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Guarea (Guarea thompsonii)
Family: Meliaceae Common names: Akpaku, Avellano, Black guarea, Bo-in-dah, Bolon, Bosse, Busi, Cedar mahogany, Cedron, Close grained mahogany, Dark bosse, Diambi, Dikunze, Guano blanco, Guarea, Guarea bosse, Hapopeya, Kaffi, Koguibe, Kwabohoro, Lombe, Mietandabo, Mutigbanaga, Mutigbanaye, Nigerian cedar, Nigerian pearwood, Nuguata, Obabonekwi, Obobo, Obobo nekwi, Obobo-nekwi, Obobonekwi, Oboborukin, Ofe, Scented mahogany, Sidu, Sweet cedar, Teninini, Timbi, Tshidiamakeka, Ugbokpo Distributed in: Cameroon, Congo, Gabon, Ghana, Ivory Coast, Kenya, Liberia, Niger, Nigeria, Zaire (Africa) Distribution overview: This species is found in Cameroon, Congo, Cd'Ivoire, Gabon, Ghana, Liberia, Nigeria and Zaire. It is a shade tolerant species found in moist and evergreen forest hillsides. Common uses: Boat building (general), Boat building, Boxes and crates, Cabinetmaking, Canoes, Carvings, Chairs, Chests, Concealed parts (Furniture), Core Stock, Decorative plywood, Decorative veneer, Desks, Dining-room furniture, Dowell pins, Dowells, Drawer sides, Excelsior, Figured veneer, Fine furniture, Floor lamps, Flooring, Furniture , Furniture components, Furniture squares or stock, Furniture, Hatracks, Heavy construction, Joinery, Kitchen cabinets, Lifeboats, Light construction, Living-room suites, Millwork, Mine timbers, Office furniture, Paneling, Plain veneer, Plywood, Poles, Posts, Radio - stereo - TV cabinets, Rustic furniture, Shipbuilding, Stools, Structural plywood, Tables , Turnery, Utility furniture, Utility plywood, Vehicle parts, Veneer, Veneer: decorative, Wardrobes Product sources: The ITTO reports that the species is an important and regular source of timber for export. Environment profile: Status unsure as a result of insufficient information Tree size: Trunk diameter is 200-250 cm
Colors: the heart isYellow, Yellow to golden-yellow to orangeand the sapwoodWhite to yellow, Yellow.The grain isWavy, the textureVery fineand the lusterPronounced
Natural durability: Susceptible to insect attack, Very durable Odor: No specific smell or taste LightInduced Color Change: Darker
Kiln Schedules: UK=F US=T6D4/T3D3 Fr=6 Kiln Drying Rate: Naturally dries slowly
Drying Defects: Slight twist/warp, Splitting Ease of Drying: Variable results. Tree Identification: Bole/stem form is straight Comments: General finishing qualities are rated as good Narrow stock is apt to split in nailing. Splitting Blunting Effect: Moderate Boring: Fairly easy to very easy Carving: Very good results Cutting Resistance: Low cutting resistance Gluing: Poor to Very Poor Results Mortising: Fairly Easy to Very Easy Moulding: Fairly Easy to Very Easy Movement in Service: Fairly Easy to Very Easy Nailing: Pre-Boring Recommended, Very Good to Excellent Planing: Yields clean surfaces Resistance to Impregnation: Sapwood is permeable Response to hand tools: Responds Readily Routing recessing: Fairly Easy to Very Easy Sanding: Very Good to Excellent Results Veneering qualities: Suitable for slicing, Veneers easily Steam bending: Satisfactory
Screwing: Pre-boring recommended, Very Good to Excellent Results; Turning: Fairly Easy to Very Easy
Painting: Good; Polishing: Very Good to Excellent; Staining: Very Good to Excellent; Varnishing: Good;
Max. crushing strength = high 0 Bending strength (MOR) = medium 0 Bending strength (MOR) = high 0 Hardness (side grain) = soft 0 Modulus of Elasticity (stiffness) = low 1 Modulus of Elasticity (stiffness) = medium 0 Density (dry weight) = 38-45 lbs/cu. ft. 0 Shrinkage, Tangential = small Shrinkage, Volumetric = moderate Shrinkage, Tangential = moderate Shrinkage, Radial = very small Shrinkage, Radial = small Max. crushing strength = medium Shrinkage, Radial = fairly large Shearing strength (parallel to grain) = medium Shearing strength (parallel to grain) = low Toughness-Hammer drop (Impact Strength) = low Hardness (side grain) = medium Density (dry weight) = 31-37 lbs/cu. ft. Shrinkage, Volumetric = small Shrinkage, Tangential = very small Toughness (total work) = very low Toughness (total work) = low Shrinkage, Radial = moderate Modulus of Elasticity (stiffness) = very low Max. crushing strength = low Density (dry weight) = 46-52 lbs/cu. ft. Bending strength (MOR) = very high Bending strength (MOR) = low 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]Bois et Forets des Tropiques,1978,Bosse (Guarea cedrata, Guarea laurentii and Guarea thompsonii,Bois et Forets des Tropiques,No.177,pp35-49Bolza, E., Keating, W.G.,1972,African Timbers - the Properties, Uses and Characteristics of 700 Species,C.S.I.R.O. Div. of Building ResearchChudnoff, M.,1984,Tropical Timbers of the World,U.S.A. Department of Agriculture, Forest Service, Forest Products,Laboratory, Madison.Cooper, G.P., Record, S.J.,1931,The Evergreen Forests of Liberia,Yale School Forestry Bulletin,31,pp1-153Cox, H.A.,1939,A Handbook of Empire Timbers,Forest Products Research Laboratory, Princes RisboroughDesch, H.E.,1948,The Cedars,Wood 13(2) pp40-3Erfurth, T., Rusche, H.,1976,The Marketing of Tropical Wood A. Wood Species from African Moist Forests,F.A.O. Forestry DepartmentFarmer, R.H.,1972,Handbook of Hardwoods,HMSOForest Products Research Laboratory, U.K.,1945,A Handbook of Empire Timbers,Department of Scientific and Industrial Research Forest Products ResearchForests Products Research Laboratory, U.K.,1956,A Handbook of Hardwoods,Forest Products Research Laboratory, Princes Risborough, Department of,Science and Industrial Research, Building Research EstablishmentFouarge, J.,1950,Appropriation de Bois Congolais aux Besoins de la Metropole,I.N.E.A.C. Belgium Serie Technique,No.38Fouarge, J.,1953,Bois du Congo,I.N.E.A.C.France - 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. FranceFrance - Comite Nacional des Bois Coloniaux,1931,Etude Physique et Mecanique des Bois Coloniaux,Assoc. Colonies-Sciences & Comite National des Bios Coloniaux, Paris,,FranceHMSO.1972.Handbook of Hardwoods.2nd Edition.Revised by R.H. Farmer.Department of the Environment, Building Research Establishment, Princes Risborough Laboratory, Princes Risborough, Aylesbury, Buckinghamshire.Hughes, J.F.,1971,The Principal Timber Trees of Cameroon,Unpublished dataI.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 CuttingIrvine, F.R.,1961,Woody Plants of Ghana,O.U.P. LondonITTO.1986.Tropical Timber Atlas, Volume 1 - Africa.International Tropical Timber Organization (ITTO) and Centre Technique Forestier Tropical (CTFT, 45bis, Avenue de la Belle Gabrielle, Nogent-sur-Marne Cedex, France.Jay, B.A.,1968,Timbers of West Africa,TRADA, Red Booklet SeriesKeay, R.W.J.,1964,Nigerian Trees Vol.2,Nigeria Federal Department of Forest Research, IbadanKinloch, D., Miller, W.A.,1949,Gold Coast Timbers,Govt. Printer Gold CoastKryn, J.M., Forbes, E.W.,1959,The Woods of Liberia,U.S.A. Department of Agriculture,Forest Products Laboratory, Madison,,Report No. 2159Kukachka, B.F.,1970,Properties of Imported Tropical Woods,Forest Research Paper FPL 125Lavers, G. M.1966.The Strength Properties of Timbers. Forest Products Research Bulletin, No. 50.Ministry of Technology, Her Majesty's Stationery Office, London.Lavers, G.M.,1983,The Strength Properties of Timber (3rd ed. revised Moore G.L.,Forest Products Research Laboratory, Princes Risborough, Building Research,Establishment Report (formerly Bulletin No.50)Lebacq, L., Dechamps, R.,1967,Contribution a un Inventaire de Forets du Nord-kasai,Musee Royal de L'Afrique Centrale Belgium Annals Series 8 No.5Lincoln, W.A. 1986. World Woods in Color. Linden Publishing Co. Inc., Fresno, California.Pieters, A.,1977,Essences Forestieres du Zaire,R.U.G. Gent BelguimRendle, B.J.,1938,Commercial Mahoganies and Allied Timbers,Forest Products Research Laboratory, London Bulletin,No 18Rendle, B.J.,1969,World Timbers (3 Vols.,Ernest Benn Ltd. LondonSallenave, P.,1955,Proprietes Phyiques et Mecaniques des Bois Tropicaux de l'Union Francaise,C.T.F.TSpalt, H.A., Stern, W.L.,1956,Survey of African woods 1,Tropical Woods,115(105,pp 13-38Spalt, H.A., Stern, W.L.,1957,Survey of Africa Woods 3,Tropical Woods 16(107) pp92-128Takahashi, 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.Titmuss, F.H.,1965,Commercial Timbers of the World,Technical Press Ltd., London, 3rd editionUnwin, A.H.,1920,West African Forests and Forestry,T. Fisher Unwin Ltd. LondonWhitmore, T.C.,1973,Tree Flora of Malaya A Manual for Foresters Volume 2,Forest Department Ministry of Primary Industries MalaysiaWood, B., Calnan, D.,1976,Toxic Woods,British Journal of Dermat 94 Suppl. 13 |
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