APOROSA (Aporosa dioica)
Trade Name
Aporosa
Scientific Name
Aporosa dioica (Roxb.) Mull.Arg.
Family
EUPHORBIACEAE
Common Names
thaafu tasu (Vietnam); ngaxm (Vietnam); Nuan sian (Thailand); Khrop bai yai (Thailand); Khontab chang (Thailand); Pelangi (Malaysia); Pelangas (Malaysia); Pelangah (Malaysia); Renyung (Indonesia); Peuris (Indonesia)
Scientific Name Synonyms
Aporosa roxburghii Baillon.; Aporosa microcalyx (Hassk.) Hassk.; Aporosa aurita(Tul.) Miq.
Description Of The Tree
Botanical Description
It is an evergreen, dioecious, small to medium-sized trees up to 30 m tall. The bole is usually straight, up to 60 cm in diameter, without buttresses.
Wood Identification
Anatomic Description Of Wood
Wood diffuse porous. Vessel-ray pits reticulate and/or foraminate. Simple perforation plates. Intervessel pits medium, 7 to 10 micras. 4 to 10 rays per mm (medium). Sheath cells. Body ray cells procumbent with mostly 2 to 4 rows of upright and/or square marginal cells (Kribs-II).
Availability
Cites Status
Unrestricted
General Wood Description
Color
The sapwood is not clearly differentiated from the heartwood which is yellow brown to brown with orange or red purple tinges.
Grain
Straight grain is reported in this species.
Texture
This species is usually reported to have a moderately fine texture.
Natural Durability
It is moderately durable when exposed to the weather or in contact with the ground.
Natural durability index (1= Very high durability, 7=Vey low durability)
3
Silica Content
Silica Content: It is a non-siliceous timber.
Wood Physical Properties
Basic Density or Specific Gravity (O.D. weight/vol. green) (g/cm³)
0.65
Air-dry Density (Weight and volume at 12%MC) (g/cm³)
0.73
Drying Defects
Ease of Drying: It is reported to dry rapidly without serious degrade. Boards of 15 mm thick take about 2 months to air dry. Drying Defects: Risk of severe warping in pieces containing tension wood. Care should be taken to prevent blue stain. Slight checking may occur during drying. Kiln Schedules: Schedule recommended for Gubas. Boards with a thickness of 25 mm take approximately 5 days to kiln dry.
Wood Chemical Properties
Wood Mechanical Properties
Workability
Machining
The response of this species to machining operations is fair.
REFERENCED USES
End Uses Summary
HOUSING GENERAL, flooring, FURNITURE AND CABINETS, TOOLS, tool handles
General Housing
- 10 - Silica in Timbers
Flooring
- 14 - Handbook of Hardwoods
Furniture Cabinets
- 21 - Tropical timbers of the world. Part III-Southeast Asian and Oceanian Species.
Tools
- 42 - Utilización Industrial de Nuevas Especies Forestales en el Perú.
Tool Handles
- 43 - Maderas de Bolivia (Características y Usos de 55 Maderas Tropicales)
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