Parastemon urophyllus (Wallich ex A. DC.) A. DC.
Sempalawan; Nyalas; Ngilas; Mendailes; Melas; Mandailas; Kaju melas; Anggilas; Pink beam; Malas; Mengilas (Sarawak); Tempalawan (Brunei Darussalam); Mengilas (Malaysia)
Parastemon spicatus Ridley
It is a tree up to 40 m tall, often with small buttresses. The bole is cylindrical, branchless for 20 m, from 70 up to 180 cm in diameter.
Parastemon urophyllus is common along seashores and in primary, but more often in secondary forests. It is a typical component of peat swamps or fresh water swamp forests, growing on poor soils up to 700 m of altitude.
It occurs on the Malay Peninsula, Sumatra and Borneo.
Wood diffuse porous. Vessels in diagonal and/or radial pattern. Vessels exclusively solitary (over 90%). Vessels of two distinct diameter classes, wood not ring-porous. Occasionally tangential diameter of vessel lumina 200 micras or more. Vessels per mm2 less Occasionally apotracheal axial parenchyma diffuse and/or diffuse in aggregates. Occasionally paratracheal axial parenchyma scanty and/or vasicentric. Prismatic crystals in chambered axial parenchyma cells and/or in fibers. 5 to 8 cells per parenchyma strand. Rays more than 10 per mm (abundant). Occasionally rays exclusively uniseriate. Occasionally body ray cells procumbent with mostly 2 to 4 rows of upright and/or square marginal cells (Kribs-II). Occasionally body ray cells procumbent with one row of upright a Fibers very thick walled. Fibers with distinctly bordered pits.
The sapwood is not clearly differentiated from the red brown heartwood that turns pale brown on exposure.
The grain is straight or slightly interlocked.
This wood has a somewhat medium texture.
It is reported as moderately durable, but it is fairly resistant to teredo and other marine organisms.
Silica Content: Silica is present. Amounts over 0.05% may affect wood processing. Silica Value: 1
Ease of Drying: It takes 5 months to air dry boards 40 mm thick. Drying Defects: It is subject to warping, particularly in case of back-sawn boards. Distortion and surface checking are also reported, although not severe considering its density.
The wood contains a considerable amount of silica.
Wood of this species has a severe blunting effect.
It can be planed to a smooth surface.
This wood is difficult to nail, it needs pre-boring.
EXTERIOR GENERAL, bridges, poles, stakes posts, crossties, HOUSING GENERAL, flooring, SPORTS, TOOLS, agricultural tools, CONTAINERS, truck bodies, truck flooring, NAVAL CONSTRUCTION, boats, port pillar