Borneo Ironwood Tree (Eusideroxylon zwageri)
Scientific Name: Eusideroxylon zwageri — A slow-growing evergreen rainforest tree famous for its exceptionally hard and durable timber.
Native Home: Borneo, Sumatra and parts of the Malay Peninsula.
Height: 30–50 m.
Lifespan: 500–1,000+ years.
Uses and Harvesting
Timber: Extremely hard, heavy and naturally resistant to insects, decay and moisture.
Harvesting: Mature trees are selectively harvested, although the species is threatened by overexploitation.
Age to Harvest: Often 80–120+ years for substantial timber.
Products: Heavy construction timber, bridges, marine structures, posts, flooring and outdoor furniture.
History and Global Production
Traditional Use: Historically used for houses, boats, bridges and durable structures.
Global Spread: Native to Southeast Asian rainforests, especially Borneo; internationally known as Borneo ironwood or belian.
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