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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.

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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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