When talking about acacia or robinia wood, we should not over-generalize, as there are different types or species. Each of them with more or less different characteristics.

These trees belong to the Fabaceae family, with most of the species belonging to this family being found in Australia. Some of them are considered invasive species, so their cultivation is very limited or is not even considered a wood species, as is the case in Spain.

Among all of them, two types of wood stand out. On the one hand, the one known as black wattle (Acacia Melanoxylon) and native to Oceania, although in fact it is not entirely black. On the other hand, “False acacia” (Robinia Pseudoacacia), whose origin is mainly in North America, although it is normal to find it in temperate climates. It is this last one that we will talk about, as it is the most common and we usually refer to when we talk about acacia wood.

Characteristics of robinia or acacia wood

Color: The color varies from yellow to brown, acquiring reddish tones with aging. The heartwood is clearly differentiated from the sapwood.

Fiber: Direct.

Grain: Medium to thick.

Density: It is a heavy wood, with an approximate density of 770 kg / m3.

Toughness: Very hard wood with a Monnin test result of 9.5

Durability: It is a wood of good durability even outdoors. Withstands humidity and even insects and fungi attack very well.

Dimensional stability: Moderately stable wood.

  • Volumetric contraction coefficient: 0.40% moderately nervous.

Mechanical properties:

  • Compressive strength: 713 kg / cmtwo
  • Static flexural strength: 1,284 kg / cmtwo
  • Modulus of elasticity: 172,400 kg / cmtwo

WorkabilityAlthough the straight fiber favors its workability, its hardness complicates it.

  • Sawn. Easy.
  • Drying. Slow. There is a risk of deformation.
  • Brushed. Easy.
  • Glued. Easy.
  • Nailed and screwed. Requires knockouts.
  • Finish. Easy.

It also allows you to turn and bend the wood.

When working, it can cause mild allergies and eye irritation.

Price: In places where it is abundant, for example, in the United States, the price of acacia wood is similar to that of other quality woods such as oak or ash.

acacia color

Uses of Robinia or acacia wood

  • Outdoor and indoor furniture.
  • Ship building.
  • Floors and platforms.
  • Spinning.
  • Manufacture of plates, beams …
  • Countertops and cutting or cutting boards.
  • In countries where it is abundant, it is used as a post or even sleepers thanks to its good durability and resistance.