Malaysia, Sumatra and Borneo.
The grain is usually interlocked, but often spiral or wavy grain is present. The surface is moderately lustrous, and texture coarse but even. Abnormal veins of very hard rock-like tissue , usually discarded during conversion, may be found in converted stock.
The heartwood is orange-red to brown with numerous yellowish lines or streaks caused by parenchyma tissue surrounding the pores.
Averages 880 kg/m3 (55 lb/ft3), sometimes 1,000 kg/m3 (62 lb/ft3).
Bending strength – High
Crushing strength – High
Steam bending – Moderate
It dries reasonably well but where zones of abnormal tissue are present, there is a great tendency to split.
Machining properties vary with occasional severe blunting of tool edges due to hardness and fibrous texture; with interlocked grain in a 20 degrees cutting angle is necessary for planing. Pre-boring for nailing is advised. It takes glue, stain and polish satisfactorily, and when filled produces a good finish.
It is durable but subject to insect attack; it is resistant to preservative treatment, although the sapwood is permeable.
Heavy constructional work
Shingles from selected stock
Core stock for plywood
When treated is used for railway sleepers