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MUKARATI (Burkea africana)
Nom commercial
Mukarati
Nom scientifique (avec auteur)
Burkea africana Hook.
Famille
LEGUMINOSAE
Noms communs (pays)
Combo kourou (Guinea); Mukarati (Uganda); Burkea (Uganda); Mkarati (Tanzania); Burkea (Tanzania); Burkea (Kenya); Burkea (Ethiopia); Mucarala (Mozambique)
DESCRIPTION DE L'ARBRE
Description botanique
The tree reaches 15 to 20 m in height, with a bole length of 5 to 6 m. The trunk diameter is between 30 to 60 cm.
Habitat naturel
Burkea africana is widely distributed in dry savanna forests.
Répartition naturelle
From Nigeria southward to south Africa.
IDENTIFICATION DU BOIS
Description anatomique du bois
Wood diffuse porous. Occasionally vessels exclusively solitary (over 90%). Tangential diameter of vessel lumina 100 to 150 micras (small). Brown-colored deposits in heartwood vessels. Vestured pits. Vessels per mm2 6 to 10 (medium). Simple perforation plates. Ve Axial parenchyma in marginal or in seemingly marginal bands. Paratracheal axial parenchyma scanty and/or vasicentric. Axial parenchyma lozenge-aliform. Axial parenchyma confluent. Non-crystals in axial parenchyma cells. 3 to 4 cells per parenchyma strand. 4 to 10 rays per mm (medium). Rays non-storied. Rays 1 to 4 seriate. Homogeneous rays and/or sub-homogeneous rays (all ray cells procumbent). Non-septate fibers. Fibers with simple to minutely bordered pits.
Disponibilité
Statut CITES
Unrestricted
DESCRIPTION GÉNÉRALE DU BOIS
Teinte
The sapwood is white with yellow or pink tones, it has a thickness of 2.5 cm. The heartwood is brown with green or grey tinges, turning dark brown or red brown on exposure, it is not clearly demarcated.
Grain
Straight or slightly interlocked, sometimes with an influence on further processing operations.
Texture
The wood is mostly fine in texture.
Luster
The wood surface is low in luster.
Durabilité naturelle
Durable to decay; this species can be utilized without preservative treatment for exterior joinery or similar uses. Resistant to termites attack. Heartwood is resistant to Lyctus attacks.
Index de durabilité naturelle (1 = Très élevée, 7 = Très faible)
1
Résistance à l'imprégnation
Nearly impossible to treat with a too much low penetration of the preservative substances.
PROPRIÉTÉS PHYSIQUES DU BOIS
Densité basale ou gravité spécifique (poids anhydre/vol. saturé) (g/cm³)
0.75
Densité sèche à l'air (poids et volume à 12%TH) (g/cm³)
0.85
Défauts dus au séchage
Ease of Drying: It was noted that the wood has no difficulties in drying. The rate of shrinkage from green to oven dry is 2.9% radial and 6.4% tangential. Drying Defects: It can stand very rapid drying without suffering any appreciable damage. But end-splitting may occurs when green wood is kiln dried too fast. The wood color is said to improve by the kiln-seasoned. And once it's dry, the wood is exceptional stable in serv Kiln Schedules: Pre-drying is recommended. The temperature during kiln drying should be 43-71oC and the corresponding relative humidity should decrease from 84% to 38%.
PROPRIÉTÉS CHIMIQUES DU BOIS
PROPRIÉTÉS MÉCANIQUES DU BOIS
Résistance à la flexion (module de rupture_MOR) 12%TH (kgf/cm²)
1365
Rigidité (module d'élasticité_ MOE) 12%TH (kgf/cm²)
166097
Résistance à la compression parallèle à la fibre 12%TH (kgf/cm²)
723
Résistance au cisaillement (radial) 12%TH (kgf/cm²)
170
OUVRABILITÉ
Sciage
Sawing of this species requires powerful equipment.
Coupe de placage de déroulage
Not suitable for veneering.
Placage tranche
Not suitable for veneering.
Effet d'émoussement
Moderate blunting effect; stellited blades for sawing and carbide tools for machining are advised.
Usinage
It needs powerful tools for processing. Possible difficulties caused by interlocked grain are reported.
Rabotage
Rather difficult; special tools are needed.
Moulurage
Moderately easy; tools must be cautiously sharpened.
Tournage
30
Perçage
Moderately easy; tools must be cautiously sharpened.
Mortaisage
Moderately easy; tools must be cautiously sharpened.
Clouage
Pre-boring is necessary.
Collage
Difficult to glue because of high density.
Ponçage
Particular care is needed to avoid woolly aspect of the surface.
Polissage
Can be polished without surface preparation.
Compatibilité avec outils manuels
Working with hand tools is difficult.
UTILISATIONS
UTILISATIONS FINALES (RÉSUMÉ)
EXTERIOR GENERAL, poles, stakes posts, crossties, HOUSING GENERAL, parquet, fittings, FURNITURE AND CABINETS, cabinets, TURNING, SPORTS, TOOLS, tool handles, agricultural tools, NAVAL CONSTRUCTION, boats, OTHER AND MUSICAL INSTRUMENTS, handicrafts
EXTERIOR GENERAL
- 1 - Tabela de resultados de ensaios fisicos e mecanicos
Poteaux
- 3 - Estudo dendrologico e determinacao das caracteristicas fisicas e mecanicas do genipapo (Genipa americana)
Piquets
- 5 - Propriedades fisicas e mecanicas da madeira e do contraplacado de Pinus elliottii
Traverses de chemin de fer
- 8 - Maderas latinoamericas. III, Podocarpus standleyi ,Podocarpus oleifolius, Drims granadensis, Magnolia poasana y Didymopanax pittieri
MEUBLES ET M. DE RANGEMENT
- 10 - Silica in Timbers
Parquets
- 15 - Empire Timbers
Accessoires en bois
- 19 - Silica in Timbers
MEUBLES ET M. DE RANGEMENT
- 21 - Tropical timbers of the world. Part III-Southeast Asian and Oceanian Species.
Armoires
- 24 - Empire Timbers
Tournage
- 30 - Embassy of Honduras in Japan
SPORTS
- 38 - Annual Review and Assessment of the World Timber Situation 1998-ITTO
OUTILS
- 42 - Utilización Industrial de Nuevas Especies Forestales en el Perú.
Outils_manches
- 43 - Maderas de Bolivia (Características y Usos de 55 Maderas Tropicales)
Outils_agric
- 44 - Atlas of Peruvian Woods
CONSTRUCTION NAVALE
- 55 - Tropical Timber Atlas of Latin America
Navires
- 56 - Manual de Identificación de Especies Forestales de la Subregión Andina.
Artisanat
- 66 - Maderas latinoamericanas. VII. Caracteristicas anatomicas. propiedades fisicomecanicas, de secado, y tratabilidad de la madera juvenil de Cordia alliodora (Ruiz & Pav. Oken.)
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