QUEBRACHO BLANCO (Aspidosperma quebracho-blanco)
Nome comercial
Quebracho blanco
Nome científico (autor)
Aspidosperma quebracho-blanco Schltdl.
Família
APOCYNACEAE
Nomes comuns
White quebracho; Weisse quebrachoholz; Quebraco bianco; Quebracho blanco lloron; Quebracho blanco colorado; Quebrachillo; Horco quebracho; Quebracho blanco
Nome científico sinônimo (autor
Macaglia quebracho-blanco (Schltdl.) Lyons; Aspidosperma crotalorum Speg.; Aspidosperma chakensis Speg.
DESCRIÇÃO DA ÁRVORE
Descrição botânica
It is a 15 to 18 m tall tree, with a trunk diameter of about 80 cm. Heights of up to 33 m and trunk diameters of up to 100 are also reported.
Habitat natural
Aspidosperma quebracho-blanco is found in the subtropical humid forests in the "Chaco" formation.
Distribuição natural
This species is reported to occur in the southern forests of Bolivia in Santa Cruz and Beni, close to the border with Paraguay in the "Chaco" area.
Usos não madeiravéis
The bark of this tree is reported to have alkaloids, and it is used as a natural medicine against pulmonary and cardiovascular ailments.
IDENTIFICAÇÃO DA MADEIRA
Descrição anatômica da madeira (macro e micro)
Wood diffuse porous. Vessels exclusively solitary (over 90%). Tangential diameter of vessel lumina 100 micras or less (very small). Vessels per mm2 10 to 20 (abundant). Simple perforation plates. Vessel-ray pits similar to intervessel pits in size and shape. In Apotracheal axial parenchyma diffuse and/or diffuse in aggregates. Prismatic crystals in non-chambered axial parenchyma cells. Prismatic crystals in chambered axial parenchyma cells and/or in fibers. 5 to 8 cells per parenchyma strand. Rays more than 10 per mm (abundant). Rays 1 to 4 seriate. Prismatic crystals in the ray cells. Homogeneous rays and/or sub-homogeneous rays (all ray cells procumbent). Fibers with distinctly bordered pits.
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Foto de madeira macroscópica (tangencial)
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Foto da secção transversal microscopica
DISPONIBILIDADE
Situação CITES sobre a proteção
Unrestricted
DESCRIÇÃO GERAL DA MADEIRA
Odor ou Cheiro
Pleasant smell is reported
Cor
The sapwood differentiated, it is pinkish yellow. It makes a sharp contrast with heartwood which is dark brown
Indice de cor
6
Grã
The grain is frequently interlocked.
Veios ou desenhos na superfície
The texture of the wood is fine.
Brilho
Luster is reported to be moderate.
DURABILIDADE NATURAL
This species is reported as durable, especially when it is not in contact with the ground.
Indice de durabilidade natural
1
Tratamento preservativo
Quebracho blanco is moderately permeable, it has a high retention of oil and water based preservatives.
PROPRIEDADES FÍSICAS DA MADEIRA
Densidade básica (Peso seco/Volume saturado) (g/cm³)
0.80
Densidade seca ao ar 12% (g/cm³)
0.92
Contração Tangencial Total (Saturado até peso seco) (%)
8.6
Contração Radial Total (Saturado até peso seco) (%)
4.7
Defeitos causados pela secagem
Ease of Drying: It is moderately difficult to air season, it dries at a moderate rate. Drying Defects: Slight checking and moderate warping are reported. Casehardening may occur in thick stock. Kiln Schedules: Drying of pieces over 40 mm is reported to be very difficult, slow drying is recommended.
Programa de secagem recomendável
US-T6-D2; UK-E
Estabilidade dimensional (Contração Tangencial Total %/Contração Radial Total %)
1.8
PROPRIEDADES QUÍMICAS DA MADEIRA
PROPRIEDADES MECÂNICAS DA MADEIRA
Resistência a flexão a 12% (Módulo de ruptura) (kgf/cm²)
977
Resistência a compressão paralela as fibras a 12% (kgf/cm²)
620
Dureza Janka a 12% (perpendicular) (kgf)
979
TRABALHABILIDADE
Serrar ou Cortar
Sawing of this species is reportedly fair.
Aspectos do processamento em máquinas
Machining is difficult because of its hardness, reinforced cutting tools are recommended.
Aplainamento
Planing of this species is fair.
Torneamento
30
Furação
Boring of this species is fair.
Comportamento na aplicação de pregos
This wood is difficult to nail.
Colagem
The behavior in gluing is fair.
Acabamento
It has a good finishing.
Operação de lustre da superfície (brilho)
Polishing behavior is fair.
Steam Bending
A. quebracho-blanco can be bent with good results.
Espécies alternativas
It has been suggested as a substitute for Ash or Hickory for tools handles. In situations where strength is important, it could replace rock maple or beech.
USOS FINAIS RELATADOS
USOS FINAIS (RESUMO)
EXTERIOR GENERAL, crossarms, crossties, HOUSING GENERAL, beams, joists, boards, flooring, frames, steps, FURNITURE AND CABINETS, common furniture, PLYWOOD AND VENEER, common veneer, TURNING, turned furniture, TOOLS, tool handles, agricultural tools, PACKING, pallets, CONTAINERS, truck bodies, truck flooring
EXTERIOR
- 1 - Tabela de resultados de ensaios fisicos e mecanicos
Cruzetas
- 7 - Maderas latinoamericanas. II, Quercus alata Q. costaricensis y Q. eugeniaefolia
Dormentes
- 8 - Maderas latinoamericas. III, Podocarpus standleyi ,Podocarpus oleifolius, Drims granadensis, Magnolia poasana y Didymopanax pittieri
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
Marcos de portas
- 16 - Woods of the World
Degraus de escada
- 17 - Tree Conservation 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 origem rotativa
- 29 - Embassy of Ecuador in Japan
Torneamento
- 30 - Embassy of Honduras in Japan
Artigos torneados
- 32 - Embassy of Cote d`Ivoire in Japan
FERRAMENTAS
- 42 - Utilización Industrial de Nuevas Especies Forestales en el Perú.
Mangos herramientas
- 43 - Maderas de Bolivia (Características y Usos de 55 Maderas Tropicales)
Cabos de instrumentos agrícolas
- 44 - Atlas of Peruvian Woods
PALETES PARA EMBALAGENS
- 45 - Recopilación y Análisis de Estudios Tecnológicos de Maderas Peruanas
Paletes
- 48 - The strength properties of timbers
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
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