DIANIA (Celtis tessmannii)

Nom commercial

Diania

Nom scientifique (avec auteur)

Celtis tessmannii Rendle

Famille

ULMACEAE

Noms communs (pays)

Zuwo (Nigeria); Ita (Nigeria); Dunki (Nigeria); lokonfi (Liberia); esa-kosua (Ghana); Esa-biri (Ghana); Lohonfé (Côte d`Ivoire); African celtis (United Kingdom); Diania (Zaire); Engo (Gabon); Ekembe bakaswa (Uganda); Kiliakamba (Angola); Celtis

DESCRIPTION DE L'ARBRE

Description botanique

The tree reaches a height of 40 m. The bole is cylindrical, but is often curved with alate buttresses.

Habitat naturel

Celtis tessmannii is locally frequent in the drier primary forests.

Répartition naturelle

It is found in western, central and parts of eastern 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). Occasionally white deposits in heartwood vessels. Tyloses thin walled. Non-vestured pits. Vessels per mm2 6 to 10 (medium) Occasionally axial parenchyma in marginal or in seemingly marginal bands. Paratracheal axial parenchyma scanty and/or vasicentric. Axial parenchyma aliform. Prismatic crystals in non-chambered axial parenchyma cells. 5 to 8 cells per parenchyma strand. 4 to 10 rays per mm (medium). Rays non-storied. Rays 1 to 4 seriate. Prismatic crystals in the ray cells. Body ray cells procumbent with mostly 2 to 4 rows of upright and/or square marginal cells (Kribs-II). Non-septate fibers. Fibers with simple to minutely bordered pits.

Vue macroscopique du bois (plan tangentiel)
Vue microscopique d'une section transversale du bois

Disponibilité

Statut CITES

Unrestricted

DESCRIPTION GÉNÉRALE DU BOIS

Odeur

Light and pleasant odor.

Teinte

The heartwood is white or light-yellow when freshly cut, turning grey-white with age, it is not clearly demarcated.

Index de Teinte (1 = Noir, 7 = Jaune clair)

Grain

Straight or sometimes interlocked. Usually interlocked grain is absent or very slight, without any effect on further processing operations.

Texture

Texture of this species is reported to vary from fine to medium.

Luster

Timber of this species is low in luster.

Durabilité naturelle

Not durable; important risks of decay attacks at any processing step, from logs up to final products. It must receive preservative treatment. Sensible to termites attack. Heartwood is sensible to Lyctus attacks.

Index de durabilité naturelle (1 = Très élevée, 7 = Très faible)

Tensions internes de croissance

No growth stresses are reported in this species.

Teneur en silice

Silica Content: It is reported to have silica. Contents over 0.05% may affect wood processing. Silica Value: 0.13

Résistance à l'imprégnation

Easy to treat with a full penetration of the preservative products using vacuum-pressure method.

PROPRIÉTÉS PHYSIQUES DU BOIS

Densité basale ou gravité spécifique (poids anhydre/vol. saturé) (g/cm³)

0.66

Densité sèche à l'air (poids et volume à 12%TH) (g/cm³)

0.74

Retrait tangentiel total (saturé à 0%TH) (%)

7.4

Retrait radial total (saturé à 0%TH) (%)

4.1

Calendrier de séchage en séchoir recommandé

FR-7

Ratio de stabilité dimensionnelle (% retrait tangentiel total/% retrait radial total)

1.8

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)

1156

Rigidité (module d'élasticité_ MOE) 12%TH (kgf/cm²)

171119

Résistance à la compression parallèle à la fibre 12%TH (kgf/cm²)

613

Résistance à la compression perpendiculaire à la fibre 12%TH (kgf/cm²)

Résistance au cisaillement (radial) 12%TH (kgf/cm²)

Dureté Janka (latérale) 12%TH (kgf)

680

Dureté Janka (extrémités) 12%TH (kgf)

770

OUVRABILITÉ

Sciage

It is easy to saw.

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

Easy; no particular problems.

Tournage

Perçage

Easy; no particular problems.

Mortaisage

Easy; no particular problems.

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)

EXTERIOR GENERAL, rails, crossarms, crossties, HOUSING GENERAL, beams, joists, boards, flooring, parquet, frames, steps, panelling, fittings, shutter boards, FURNITURE AND CABINETS, common furniture, PLYWOOD AND VENEER, faces, cores, common veneer, TURNING, ornaments, turned furniture, cutlery, lasts, PACKING, heavy packing, pallets, CONTAINERS, truck bodies, truck flooring, OTHER AND MUSICAL INSTRUMENTS, handicrafts, matches, moldings

EXTERIOR GENERAL

1 - Tabela de resultados de ensaios fisicos e mecanicos

Rampe

6 - Physical and mechanical properties of Eucalyptus deglupta Blume grown in Costa Rica

Crosses

7 - Maderas latinoamericanas. II, Quercus alata Q. costaricensis y Q. eugeniaefolia

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

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

Volets

20 - Prospect: The wood database

MEUBLES ET M. DE RANGEMENT

21 - Tropical timbers of the world. Part III-Southeast Asian and Oceanian Species.

Meubles ordinaire

23 - Handbook of Hardwoods

PANNEAUX ET PLACAGE

25 - Directory of Timber Trade Malaysia

Faces (de placage)

26 - Annual Review and Assessment of the World Timber Situation 1998-ITTO

âmes (de placage)

27 - Embassy of Brazil in Japan

Placage ordinaire

29 - Embassy of Ecuador in Japan

Tournage

30 - Embassy of Honduras in Japan

Ornements

31 - Embassy of Colombia in Japan

Ornements

32 - Embassy of Cote d`Ivoire in Japan

Manches de couverts

33 - Embassy of Gabon in Japan

Formes à chaussures

34 - Embassy of Indonesia in Japan

EMBALLAGE

45 - Recopilación y Análisis de Estudios Tecnológicos de Maderas Peruanas

Embal_lourd

47 - Arvores Brasileiras

Emballage, palettes

48 - The strength properties of timbers

Carros_camion

53 - Timbers of the New World

Wagons

54 - Bulletin of the Government Forest Experiment Station N.157: Identification of Tropical Woods

Artisanat

66 - Maderas latinoamericanas. VII. Caracteristicas anatomicas. propiedades fisicomecanicas, de secado, y tratabilidad de la madera juvenil de Cordia alliodora (Ruiz & Pav. Oken.)

Allumette

71 - Proprietes physiques et mecaniques des bois tropicaux, premier supplement

Moulures

79 - Padronização da Nomenclatura Comercial Brasileira das Madeiras Tropicais Amazônicas, Sugestão

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