Aporosa dioica (Roxb.) Mull.Arg.
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)
Aporosa roxburghii Baillon.; Aporosa microcalyx (Hassk.) Hassk.; Aporosa aurita(Tul.) Miq.
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 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).
The sapwood is not clearly differentiated from the heartwood which is yellow brown to brown with orange or red purple tinges.
Straight grain is reported in this species.
This species is usually reported to have a moderately fine texture.
It is moderately durable when exposed to the weather or in contact with the ground.
Silica Content: It is a non-siliceous timber.
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.
The response of this species to machining operations is fair.
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