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OKOUMé (Aucoumea klaineana)
Nome comercial
Okoumé
Nome científico (autor)
Aucoumea klaineana Pierre
Família
BURSERACEAE
Nomes comuns
Okume (Equatorial Guinea); N'goumi (Equatorial Guinea); N'kumi (Congo); Zouga; Uume; Ongoumi; Ojoume; Mofoumou; M`goumi; Koumi; Gaboon wood; Gaboon mahogany; Cape Lomez mahogany; Bengouma; Acoume; N`koumi (Gabon); Moukoumi (Gabon); Gaboon (United Kingdom); N`kumi (Congo); Angouma (Gabon); Okoume (Gabon); N`goumi (Equatorial Guinea)
DESCRIÇÃO DA ÁRVORE
Descrição botânica
The tree reaches a height of 32 to 43 m, sometimes to more than 50 m. The bole is cylindrical and clear to 23 m in length and more. The trunk diameter attains 100 up to 250 cm over large buttresses.
Habitat natural
Okoumé occurs abundantly in an area covering west and central Gabon and small areas of neighboring countries. It is known or inferred that the harvesting of specimens from the wild for international trade has, or may have, a detrimental impact on the spec
Distribuição natural
From Cameroon down to the Democratic Republic of the Congo.
Existência de plantações?
It is a long rotation species for plantation. The duration of the rotation is 40 years, to reach 60 cm in diameter.
IDENTIFICAÇÃO DA MADEIRA
Descrição anatômica da madeira (macro e micro)
Wood diffuse porous. Occasionally vessels exclusively solitary (over 90%). Tangential diameter of vessel lumina 150 to 200 micras (medium). Tyloses thin walled. Non-vestured pits. Vessels per mm2 6 to 10 (medium). Simple perforation plates. Vessel-ray pits large Paratracheal axial parenchyma scanty and/or vasicentric. 4 to 10 rays per mm (medium). Rays non-storied. Rays commonly 2 seriate. Silica bodies in the ray cells. Homogeneous rays and/or sub-homogeneous rays (all ray cells procumbent). Septate fibers present. Fibers with simple to minutely bordered pits.
DISPONIBILIDADE
Situação CITES sobre a proteção
Unrestricted
DESCRIÇÃO GERAL DA MADEIRA
Cor
The sapwood is greyish white, it has a thickness of 2 to 5 cm. The heartwood is salmon-pink to dark-pink, darkening on exposure, it is clearly demarcated. The silver figure is fine (barely visible).
Indice de cor
5
Grã
Straight or slightly interlocked, sometimes with an influence on further processing operations.
Veios ou desenhos na superfície
The texture varies from fine to medium.
Brilho
It is reported to be low in luster.
DURABILIDADE NATURAL
Slightly durable to decay. This species needs preservative treatment for uses with risks of occasional re-humidification. It is not suited for uses with risks of permanent or long-lasting humidification. Sensible to termites attack. The heartwood is resistant
Indice de durabilidade natural
6
Tensões internas do crescimento
No growth stresses are reported in this species.
Conteúdo de sílica
Silica Content: Silica presence is reported. Amounts over 0.05% may affect wood processing. Silica Value: 0.17
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)
0.41
Densidade seca ao ar 12% (g/cm³)
0.44
Contração Tangencial Total (Saturado até peso seco) (%)
6.9
Contração Radial Total (Saturado até peso seco) (%)
4.6
Programa de secagem recomendável
FR-7
Estabilidade dimensional (Contração Tangencial Total %/Contração Radial Total %)
1.5
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)
632
Flexão Estática a 12% (Módulo de elasticidade) (kgf/cm²)
98819
Resistência a compressão paralela as fibras a 12% (kgf/cm²)
370
Resistência a compressão perpendicular as fibras a 12% (kgf/cm²)
41
Cisalhamento radial a 12% (kgf/cm²)
58
Dureza Janka a 12% (perpendicular) (kgf)
240
Dureza Janka a 12% (paralela) (kgf)
336
TRABALHABILIDADE
Serrar ou Cortar
It is easy to saw.
Desdobro da tora em torno para lâminas
Suitable for slicing and peeling.
Desdobro da tora em faqueadeira para lâminas
Suitable for slicing and peeling.
Desgaste de ferramentas
Severe blunting effect; stellited blades for sawing and carbide tools for machining are recommended.
Aspectos do processamento em máquinas
Possible difficulties caused by interlocked grain are reported.
Aplainamento
Easy; no particular problems.
Aplicação para molduras
Easy; no particular problems.
Furação
Easy; no particular problems.
Fresagem_ranhura_canais
Easy; no particular problems.
Comportamento na aplicação de pregos
No particular problem.
Colagem
Glues well if basic gluing technical rules are followed.
Lixamento
Easy to perform; it gives good results.
Operação de lustre da superfície (brilho)
Can be polished without surface preparation.
Trabalhabilidade com ferramentas manuais
No particular problems.
USOS FINAIS RELATADOS
USOS FINAIS (RESUMO)
HOUSING GENERAL, boards, frames, steps, panelling, fittings, shutter boards, FURNITURE AND CABINETS, common furniture, PLYWOOD AND VENEER, faces, Decorative veneer, PACKING, heavy packing, pallets, OTHER AND MUSICAL INSTRUMENTS, door core, coffin, moldings
CASAS
- 10 - Silica in Timbers
Tábuas
- 13 - Dry kiln schedules for commercial woods. Temperate and tropical. Section III. Latin American (Mexico, Central, and South America) Woods–Conventional Temperatures
Marcos de portas
- 16 - Woods of the World
Degraus de escada
- 17 - Tree Conservation Database
Painéis
- 18 - W3TROPICOS Missouri Botanical Garden
Acessórios de madeira
- 19 - Silica in Timbers
Persianas
- 20 - Prospect: The wood database
MÓVEIS GABINETES
- 21 - Tropical timbers of the world. Part III-Southeast Asian and Oceanian Species.
Móveis comuns
- 23 - Handbook of Hardwoods
CHAPAS
- 25 - Directory of Timber Trade Malaysia
Lâminas de superfície das chapas
- 26 - Annual Review and Assessment of the World Timber Situation 1998-ITTO
Lâminas decorativas
- 28 - Ministry of Agriculture, Fisheries & Forest of Fiji
PALETES PARA EMBALAGENS
- 45 - Recopilación y Análisis de Estudios Tecnológicos de Maderas Peruanas
Caixotaria pesada
- 47 - Arvores Brasileiras
Paletes
- 48 - The strength properties of timbers
Alma de porta
- 76 - Descripción General y Anatómica de 105 Maderas del Grupo Andino.
Ataúde
- 78 - Amazonian Timbers for the International Market
Molduras de quadros
- 79 - Padronização da Nomenclatura Comercial Brasileira das Madeiras Tropicais Amazônicas, Sugestão
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