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DYSOX (Dysoxylum mollissimum)

Trade Name

Dysox

Scientific Name

Dysoxylum mollissimum Blume

Family

MELIACEAE

Common Names

Bawang (Indonesia); Ki bawang (Indonesia); Malaaduas (Philippines); Hairy-leaved himamau (Philippines); Australian pencil cedar; Tumbawa sela (Indonesia); Miva mahagony; Saurauira; Mata-mata (Philippines)

Scientific Name Synonyms

Dysoxylum richii (A. Gray) C. DC; Dysoxylum muelleri Benth.; Dysoxylum floribundum Merr.; Dysoxylum vitiensis

Description Of The Tree

Botanical Description

It can be a fairly large tree, up to 35 m tall, branchless up to 20 m and 80 cm of diameter. Sometimes buttresses 3 to 5 m high are present, the bole is fluted at the base.

Natural Habitat

Dysoxylum is reported in evergreen primary or sometimes in secondary forests, up to 2,000 m of altitude. It prefers well drained soils.

Non Timber Uses

The bark and seeds of some species of Dysox are reportedly poisonous, and have insecticidal properties.

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Wood Identification

Anatomic Description Of Wood

Wood diffuse porous. Tangential diameter of vessel lumina 200 micras or more (large). Occasionally vessels with colored deposits. Vessels per mm2 5 to 20. Vessels per mm2 more than 20 (very abundant). Vessels per mm2 less than 6 (rare). Simple perforation plate Occasionally axial parenchyma in marginal or in seemingly marginal bands. Axial parenchyma aliform. Axial parenchyma confluent. Occasionally prismatic crystals in chambered axial parenchyma cells and/or in fibers. 5 to 8 cells per parenchyma strand. Axial pare 4 to 10 rays per mm (medium). Occasionally rays exclusively uniseriate. Occasionally body ray cells procumbent with mostly 2 to 4 rows of upright and/or square marginal cells (Kribs-II). Body ray cells procumbent with one row of upright and/or square margina Septate fibers present. Fibers with simple to minutely bordered pits.

  • Wood Macro Photo Tangential Plane
  • Wood Micro Photo Of Transversal Section

Availability

Cites Status

Unrestricted

General Wood Description

Odor

Sometimes the wood has cedar-like or onion-like odor.

Color

The heartwood is pale reddish-brown or reddish-yellow, generally well or occasionally not distinctly demarcated from the white, yellowish or rather bright yellow or pale brown sapwood.

COLOR INDEX (1=Black, 7=Light yellow,white)

5

Grain

The grain is interlocked or wavy, occasionally straight.

Texture

The texture varies from fine to slightly coarse.

Natural Durability

The wood is reported to be non-durable to moderately durable when exposed to the weather or in contact with the ground. However, it is probably only moderately durable under exposed conditions.

Natural durability index (1= Very high durability, 7=Vey low durability)

6

Resistance To Impregnation

This species is easy to treat.

Wood Physical Properties

Basic Density or Specific Gravity (O.D. weight/vol. green) (g/cm³)

0.58

Air-dry Density (Weight and volume at 12%MC) (g/cm³)

0.64

Total shrinkage Tangential (Saturated to 0%MC) (%)

7.4

Total shrinkage Radial (Saturated to 0%MC) (%)

4.7

Drying Defects

Ease of Drying: Air seasoning is difficult. Drying Defects: It is reported to be prone to checking and warping. Quarter sawing is suggested to reduce degrade.

Recommended Dry Kiln Schedule

JP-25

Dimensional stability ratio (Total Tangential Shrinkage %/Total Radial Shrinkage %)

1.6

Wood Chemical Properties

Wood Mechanical Properties

Bending Strength (MOR),12%MC (kgf/cm²)

1105

Stiffness (MOE) 12%MC (kgf/cm²)

128331

Compression parallel to fiber 12%MC (kgf/cm²)

597

Compression perpendicular to fiber 12%MC (kgf/cm²)

102

Shear strength radial 12%MC (kgf/cm²)

138

Janka hardness (side) 12%MC (kgf)

649

Janka hardness (end grain) 12%MC (kgf)

695

Workability

Rotary Veneer Cutting

This species is reported to have good characteristics for lamination.

Sliced Veneer

This species is reported to have good characteristics for lamination.

Machining

The response of this species to machining operations is good to fair.

Nailing

The wood needs pre-boring for nailing.

REFERENCED USES

End Uses Summary

EXTERIOR GENERAL, poles, stakes posts, HOUSING GENERAL, flooring, frames, panelling, FURNITURE AND CABINETS, PLYWOOD AND VENEER, PACKING, pallets, NAVAL CONSTRUCTION, boats, boat deck, OTHER AND MUSICAL INSTRUMENTS, matches, coffin, moldings

Exterior General
  • 1 - Tabela de resultados de ensaios fisicos e mecanicos
Poles
  • 3 - Estudo dendrologico e determinacao das caracteristicas fisicas e mecanicas do genipapo (Genipa americana)
Stake Posts
  • 5 - Propriedades fisicas e mecanicas da madeira e do contraplacado de Pinus elliottii
General Housing
  • 10 - Silica in Timbers
Flooring
  • 14 - Handbook of Hardwoods
Frames
  • 16 - Woods of the World
Paneling
  • 18 - W3TROPICOS Missouri Botanical Garden
Furniture Cabinets
  • 21 - Tropical timbers of the world. Part III-Southeast Asian and Oceanian Species.
Panels, Veneers
  • 25 - Directory of Timber Trade Malaysia
Packing
  • 45 - Recopilación y Análisis de Estudios Tecnológicos de Maderas Peruanas
Pallets
  • 48 - The strength properties of timbers
Shipbuilding
  • 55 - Tropical Timber Atlas of Latin America
Boats
  • 56 - Manual de Identificación de Especies Forestales de la Subregión Andina.
Boat Decking
  • 59 - Programa Nacional de uso Sostenible de los Bosques e Incremento a las Exportaciones.
Matches
  • 71 - Proprietes physiques et mecaniques des bois tropicaux, premier supplement
Coffin
  • 78 - Amazonian Timbers for the International Market
Molding
  • 79 - Padronização da Nomenclatura Comercial Brasileira das Madeiras Tropicais Amazônicas, Sugestão

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