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NIANGON (Tarrietia densiflora)
Nom commercial
Niangon
Nom scientifique (avec auteur)
Tarrietia densiflora Aubrev. et Normand
Famille
STERCULIACEAE
Noms communs (pays)
Yawi (Sierra Leone); Whismore (Liberia); Ogoue (Gabon); Nyankom (Ghana); Niangon (Côte d`Ivoire); Whosmore (Liberia); Yawe (Sierra Leone); De-orh (Liberia); Ogoue (Cameroon)
Synonymes du nom scientifique (avec auteurs)
Tarrietia utilis Sprague var. densiflora Pellegr.; Heritiera densiflora (Pellegr.) Kosterm.
DESCRIPTION DE L'ARBRE
Description botanique
The tree reaches a height of 32 to 43 m. The bole is straight and clear to 20 m in length, buttressed and sometimes irregular or stilt rooted in swampy areas. The trunk diameter attains 70 to 100 cm.
Habitat naturel
Tarrietia densiflora occurs in low-lands, as well as in hilly areas.
Répartition naturelle
West Africa, especially in Cameroon and Gabon.
IDENTIFICATION DU BOIS
Description anatomique du bois
Wood diffuse porous. Occasionally vessels exclusively solitary (over 90%). Tangential diameter of vessel lumina 200 micras or more (large). Non-vestured pits. Vessels per mm2 less than 6 (rare). Simple perforation plates. Vessel-ray pits similar to intervessel Apotracheal axial parenchyma diffuse and/or diffuse in aggregates. Paratracheal axial parenchyma scanty and/or vasicentric. Axial parenchyma storied. Non-crystals in axial parenchyma cells. 3 to 4 cells per parenchyma strand. Rays less than 4 per mm (rare). Rays non-storied. Larger rays more than 4 seriate. Occasionally prismatic crystals in the ray cells. Heterogeneous rays and/or multiseriate heterogeneous rays. Non-septate fibers. Fibers with simple to minutely bordered pits.
Disponibilité
Statut CITES
Unrestricted
DESCRIPTION GÉNÉRALE DU BOIS
Teinte
The sapwood is white to greyish white, it has a thickness of 15 cm. The heartwood is pink brown to red brown, it is clearly demarcated. The silver figure is large.
Index de Teinte (1 = Noir, 7 = Jaune clair)
5
Grain
The grain is slightly but systematically interlocked; special care is needed when drying because of frequent risks of distortion.
Texture
The wood is mostly medium in texture.
Luster
The wood surface is described as high in luster.
Durabilité naturelle
Moderately durable to decay. Without preservative treatment, this species can be used only under risk of occasional re-humidification. It is not suited for uses with risks of permanent or long-lasting humidification. Moderately resistant to termites attack
Index de durabilité naturelle (1 = Très élevée, 7 = Très faible)
3
Tensions internes de croissance
Residual stresses are reported to be absent.
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)
0.68
Densité sèche à l'air (poids et volume à 12%TH) (g/cm³)
0.77
Retrait tangentiel total (saturé à 0%TH) (%)
9.5
Retrait radial total (saturé à 0%TH) (%)
4.7
Défauts dus au séchage
Ease of Drying: Drying is moderately difficult to difficult; special care is systematically needed. Drying Defects: No particular risks of drying defects, subject to normal drying conditions. Kiln Schedules: The kiln schedule has been tested.
Calendrier de séchage en séchoir recommandé
FR-4
Ratio de stabilité dimensionnelle (% retrait tangentiel total/% retrait radial total)
2.0
Calendrier de séchage en séchoir
http://www.tropicaltimber.info/wp-content/uploads/2015/09/KD_French.pdf
PROPRIÉTÉS CHIMIQUES DU BOIS
PROPRIÉTÉS MÉCANIQUES DU BOIS
Résistance à la flexion (module de rupture_MOR) 12%TH (kgf/cm²)
1120
Rigidité (module d'élasticité_ MOE) 12%TH (kgf/cm²)
157481
Résistance à la compression parallèle à la fibre 12%TH (kgf/cm²)
584
Résistance à la compression perpendiculaire à la fibre 12%TH (kgf/cm²)
76
Résistance au cisaillement (radial) 12%TH (kgf/cm²)
84
Dureté Janka (latérale) 12%TH (kgf)
729
Dureté Janka (extrémités) 12%TH (kgf)
813
OUVRABILITÉ
Sciage
Sawing of this species is easy to moderately easy.
Coupe de placage de déroulage
Suitable for slicing, also suitable for peeling if treated.
Placage tranche
Suitable for slicing, also suitable for peeling if treated.
Effet d'émoussement
Slight blunting effect; ordinary tools can be used for sawing and machining.
Usinage
Machining of this species is reportedly easy.
Rabotage
Moderately easy; tools must be cautiously sharpened.
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
Glues well if basic gluing technical rules are followed.
Ponçage
Easy to perform; it gives good results.
Polissage
Can be polished without surface preparation.
Cintrage à la vapeur
This species can be used for steam bending.
Compatibilité avec outils manuels
No particular problems.
UTILISATIONS
UTILISATIONS FINALES (RÉSUMÉ)
HOUSING GENERAL, beams, joists, boards, flooring, parquet, frames, steps, panelling, fittings, FURNITURE AND CABINETS, luxury furniture, cabinets, PLYWOOD AND VENEER, faces, Decorative veneer, TURNING, ornaments, turned furniture, NAVAL CONSTRUCTION, boat deck, port storage, OTHER AND MUSICAL INSTRUMENTS, shingle, moldings
MEUBLES ET M. DE RANGEMENT
- 10 - Silica in Timbers
Pouters
- 11 - Prospect: The wood database
Solives
- 12 - Tropical timbers of the world. Part I-Tropical American Species
Planches
- 13 - Dry kiln schedules for commercial woods. Temperate and tropical. Section III. Latin American (Mexico, Central, and South America) Woods–Conventional Temperatures
Planchers
- 14 - Handbook of Hardwoods
Parquets
- 15 - Empire Timbers
Cadres
- 16 - Woods of the World
Marches
- 17 - Tree Conservation Database
Panneaux
- 18 - W3TROPICOS Missouri Botanical Garden
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.
Meubles luxe
- 22 - Dry kiln schedules for commercial woods. Temperate and tropical. Section IV-Asian and Oceanian Woods
Armoires
- 24 - Empire Timbers
PANNEAUX ET PLACAGE
- 25 - Directory of Timber Trade Malaysia
Faces (de placage)
- 26 - Annual Review and Assessment of the World Timber Situation 1998-ITTO
Placage tranché
- 28 - Ministry of Agriculture, Fisheries & Forest of Fiji
Tournage
- 30 - Embassy of Honduras in Japan
Ornements
- 31 - Embassy of Colombia in Japan
Ornements
- 32 - Embassy of Cote d`Ivoire in Japan
CONSTRUCTION NAVALE
- 55 - Tropical Timber Atlas of Latin America
Navires_ponts
- 59 - Programa Nacional de uso Sostenible de los Bosques e Incremento a las Exportaciones.
Port entreposage
- 62 - Estudio Tecnológico de Maderas del Perú (Zona Pucallpa) Vol I
Shingles
- 77 - Amazonian Timbers, Characteristics and Utilization Volume I; Tapajós National Forest
Moulures
- 79 - Padronização da Nomenclatura Comercial Brasileira das Madeiras Tropicais Amazônicas, Sugestão
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