Keruing structural timber is a durable hardwood with a grain that ranges from straight to interlocking and a texture that can be moderately rough. It typically features a reddish-brown to dark brown heartwood, sometimes with a purplish hue and lighter-colored sapwood. Due to its strength and resistance to moisture and pests, Keruing is widely used in construction for structural elements.

Found in Kalimantan (Borneo), Sumatra, and parts of Sulawesi. It grows in lowland tropical rainforests.Used in heavy-duty construction, flooring, outdoor furniture, railway sleepers, boat building, and structural work.

​Scientific Name​: Dipterocarpus spp.
Density ​ ​ ​​: Approximately 720-880 kg/m³ at 12% moisture content
Color ​ ​ ​ ​: Reddish-brown to dark brown
Grain ​ ​ ​​: Straight to slightly interlocked
Texture ​ ​ ​ ​: Coarse
Durability ​ ​​: Moderately durable; resistant to insects and pests, but may require treatment for enhanced decay resistance in outdoor applications
Workability ​​: Can be challenging to work with due to its density; may require pre-drilling for nailing and can dull cutting tools; takes stains and finishes well with appropriate ​​ ​ ​ ​techniques
Growth Time ​​: Typically harvested between 20 to 30 years of growth for commercial use

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