Just to be clear
We are aware that Ulin is well known in Indonesia but less so in Europe and beyond. To help bridge that knowledge gap, we created a comparison chart that highlights Ulin’s specifications, numbers, and distinctive features.
Premium Hardwood Comparison (Metric)
Density (kg/m³)
Values shown in average at 12% moisture content
Janka Hardness (kN)
In practical terms when use for decking, flooring, construction etc.
Ulin feels harder to the touch and is more resistant to wear and abrasion (walking, dragging furniture) because of its density and silica.
Ipe Ipé is more resistant to denting from sharp impacts because of its toughness.
Ulin feels harder to the touch and is more resistant to wear and abrasion (walking, dragging furniture) because of its density and silica.
Ipe Ipé is more resistant to denting from sharp impacts because of its toughness.
Durability Class (EN 350)
Stability (Rating 1-5)
Longer bar = More Stable (Less movement with humidity changes).
Ulin:Extremely stable due to its high density and interlocked grain. It moves very little.
Ipé: Very stable, but slightly more prone to movement than Ulin.
Cumaru: Known to be the least stable of the three. It has a high tendency to warp, twist, and check (crack) as it dries or reacts to moisture changes. This is a critical factor for decking gaps and fastener holding.
Ulin:Extremely stable due to its high density and interlocked grain. It moves very little.
Ipé: Very stable, but slightly more prone to movement than Ulin.
Cumaru: Known to be the least stable of the three. It has a high tendency to warp, twist, and check (crack) as it dries or reacts to moisture changes. This is a critical factor for decking gaps and fastener holding.
Expected Lifespan (Years)
Estimates reflect typical outdoor decking performance. While all three are Class 1 (Very Durable), Ulin's superior resistance to marine borers and extreme decay allows it to outlast Ipé and Cumaro in harsh environments.
Ulin
Ipé
Cumaro