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MUIRAPIXUNA (Cassia scleroxylon)
Trade Name
Muirapixuna
Scientific Name
Cassia scleroxylon Ducke Cassia scleroxylon Ducke
Family
LEGUMINOSAE
Common Names
Muirapixuna (Brazil)
Scientific Name Synonyms
Chamaecrista scleroxylon (Ducke) H.S. Irwin & Barn
Description Of The Tree
Botanical Description
This species presents small to medium size trees. The boles are straight or occasionally twisted, with average commercial lengths of 6 m and average diameters of 45 cm.
Natural Distribution
This species is distributed in the Amazon region.
Wood Identification
Anatomic Description Of Wood
Wood diffuse porous. Vessels solitary and in short radial multiples. Tangential diameter of vessel lumina 200 micras or more (large). White deposits in heartwood vessels. Vessels per mm2 10 to 20 (abundant). Simple perforation plates. Vessel-ray pits similar to Axial parenchyma aliform. Axial parenchyma confluent. Axial parenchyma in discontinuous tangential lines. Prismatic crystals in chambered axial parenchyma cells and/or in fibers. Axial parenchyma in narrow bands on lines up to 3 cells wide. 4 to 10 rays per mm (medium). Rays 1 to 4 seriate. Homogeneous rays and/or sub-homogeneous rays (all ray cells procumbent). Fibers with simple to minutely bordered pits.
Availability
Cites Status
Unrestricted
General Wood Description
Odor
The wood has no specific odor or taste.
Color
The heartwood and sapwood are distinct. The heartwood is very dark brown to black, and the sapwood is very pale brown.
Grain
The grain is usually straight or wavy.
Texture
This species is usually reported to have a medium texture.
Luster
Luster is reported to be moderate.
Natural durability index (1= Very high durability, 7=Vey low durability)
2
Resistance To Impregnation
The heartwood is reported to be impermeable.
Wood Physical Properties
Basic Density or Specific Gravity (O.D. weight/vol. green) (g/cm³)
1.01
Air-dry Density (Weight and volume at 12%MC) (g/cm³)
1.20
Total shrinkage Tangential (Saturated to 0%MC) (%)
8.2
Total shrinkage Radial (Saturated to 0%MC) (%)
3.6
Recommended Dry Kiln Schedule
BR-B
Dimensional stability ratio (Total Tangential Shrinkage %/Total Radial Shrinkage %)
2.3
Wood Chemical Properties
Wood Mechanical Properties
Bending Strength (MOR),12%MC (kgf/cm²)
1844
Stiffness (MOE) 12%MC (kgf/cm²)
167000
Compression parallel to fiber 12%MC (kgf/cm²)
982
Compression perpendicular to fiber 12%MC (kgf/cm²)
232
Shear strength radial 12%MC (kgf/cm²)
203
Janka hardness (side) 12%MC (kgf)
1558
Janka hardness (end grain) 12%MC (kgf)
1483
Workability
Planing
Planing operations are reported to be fair, risk of grain tearing is reported.
Boring
Boring is reported to be fair, but with good surface finishing.
Sanding
Sanding operations are fair, with fair finishing.
Response To Hand Tools
This species is reported to be difficult to cut.
REFERENCED USES
End Uses Summary
EXTERIOR GENERAL, HOUSING GENERAL, FURNITURE AND CABINETS
Exterior General
- 1 - Tabela de resultados de ensaios fisicos e mecanicos
General Housing
- 10 - Silica in Timbers
Furniture Cabinets
- 21 - Tropical timbers of the world. Part III-Southeast Asian and Oceanian Species.
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