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OKAN (Cylicodiscus gabunensis)
Nome comercial
Okan
Nome científico (autor)
Cylicodiscus gabunensis Harms
Família
LEGUMINOSAE
Nomes comuns
Denya (Ghana); Bouemon (Côte d`Ivoire); Edoum (Gabon); N'duma (Congo); Uzhi; Usi; Owese; Osung; Olosan; Olisan; Okain; Odenya; Odekowese; Ode owese; Muduma; Mobonran; Mbeli-deli; Lisan; Kendum; Inbeli-deli; Eyee; Emang; Ekam; Edoum; Doum; Djom; Denya; Bouemon; Boueman; Anyan; Aja-igi; Adum; Adada; N`duma (Congo); Oduma (Gabon); Edum (Gabon); African greenheart (Cameroon); Bokoka (Cameroon); Adoum (Cameroon); Okan (Nigeria); Adadua (Ghana); Benya (Ghana)
Nome científico sinônimo (autor
Piptadenia gabunensis (Harms) Roberty; Erythrophleum le-testui A. Chev.; Erythrophleum gabunense (Harms) Taub.; Cyrtoxiphus staudtii Harms
DESCRIÇÃO DA ÁRVORE
Descrição botânica
The tree reaches a height of more than 50 m. The bole is straight, cylindrical and clear to 26 m in length. The trunk diameter attains from 100 to 130 cm, but it may reach over 300 cm above the buttresses.
Habitat natural
Cylicodiscus gabunensis occurs in rain forests.
Distribuição natural
West Africa, from Sierra Leone to Gabon.
IDENTIFICAÇÃO DA MADEIRA
Descrição anatômica da madeira (macro e micro)
Wood diffuse porous. Occasionally vessels exclusively solitary (over 90%). Tangential diameter of vessel lumina 200 micras or more (large). Brown-colored deposits in heartwood vessels. Vestured pits. Vessels per mm2 less than 6 (rare). Vessel-ray pits similar t Axial parenchyma lozenge-aliform. Axial parenchyma aliform. Prismatic crystals in chambered axial parenchyma cells and/or in fibers. 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.
DISPONIBILIDADE
Situação CITES sobre a proteção
Unrestricted
DESCRIÇÃO GERAL DA MADEIRA
Cor
The sapwood is greyish pink, it has a thickness of 5 cm. The heartwood is yellow-brown to golden brown, with greenish tinge, it is clearly demarcated. The silver figure is fine.
Indice de cor
2
Grã
Straight or slightly interlocked, sometimes with an influence on further processing operations.
Veios ou desenhos na superfície
The texture is typically medium to coarse.
Brilho
Luster is usually low.
DURABILIDADE NATURAL
Very durable to decay; without preservative treatment. This species is especially suited for all the uses with risks of permanent or long-lasting humidification. Resistant to termites attack. Heartwood is resistant to Lyctus attacks.
Indice de durabilidade natural
1
Tensões internas do crescimento
No growth stresses are reported in this species.
Conteúdo de sílica
Silica Content: This timber is reported to have a negligible silica content. Silica contents over 0.05% may affect wood processing. Silica Value: 0
Tratamento preservativo
Difficult to treat with only a low penetration of the preservative products.
PROPRIEDADES FÍSICAS DA MADEIRA
Densidade básica (Peso seco/Volume saturado) (g/cm³)
0.80
Densidade seca ao ar 12% (g/cm³)
0.91
Contração Tangencial Total (Saturado até peso seco) (%)
7.9
Contração Radial Total (Saturado até peso seco) (%)
5.9
Defeitos causados pela secagem
Ease of Drying: Air drying is rated as good.
Programa de secagem recomendável
FR-12
Estabilidade dimensional (Contração Tangencial Total %/Contração Radial Total %)
1.3
Programa de secagem detalhado
http://www.tropicaltimber.info/wp-content/uploads/2015/09/KD_French.pdf
PROPRIEDADES QUÍMICAS DA MADEIRA
PROPRIEDADES MECÂNICAS DA MADEIRA
Resistência a flexão a 12% (Módulo de ruptura) (kgf/cm²)
1367
Flexão Estática a 12% (Módulo de elasticidade) (kgf/cm²)
226919
Resistência a compressão paralela as fibras a 12% (kgf/cm²)
835
Resistência a compressão perpendicular as fibras a 12% (kgf/cm²)
123
Cisalhamento radial a 12% (kgf/cm²)
105
Dureza Janka a 12% (perpendicular) (kgf)
1047
Dureza Janka a 12% (paralela) (kgf)
1085
TRABALHABILIDADE
Serrar ou Cortar
Sawing of this species requires powerful equipment.
Desdobro da tora em torno para lâminas
Not suitable for veneering.
Desdobro da tora em faqueadeira para lâminas
Not suitable for veneering.
Desgaste de ferramentas
Moderate blunting effect; stellited blades for sawing and carbide tools for machining are advised.
Aspectos do processamento em máquinas
It needs powerful tools for processing. Possible difficulties caused by interlocked grain are reported.
Aplainamento
Rather difficult; special tools are needed.
Aplicação para molduras
Moderately easy; tools must be cautiously sharpened.
Torneamento
30
Furação
Moderately easy; tools must be cautiously sharpened.
Fresagem_ranhura_canais
Moderately easy; tools must be cautiously sharpened.
Comportamento na aplicação de pregos
Pre-boring is necessary.
Colagem
Difficult to glue because of high density.
Lixamento
Easy to perform; it gives good results.
Operação de lustre da superfície (brilho)
Needs pre-coating.
Trabalhabilidade com ferramentas manuais
Working with hand tools is difficult.
USOS FINAIS RELATADOS
USOS FINAIS (RESUMO)
HOUSING GENERAL, beams, joists, boards, flooring, parquet, frames, FURNITURE AND CABINETS, luxury furniture, cabinets, TURNING, ornaments, turned furniture, cutlery, lasts, CONTAINERS, truck bodies, truck flooring, OTHER AND MUSICAL INSTRUMENTS, handicrafts
CASAS
- 10 - Silica in Timbers
Vigas
- 11 - Prospect: The wood database
Vigotas
- 12 - Tropical timbers of the world. Part I-Tropical American Species
Tábuas
- 13 - Dry kiln schedules for commercial woods. Temperate and tropical. Section III. Latin American (Mexico, Central, and South America) Woods–Conventional Temperatures
Pisos
- 14 - Handbook of Hardwoods
Parquets
- 15 - Empire Timbers
Marcos de portas
- 16 - Woods of the World
MÓVEIS GABINETES
- 21 - Tropical timbers of the world. Part III-Southeast Asian and Oceanian Species.
Móveis finos
- 22 - Dry kiln schedules for commercial woods. Temperate and tropical. Section IV-Asian and Oceanian Woods
Gabinetes
- 24 - Empire Timbers
Torneamento
- 30 - Embassy of Honduras in Japan
Artigos torneados
- 31 - Embassy of Colombia in Japan
Artigos torneados
- 32 - Embassy of Cote d`Ivoire in Japan
Cabo de faca
- 33 - Embassy of Gabon in Japan
Formas de sapateiro
- 34 - Embassy of Indonesia in Japan
Carroceria de caminhão
- 53 - Timbers of the New World
Pisos para assoalho de trem
- 54 - Bulletin of the Government Forest Experiment Station N.157: Identification of Tropical Woods
Artesanato
- 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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