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KABOK (Irvingia malayana)
Nome comercial
Kabok
Nome científico (autor)
Irvingia malayana Oliver ex Bennett
Família
SIMAROUBACEAE
Nomes comuns
Barking deer`s mango; Kayu batu (Indonesia); Bongin (Indonesia); Kabok; Kayu batu (Borneo); Kra bok (Thailand); Pauh kijang (Sumatra); Patok entilit (Sarawak); Taung-thayet (Myanmar); Bongin; Selangan tandok (Sabah); Pauh kijang (Malaysia); Pauh kijang (Indonesia)
Nome científico sinônimo (autor
Irvingia oliveri Pierre; Irvingia longipedicellata Gagnep.; Irvingia harmandiana Pierre
DESCRIÇÃO DA ÁRVORE
Descrição botânica
It is a large to very large tree up to 60 m tall. The bole is straight, up to 150 cm in diameter, with prominent, thin and steep buttresses up to 8 m high.
Habitat natural
Irvingia malayana grows scattered in primary lowland rain forests in drier locations, up to 300 m of altitude.
Distribuição natural
It can be found from Indo-China southwards to Sumatra and Borneo.
IDENTIFICAÇÃO DA MADEIRA
Descrição anatômica da madeira (macro e micro)
Wood diffuse porous. Occasionally tangential diameter of vessel lumina 100 micras or less. Vestured pits. Vessels per mm2 5 to 20. Simple perforation plates. Vessel-ray pits similar to intervessel pits in size and shape. Occasionally intervessel pits small, 7 m Apotracheal axial parenchyma diffuse and/or diffuse in aggregates. Paratracheal axial parenchyma scanty and/or vasicentric. Prismatic crystals in chambered axial parenchyma cells and/or in fibers. 3 to 4 cells per parenchyma strand. 5 to 8 cells per parenchym Occasionally rays more than 10 per mm (abundant). Ray height more than 1 mm. Body ray cells procumbent with over 4 rows of upright and/or square marginal cells (Kribs-I). Body ray cells procumbent with mostly 2 to 4 rows of upright and/or square marginal cel Fibers very thin walled. Fibers with distinctly bordered pits.
DISPONIBILIDADE
Situação CITES sobre a proteção
Unrestricted
DESCRIÇÃO GERAL DA MADEIRA
Cor
The heartwood is yellow-brown with a greenish tinge, somewhat differentiated from the pale yellow-brown or pale brown sapwood.
Indice de cor
5
Grã
It is shallowly interlocked.
Veios ou desenhos na superfície
Texture of this species is reported as moderately fine and even.
DURABILIDADE NATURAL
The is reported as moderately durable.
Indice de durabilidade natural
3
Tratamento preservativo
It absorbs preservatives easily.
PROPRIEDADES FÍSICAS DA MADEIRA
Densidade básica (Peso seco/Volume saturado) (g/cm³)
0.91
Densidade seca ao ar 12% (g/cm³)
1.07
Contração Tangencial Total (Saturado até peso seco) (%)
9.3
Contração Radial Total (Saturado até peso seco) (%)
5.7
Defeitos causados pela secagem
Ease of Drying: Needlewood has good drying characteristics, and is reported that 13 mm and 38 mm thick boards took about 2.5 months and 3 months, respectively to air dry in Malaysia. Figures from Indonesia indicate slower air drying, e.g. 7 months for 30 mm thick boards. Drying Defects: Risk of warping and checking. Reports from Indonesia say that slight to severe risk of cupping, bowing, twisting or splitting may occur.
Programa de secagem recomendável
UK-C
Estabilidade dimensional (Contração Tangencial Total %/Contração Radial Total %)
1.6
Programa de secagem detalhado
http://www.tropicaltimber.info/wp-content/uploads/2015/08/KD_British_ENG.pdf
PROPRIEDADES QUÍMICAS DA MADEIRA
PROPRIEDADES MECÂNICAS DA MADEIRA
Resistência a compressão paralela as fibras a 12% (kgf/cm²)
718
Resistência a compressão perpendicular as fibras a 12% (kgf/cm²)
129
Cisalhamento radial a 12% (kgf/cm²)
173
Dureza Janka a 12% (perpendicular) (kgf)
1341
Dureza Janka a 12% (paralela) (kgf)
1261
TRABALHABILIDADE
Serrar ou Cortar
Cutting resistance is generally high.
Desdobro da tora em torno para lâminas
If thoroughly steamed can produce decorative sliced veneers with colored stripes.
Desdobro da tora em faqueadeira para lâminas
If thoroughly steamed can produce decorative sliced veneers with colored stripes.
Aspectos do processamento em máquinas
Special cutters are needed because of the presence of interlocked grain.
Comportamento na aplicação de pregos
It needs pre-boring for nailing and screwing.
Acabamento
It has a bad finishing, rough surfaces require sanding.
USOS FINAIS RELATADOS
USOS FINAIS (RESUMO)
EXTERIOR GENERAL, crossties, HOUSING GENERAL, flooring, panelling, FURNITURE AND CABINETS, cabinets, SPORTS, TOOLS, tool handles
EXTERIOR
- 1 - Tabela de resultados de ensaios fisicos e mecanicos
Dormentes
- 8 - Maderas latinoamericas. III, Podocarpus standleyi ,Podocarpus oleifolius, Drims granadensis, Magnolia poasana y Didymopanax pittieri
CASAS
- 10 - Silica in Timbers
Pisos
- 14 - Handbook of Hardwoods
Painéis
- 18 - W3TROPICOS Missouri Botanical Garden
MÓVEIS GABINETES
- 21 - Tropical timbers of the world. Part III-Southeast Asian and Oceanian Species.
Gabinetes
- 24 - Empire Timbers
INSTRUMENTOS ESPORTIVOS
- 38 - Annual Review and Assessment of the World Timber Situation 1998-ITTO
FERRAMENTAS
- 42 - Utilización Industrial de Nuevas Especies Forestales en el Perú.
Mangos herramientas
- 43 - Maderas de Bolivia (Características y Usos de 55 Maderas Tropicales)
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