Kayu Jati
Definition
Teak — a dense, oily hardwood (Tectona grandis) prized for its exceptional durability, dimensional stability, and resistance to moisture, rot, and insects. Kayu jati has been the premium structural and furniture timber in Javanese architecture for centuries, used for columns, beams, doors, window frames, and carved decorative elements. Java's teak forests, historically managed under the Perhutani state forestry system, have made Indonesian teak one of the world's most recognised hardwoods.
Example
The ornate carved teak columns and beams of the Keraton Yogyakarta have remained structurally sound for over 250 years — a testament to kayu jati's durability — and the palace still uses teak sourced from the same Central Java forests for restoration work.