Merbau
Scientific name: Intsia bijuga
Overview
Merbau is a dense, durable tropical hardwood widely used for flooring, heavy construction, and exterior applications. Native to Southeast Asia and parts of the Pacific, it is known for its rich brown coloration and exceptional resistance to moisture and decay.
Because of its strength and stability, Merbau is often compared to teak in performance, though it has a darker tone and coarser texture.
Quick Facts
- Common Name: Merbau
- Scientific Name: Intsia bijuga
- Region: Asian Hardwoods (Southeast Asia, Indonesia, Papua New Guinea, and Northern Australia)
- Tree Size: 100–150 ft tall, 3–5 ft trunk diameter
- Average Dried Weight: 53 lbs/ft³ (850 kg/m³)
- Janka Hardness: 1,925 lbf
- Color: Orange-brown to dark reddish brown, often with yellow mineral flecks
- Grain: Interlocked
- Texture: Coarse
Identification Characteristics
Merbau is identified by its dark reddish-brown heartwood and coarse texture. The grain is often interlocked, and small yellow mineral deposits may sometimes be visible in the pores.
Sapwood is pale and clearly differentiated from the darker heartwood.
Key identification traits include:
- Reddish-brown to dark brown heartwood
- Coarse texture
- Interlocked or wavy grain
- Occasional yellow flecks in pores
Working Properties
Merbau is strong and durable but can be challenging to machine due to its density.
- Machines moderately well with sharp tools
- Can cause tool dulling
- Sands to a smooth surface
- Good dimensional stability
- Holds fasteners securely
Pre-drilling is recommended for screws and nails.
Safety Note
Dust from Merbau may cause skin or respiratory irritation in sensitive individuals. Proper dust collection and personal protective equipment are recommended when cutting or sanding.
Common Uses
Merbau is commonly used in structural and heavy-duty applications, including:
- Hardwood flooring
- Exterior decking
- Stair components
- Heavy furniture
- Marine and outdoor construction
Its strength and natural durability make it especially valued for high-traffic and exterior environments.
Sustainability & Notes
Merbau has faced harvesting pressure in parts of Southeast Asia. Responsible sourcing and certification are encouraged to ensure legal and sustainable trade.
Availability remains strong in many markets, particularly for flooring products.
Comparative Notes & Related Species
Balau – A dense Southeast Asian hardwood widely used for decking and heavy outdoor construction due to its strength and durability.
Bangkirai – Another durable hardwood used in decking and exterior construction, valued for its hardness and resistance to wear.
Kempas – A strong Southeast Asian hardwood commonly used in flooring and heavy-duty woodworking applications.
Related Guides
Hardwood vs Softwood
Understand the fundamental differences between hardwood and softwood species, including structure, growth, and common uses.
Density & Hardness Explained (Janka Scale Guide)
Understanding hardness ratings helps explain the durability and wear resistance of hardwood species.
Machining Dense Tropical Hardwoods
Dense tropical hardwoods require sharp tools and careful machining techniques to achieve clean cuts and smooth finishes.
Compare Wood Properties
See how this species ranks in density and hardness using our Wood Density & Janka Hardness Chart. You can also explore Hardest Woods, Softest Woods, and Most Dense Woods for quick comparisons.
Collector Notes
Merbau is appreciated by collectors and craftsmen for its durability and bold grain. Boards with deep, uniform color and minimal sapwood are typically preferred.
The presence of natural mineral flecks can add character, though some collectors favor cleaner material for furniture projects.
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Wood Sample Collection
This species is part of an ongoing effort to document and preserve wood samples from around the world.
Learn more about contributing to the collection:
Resources
Authoritative botanical and forestry references used in compiling information about this species include:
• USDA Forest Service – Wood Handbook: Wood as an Engineering Material
https://www.fpl.fs.usda.gov/products/publications/
• The Wood Database – Global reference for wood identification, physical properties, and woodworking characteristics
https://www.wood-database.com/
• Royal Botanic Gardens, Kew – Plants of the World Online – Botanical taxonomy and species distribution database
https://powo.science.kew.org/
• International Union for Conservation of Nature (IUCN Red List) – Global conservation status assessments
https://www.iucnredlist.org/
• Convention on International Trade in Endangered Species (CITES) – International trade regulations for protected plant species
https://cites.org/
Additional forestry publications, academic research papers, and regional timber studies may also be referenced where available.
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Availability & Where to Buy
Exotic hardwood availability can vary significantly depending on region, sustainability regulations, and supplier inventory.
As this archive grows, recommended suppliers and specialty wood retailers will be listed here to help woodworkers locate responsibly sourced material.
Lumber Suppliers:
Availability varies — see the Where to Buy Exotic Woods page for current sources.
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