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Rhodesian teak
Rhodesian teak (Baikiaea plurijuga)

Family: Leguminosae

Common names: Gusi, Igusi, Ikusi, Mkusi, Mukushi, Mukusi, Redwood, Rhodesian redwood, Rhodesian teak, Umgusi, Umgusu, Umguzi, Umguzu, Umkuswi, Umpapa, Zambesi redwood, Zambesian redwood

Distributed in: Angola, Botswana, Namibia, South Africa, Zambia, Zimbabwe (Africa)

Distribution overview: This species occurs in Angola, Botswana, Namibia, Zambia and Zimbabwe. It is confined to lowland tropical forest on the Kalahari sands. Baikiaea plurijuga is the dominant component of the Baikiaea forest canopy. Baikiaea forest is the most extensive deciduous forest on the Kalahari Sand in the south of the Upper Zambezi basin and B. plurijuga is essentially limited to this area. In Zimbabwe, B. plurijuga is found in higher areas of thicket on Kalahari sands of the Lupane and Nkayi districts and in higher areas of woodland thicket on colluvium in the Binga district.

Common uses: Boat building (general), Boat building: decking, Cabinetmaking, Carvings, Domestic flooring, Flooring, Flooring: commercial heavy traffic, Flooring: industrial heavy traffic, Food containers, Furniture, Heavy construction, Light construction, Mine timbers, Moldings, Paneling, Parquet flooring, Plywood, Posts, Railroad ties, Sub-flooring, Tool handles, Toys, Turnery, Vats, Vehicle parts, Veneer, Veneer: decorative, Wheel spokes, Wheels

Product sources: The ITTO reports that an important source of timber. The timber is exported in low quantities.Tatajuba is exported from Brazil into Italy, Germany, Holland, and England.

Environment profile: Generally widespread, secure, and abundant within most of its range

Colors: the heart isReddish brown, Reddish-Brown, sometimes marked with irregular dark brown or black lines or flecks and the sapwoodWhite to yellow, Yellow.The grain isWeak figure, the textureMediumand the lusterSlightly lustrous

Natural durability: Susceptible to attack from powder post (Lyctid & Bostrychid) beetles, Very durable

Odor: No specific smell or taste

Kiln Schedules: UK=D US=T3D2/T3C1

Drying Defects: Slight surface checking, Slight twist/warp

Ease of Drying: Easy to dry

Comments: General finishing qualities are rated as good Under moist conditions, tannin may react with iron and iron compounds that come in contact with the wood to cause discoloration

Blunting Effect: Severe blunting effect on cutting tools due to high silica content

Boring: Prone to charring in many machining operations

Cutting Resistance: Specially-Tipped saws are recommended

Gluing: Fairly Easy to Very Easy

Moulding: Good finishing

Movement in Service: Good finishing

Nailing: Possible if prebored, Very poor nailing properties

Planing: Tendency for wood to ride on cutters if material is not held firmly

Resistance to Impregnation: Sapwood is moderately resistant

Response to hand tools: Difficult to machine

Veneering qualities: Diifficult to veneer, No drying degrade. Dries flat without splitting

Steam bending: Occasional small knots and a tendency for the wood to buckle make it unsuitable for steam bending

Screwing: Screwing yields good results ; Turning: Good results

Painting: Takes paint well ; Polishing: Good; Staining: Stains well; Varnishing: Good varnishing properties ;

  • Numerical data Metric
  • Numerical data English
  • Strength properties
  • References
Item Green Dry Metric
Specific Gravity 0,64
Density 897 kg/m3
Bending Strength 519 844 kg/cm2
Crushing Strength 450 672 kg/cm2
Hardness 1358 kg
Impact Strength cm
Shearing Strength 155 kg/cm2
Stiffness 80 91 1000 kg/cm2
Tangential Shrinkage 4 %
Radial Shrinkage 2 %
Weight 881 881 kg/m3
Maximum Load cm-kg/cm3
Toughness cm-kg
Static Bending kg/cm2
Item Green Dry English
Bending Strength 7391 12008 psi
Density 56 lbs/ft3
Hardness 2995 lbs
Maximum Crushing Strength 6401 9572 psi
Shearing Strength 2205 psi
Stiffness 1147 1300 1000 psi
Specific Gravity 0.64
Weight 55 55 lbs/ft3
Radial Shrinkage 2 %
Tangential Shrinkage 4 %
Volumetric Shrinkage 8 %

Density (dry weight) = 53-60 lbs/cu. ft 0
Max. crushing strength = high
Density (dry weight) = 61-67 lbs/cu. ft
Shrinkage, Radial = very small
Shearing strength (parallel to grain) = medium
Modulus of Elasticity (stiffness) = very low
Hardness (side grain) = very hard
Shrinkage, Tangential = very small
Bending strength (MOR) = low
Density (dry weight) = 46-52 lbs/cu. ft.
Bending strength (MOR) = medium
Very high density
Very heavy
Very hard
Shrinkage, Tangential = small
Modulus of Elasticity (stiffness) = medium
Max. crushing strength = very high
Max. crushing strength = medium
Bending strength (MOR) = high
The bending strength of air-dried wood of the species is similar to that of Teak, which is considered to be strong. It is stronger than Hard maple, White oak, or Teak. may require special tools to process

Arkwright, P.,1960,Know your Timber No.70 Baikiea plurijuga,Woodworking Industry,17(3,p153Banks, 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., 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.48Banks, C.H.,1954,The Mechanical Properties of Timbers with Particular Reference to those,grown in the Union of South Africa,Journal of the South African Forestry Association,No. 24 pp.44-65,[South,African Forestry Journal]Banks, C.H.,1970,The Durability of South African Wood and Wood Base Building Materials,South African Forestry Journal,No.75Bolza, E., Keating, W.G.,1972,African Timbers - the Properties, Uses and Characteristics of 700 Species,C.S.I.R.O. Div. of Building ResearchBrown, W.H.,1978,Timbers of the World No.1 Africa,TRADA, Red Booklet SeriesChalk, L., et al,1932,Some East African Coniferae and Leguminosae,Forest Trees and Timbers of the British Empire,Part 1Chudnoff, M.,1984,Tropical Timbers of the World,U.S.A. Department of Agriculture, Forest Service, Forest Products,Laboratory, Madison.Clifford, N.,1953,Commercial Hardwoods - Their Characteristics Identification and,Utilization,Sir Isaac Pitman & Sons Ltd. LondonCox, H.A.,1939,A Handbook of Empire Timbers,Forest Products Research Laboratory, Princes RisboroughDesch, H.E.,1947,The Teaks,Wood,12(11,pp324-5Desch, H.E.,1951,Manual of Commercial Timbers,The Author Crockham Hill, Kent,Vol.1Fanshawe, D.B.,1962,Fifty Common Trees of Northern Rhodesia,Natural Resources Board and Forestry Department, NdolaFarmer, R.H.,1972,Handbook of Hardwoods,HMSOForest Products Research Laboratory, U.K.,1954,Hardwoods for Industrial Flooring,Forest Products Research Laboratory, Princes Risborough, Leaflet, No.48Forest Products Research Laboratory, U.K.,1955,Kiln-Drying Schedules,Forest Products Research Laboratory, Princes Risborough, Department of,Science and Industrial Research, Building Research Establishment Leaflet,No.42Forest Products Research Laboratory, U.K.,1969,The Movement of Timbers,Forest Products Research Laboratory, Princes Risborough Technical Note,No.38Fortin, Y., Poliquin, J.,1976,Natural Durability and Preservation of 100 Tropical African Woods,International Development Research Centre, CanadaGoldsmith, B., Carter, D.T.,1981,The Indigenous Timbers of Zimbabwe,Forestry Commission, Zimbabwe Research Bulletin No.9HMSO.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.I.U.F.R.O.,1973,Veneer Species of the World,Assembled at F.P.L. Madison on behalf of I.U.F.R.O. Working Party on,Slicing and Veneer CuttingKloot, N. H. and E. Bolza.1961.Properties of Timbers Imported into Australia.Technological Paper No. 12.Division of Forest Products, Commonwealth Scientific and Industrial Organization, Melbourne, Australia.Kloot, N.H., Bolza, E.,1961,Properties of Timbers Imported into Australia,C.S.I.R.O. Forest Products Division Technological Paper,No.12Kribs, D.A.,1950,Commercial and Foreign Woods on the American Market (a manual to their,structure, identification, uses and distribution,U.S.A. Penn. State College, Tropical Woods LaboratoryMartin, J.D.,1940,The Baikiaea Forests of Northern Rhodesia,Empire Forestry Journal,19,pp8-18Pardy, A.A.,1952,Notes on Indigenous Trees and Shrubs of S. Rhodesia - Baikiaea plurijuga,(Harms,Ministry of Agriculture and Lands S.Rhodesia Bulletin,No.1605Patterson, D.,1988,Commercial Timbers of the World, 5th Edition,Gower Technical PressRendle, B.J.,1969,World Timbers (3 Vols.,Ernest Benn Ltd. LondonScott, 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.1Scott, 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]Simpson, W.T. and J.A. Sagoe. 1991. Relative Drying Times of 650 Tropical Woods : Estimation by Green Moisture Content, Specific Gravity, and Green Weight Density.United States Department of Agriculture (USDA, Forest Service, General Technical Report FPL-GTR-71, Forest Products Laboratory, Madison, Wisconsin.South African Lumber Millers Assoc.,1969,Notes on some Commercially Available Hardwoods,S.A.L.M.A. Timber Info. Centre Timber Technical Guide,No.1Spalt, H.A., Stern, W.L.,1956,Survey of Africa Woods 2,Tropical Woods 16(106) pp65-97Spalt, H.A., Stern, W.L.,1957,Survey of Africa Woods 3,Tropical Woods 16(107) pp92-128Storrs, A.E.G.,1979,Know your Trees - Some of the Common Trees found in Zambia,Zambia Forestry Department, NdolaTakahashi, 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 Development Association Ltd.,1955,World Timbers (3 Vols.,Timber Development Association Ltd.Timber Development Association,1948,Some New Timbers and Their Uses No. 34,Timber Development Association Limited, London [TRADA]Timber Information Assoc. Ltd.,1947,Notes on East African Timbers,TRADA, Timber Information, No.28WCMC.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. LondonZambia - N.Rhodesia Chamber of Mine,1942,Native Timber,Northern Rhodesia Chamber of Mines
*Come interpretare i dati (manleva su eventuali imprecisioni)