QUEBRACHO BLANCO (Aspidosperma quebracho-blanco)
Trade Name
Quebracho blanco
Scientific Name
Aspidosperma quebracho-blanco Schltdl.
Family
APOCYNACEAE
Common Names
White quebracho; Weisse quebrachoholz; Quebraco bianco; Quebracho blanco lloron; Quebracho blanco colorado; Quebrachillo; Horco quebracho; Quebracho blanco
Scientific Name Synonyms
Macaglia quebracho-blanco (Schltdl.) Lyons; Aspidosperma crotalorum Speg.; Aspidosperma chakensis Speg.
Description Of The Tree
Botanical Description
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.
Natural Habitat
Aspidosperma quebracho-blanco is found in the subtropical humid forests in the "Chaco" formation.
Natural Distribution
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.
Non Timber Uses
The bark of this tree is reported to have alkaloids, and it is used as a natural medicine against pulmonary and cardiovascular ailments.
Wood Identification
Anatomic Description Of Wood
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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Wood Macro Photo Tangential Plane
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Wood Micro Photo Of Transversal Section
Availability
Cites Status
Unrestricted
General Wood Description
Odor
Pleasant smell is reported
Color
The sapwood differentiated, it is pinkish yellow. It makes a sharp contrast with heartwood which is dark brown
COLOR INDEX (1=Black, 7=Light yellow,white)
6
Grain
The grain is frequently interlocked.
Texture
The texture of the wood is fine.
Luster
Luster is reported to be moderate.
Natural Durability
This species is reported as durable, especially when it is not in contact with the ground.
Natural durability index (1= Very high durability, 7=Vey low durability)
1
Resistance To Impregnation
Quebracho blanco is moderately permeable, it has a high retention of oil and water based preservatives.
Wood Physical Properties
Basic Density or Specific Gravity (O.D. weight/vol. green) (g/cm³)
0.80
Air-dry Density (Weight and volume at 12%MC) (g/cm³)
0.92
Total shrinkage Tangential (Saturated to 0%MC) (%)
8.6
Total shrinkage Radial (Saturated to 0%MC) (%)
4.7
Drying Defects
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.
Recommended Dry Kiln Schedule
US-T6-D2; UK-E
Dimensional stability ratio (Total Tangential Shrinkage %/Total Radial Shrinkage %)
1.8
Wood Chemical Properties
Wood Mechanical Properties
Bending Strength (MOR),12%MC (kgf/cm²)
977
Compression parallel to fiber 12%MC (kgf/cm²)
620
Janka hardness (side) 12%MC (kgf)
979
Workability
Sawing
Sawing of this species is reportedly fair.
Machining
Machining is difficult because of its hardness, reinforced cutting tools are recommended.
Planing
Planing of this species is fair.
Turning
30
Boring
Boring of this species is fair.
Nailing
This wood is difficult to nail.
Gluing
The behavior in gluing is fair.
Finishing
It has a good finishing.
Polishing
Polishing behavior is fair.
Steam Bending
A. quebracho-blanco can be bent with good results.
Substitute Species
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.
REFERENCED USES
End Uses Summary
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 General
- 1 - Tabela de resultados de ensaios fisicos e mecanicos
Crossheads Crossarms
- 7 - Maderas latinoamericanas. II, Quercus alata Q. costaricensis y Q. eugeniaefolia
Crossties
- 8 - Maderas latinoamericas. III, Podocarpus standleyi ,Podocarpus oleifolius, Drims granadensis, Magnolia poasana y Didymopanax pittieri
General Housing
- 10 - Silica in Timbers
Beams
- 11 - Prospect: The wood database
Joists
- 12 - Tropical timbers of the world. Part I-Tropical American Species
Boards
- 13 - Dry kiln schedules for commercial woods. Temperate and tropical. Section III. Latin American (Mexico, Central, and South America) Woods–Conventional Temperatures
Flooring
- 14 - Handbook of Hardwoods
Frames
- 16 - Woods of the World
Steps
- 17 - Tree Conservation Database
Furniture Cabinets
- 21 - Tropical timbers of the world. Part III-Southeast Asian and Oceanian Species.
Furniture, Common
- 23 - Handbook of Hardwoods
Panels, Veneers
- 25 - Directory of Timber Trade Malaysia
Common Veneer
- 29 - Embassy of Ecuador in Japan
Turning
- 30 - Embassy of Honduras in Japan
Turned Articles
- 32 - Embassy of Cote d`Ivoire in Japan
Tools
- 42 - Utilización Industrial de Nuevas Especies Forestales en el Perú.
Tool Handles
- 43 - Maderas de Bolivia (Características y Usos de 55 Maderas Tropicales)
Agricultural Tools
- 44 - Atlas of Peruvian Woods
Packing
- 45 - Recopilación y Análisis de Estudios Tecnológicos de Maderas Peruanas
Pallets
- 48 - The strength properties of timbers
Truck Body
- 53 - Timbers of the New World
Truck Flooring
- 54 - Bulletin of the Government Forest Experiment Station N.157: Identification of Tropical Woods
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