambrosia beetles) are commonly present
Perishable
Moderately resistant to termite (Isoptera) attack
Moderately resistant to marine borer attack

Odor

No specific smell or taste

Light-Induced Color Change

Darker

Kiln Schedules

Kiln Drying Rate (in days) is rather slow
UK=B US=T2C2/T2C1 Fr=2
UK=C US=T3C2/T3C1 Fr=3
T2 – C2 (4/4) Us Schedule B (4/4) United Kingdom
Dry at a moderate speed

Drying Defects

Checking
Slight end splitting
Slight problem with splitting and distortion

Ease of Drying

Easy
Variable results.
Shrinkage Green to12% MC
Radial and tangential shrinkage from 1-2%
Dries slowly with moderate ease

Kiln Drying Rate

Very slow (>28 days for boards < 32 mm, to >84 days for boards >= 63 mm)

Tree Size

Trunk diameter is 100-150 cm
Tree height is 30-40 m
Tree height is 20-30 m
Trunk diameter is 200-250 cm

Comments
General finishing qualities are rated as good

Cutting Resistance

Cutting Resistance with dry wood is easy
Easy to saw

Gluing

Easy to glue
Glues well

Moulding

Poor moulding results

Movement in Service

Small
Holds shape after seasoning
Good stability after seasoning

Nailing

Difficult to nail
Pre-boring is recommended to avoid splitting
Possible if prebored

Planing

Difficult to plane
Planes to a poor finish
Torn grain is common

Resistance to Impregnation

Heartwood is extremely resistant
Sapwood is permeable
Heartwood is resistant

Resistance to Splitting

Poor

Response to Hand Tools

Easy to Work
Difficult to machine
Moderate working qualities
Easy to machine

Sanding

Good sanding finish

Screwing

Pre-boring suggested to avoid splitting

Turning

Good results
Easy to turn

Polishing

Satisfactory results
Good results

Staining

Staining properties are good

Strength Properties

Shrinkage, Tangential = very small
Shrinkage, Radial = very small
Shearing strength (parallel to grain) = medium
Max. crushing strength = medium
Density (dry weight) = 46-52 lbs/cu. ft.
Bending strength (MOR) = medium
Shrinkage, Radial = small
Max. crushing strength = high
Density (dry weight) = 61-67 lbs/cu.ft.
Shrinkage, Tangential = moderate
Modulus of Elasticity (stiffness) = very low
Hardness (side grain) = medium
Dnesity (dry wieght) = 53-60 lbs/cu. ft.
Bending strength (MOR) = low
Bending strength (MOR) = high
Very heavy
Toughness-Hammer drop (impact Strength) = high
Shrinkage, Volumetric = very small
Shrinkage, Volumetric = small
Shrinkage, Volumetric = moderate
Shrinkage, Tangential = small
Shearing strength (parallel to grain) = very high
Shearing strength (parallel to grain) = high
Modulus of Elasticity (stiffness) = medium
Modulus of Elasticity (stiffness) = low
Hardness (side grain) = very hard
Hardness (side grain) = soft
Density = high
Density (dry weight) = 67-75 lbs/cu. ft.
Bending strength (MOR) = very high

Numerical Data

Item Green Dry English
Bending Strength 10836 16513 psi
Density 53 lbs/ft3
Hardness 1813 lbs
Impact Strength 54 inches
Maximum Crushing Strength 5408 8171 psi
Shearing Strength 2475 psi
Stiffness 1264 1472 1000 psi
Specific Gravity 0.64
Weight 52 44 lbs/ft3
Radial Shrinkage 2 %
Tangential Shrinkage 5 %
Volumetric Shrinkage 8 %
Item Green Dry Metric
Bending Strength 761 1161 kg/cm2
Density 849 kg/m3
Hardness 822 kg
Impact Strength 137 cm
Maximum Crushing Strength 380 574 kg/cm2
Shearing Strength 174 kg/cm2
Stiffness 88 103 1000 kg/cm2
Specific Gravity 0.64
Weight 833 705 kg/m3
Radial Shrinkage 2 %
Tangential Shrinkage 5 %

References
Babajide, Lucas E., Shegun, Ajayi D.,1966,Stiffness and specific gravity related to other mechanical properties for,seven tropical timbers.,Nigeria Federal Department Forest Research, Ibadan, Report No.10

Banks, C.H. and J.P. Schoeman. 1963. Railway Sleeper and Crossing Timbers. Bulletin No. 41, Republic of South Africa. The Government Printer, Pretoria, South Africa.

Banks, C.H., Kromhout, C.P.,1966,Notes on the Timber of Burkea africana Hook with Particular Reference to,Material from S.W.Africa,Bosbou in Suid-Afrika,No.7, pp17-29

Banks, C.H., Schoeman, J.P., Otto, K.P.,1977,The Mechanical Properties of Timbers with particular reference to South,Africa,South African Forestry Research Institute Bulletin,(Ed.,Schoeman, J.P. 1973 & Otto K.P. 1976,No.48

Bolza, E., Keating, W.G.,1972,African Timbers – the Properties, Uses and Characteristics of 700 Species,C.S.I.R.O. Div. of Building Research

Bryce, J.M.,1967,Commercial Timbers of Tanzania,Tanzanian Forestry Division Util. Sec. Moshi

Chudnoff, M.,1984,Tropical Timbers of the World,U.S.A. Department of Agriculture, Forest Service, Forest Products,Laboratory, Madison.

Dalziel, J.M.,1937,The Useful Plants of West Tropical Africa,Crown Agents for the Colonies

Eggeling, W.J.,1940,Indigenous Trees of Uganda,Govt. Printer Entebbe Uganda

Erfurth, T., Rusche, H.,1976,The Marketing of Tropical Wood A. Wood Species from African Moist Forests,F.A.O. Forestry Department

Fanshawe, D.B.,1962,Fifty Common Trees of Northern Rhodesia,Natural Resources Board and Forestry Department, Ndola

Farmer, R.H.,1972,Handbook of Hardwoods,HMSO

Ferreirinha, M.P.,1955,Catalogo des Madeiras de Mocambique (pt 1,Min. do Ultramar Junta Invest. do Ultranar Memorias Serie Botanica, 2

Fortin, Y., Poliquin, J.,1976,Natural Durability and Preservation of 100 Tropical African Woods,International Development Research Centre, Canada

HMSO. 1981. Handbook of Hardwoods, 2nd Edition. Revised by R.H. Farmer. Department of the Environment, Building Research Establishment, Princes Risborough Laboratory, Princes Risborough, Aylesbury, Buckinghamshire.

Irvine, F.R.,1961,Woody Plants of Ghana,O.U.P. London

Jay, B.A.,1968,Timbers of West Africa,TRADA, Red Booklet Series

Keay, R.W.J. 1989. Trees of Nigeria. Revised Version of Nigerian Trees. Clarendon Press, Oxford.

Murira, K.,1984,Natural Durability Tests of Tanzanian Timbers 1955 – 1982,Tanzania Forestry Research Institute, Timber Utilisation Research Centre,,Moshi.

Organisation for European Economic Co-operation,1951,African Tropical Timber (Nomenclature, Description,OEEC

Pardy, A.A.,1952,Notes on Indigenous Trees and Shrubs of S. Rhodesia – Burkea africana,(Hook,Ministry of Agriculture and Lands S. Rhodesia Bulletin No.1651

Scott, J.D.,1950,Some Nigerian Timbers,Nigerian Forestry Department

Scott, M.H.,1935,Weights of South African Growth Timbers,South African Department of Agriculture and Forestry Bulletin,No.145,Forest Products Institute, Forestry Series No.1

Scott, 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]

Scott, M.H.,1953,Utilisation Notes on South African Timbers,South African Forestry Department Bulletin No.36

Storrs, A.E.G.,1979,Know your Trees – Some of the Common Trees found in Zambia,Zambia Forestry Department, Ndola

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. 7

Tanzania Forest Department,1960,The Natural Durability of Local Timbers,Tanzanian Forest Dept. Tech. Note,No.14

Tanzania Forest Department,1961,Timbers of Tanganyika – Brachystegia spiciformis,Tanzania Forest Dept. Util. Sec. Moshi – Timbers of Tanganyika

Tanzania Forest Division,1966,Kiln Drying Schedules for Tanzania Timbers Technical Note no.38,Tanzania Forest Div. Util. Sec. Moshi

Tanzania Forest Division,1967,Timbers of Tanganyika – Burkea africana,Tanzania Forest Div. Util. Sec. Moshi – Timbers of Tanganyika

WCMC. 1992. Conservation Status Listing – Trees and Timbers of the World. World Conservation Monitoring Center-Plants Programme, Cambridge, CB3 ODL, United Kingdom.

White, F.,1962,Forest Flora of Northern Rhodesia,O.U.P. London