SIMPOH (Dillenia obovata)
Trade Name
Simpoh
Scientific Name
Dillenia obovata (Blume) Hoogl.
Family
DILLENIACEAE
Common Names
Simpur rimba (Indonesia); Zinbyun (Myanmar); San-tong (Thailand); San-yai (Thailand); Mai-san (Myanmar); Simpoh ayer (Malaysia); Simpoh padang (Malaysia); Sempur batu (Indonesia); Simpur talang (Indonesia); Masan (Thailand)
Scientific Name Synonyms
Dillenia aurea
Description Of The Tree
Botanical Description
It is a medium-sized to fairly large deciduous tree up to 35 m tall, with often rather crooked bole. It is branchless for up to 14 m, but usually much less, and up to 70 cm in diameter. The buttresses are absent or small.
Natural Habitat
Dillenia obovata is found in lowland deciduous or evergreen secondary forests, up to 500 m of altitude. In Indochina it is reported up to 1,800 m of altitude.
Wood Identification
Anatomic Description Of Wood
Vessels per mm2 5 to 20. Wood diffuse porous. Vessels exclusively solitary (over 90%). Tangential diameter of vessel lumina 100 to 200 micras. Vessel-ray pits reticulate and/or foraminate. Vessel-ray pits similar to intervessel pits in size and shape. Apotracheal axial parenchyma diffuse and/or diffuse in aggregates. Axial parenchyma scalariform. Larger rays more than 4 seriate. Body ray cells procumbent with mostly 2 to 4 rows of upright and/or square marginal cells (Kribs-II). Sheath cells. 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
Color
The heartwood is red-brown to dark reddish-brown, sometimes with a purplish tinge, and usually not demarcated from the slightly paler sapwood.
COLOR INDEX (1=Black, 7=Light yellow,white)
4
Grain
The grain is straight or, more usually, interlocked.
Texture
The texture is moderately coarse and even.
Natural Durability
The wood is susceptible to dry-wood termites, blue stain and decay fungi.
Natural durability index (1= Very high durability, 7=Vey low durability)
4
Silica Content
Silica Content: It contains 0.1% silica.
Resistance To Impregnation
It can be readily impregnated with preservative substances.
Wood Physical Properties
Basic Density or Specific Gravity (O.D. weight/vol. green) (g/cm³)
0.53
Air-dry Density (Weight and volume at 12%MC) (g/cm³)
0.58
Total shrinkage Tangential (Saturated to 0%MC) (%)
12.0
Total shrinkage Radial (Saturated to 0%MC) (%)
3.0
Drying Defects
Ease of Drying: Air seasoning is reported to be good. Drying Defects: Slight bowing and staining are reported. Kiln Schedules: Schedule recommended for Litsea.
Recommended Dry Kiln Schedule
UK-C
Dimensional stability ratio (Total Tangential Shrinkage %/Total Radial Shrinkage %)
4.0
Wood Chemical Properties
Wood Mechanical Properties
Bending Strength (MOR),12%MC (kgf/cm²)
1103
Workability
Sawing
Sawdust can block the blades.
Rotary Veneer Cutting
It possible to produce decorative sliced veneer.
Sliced Veneer
It possible to produce decorative sliced veneer.
Machining
This species is easy to machine.
Planing
Planing is reported to be easy.
Boring
Boring operations are rated as easy to fair.
Nailing
It needs pre-bore for nails, but it screws well. The nail holding properties are poor.
Gluing
It has a good behavior in gluing.
Finishing
Finishing of this wood is rated as fair.
REFERENCED USES
End Uses Summary
HOUSING GENERAL
General Housing
- 10 - Silica in Timbers
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