Properties

Value / Description

Source(s)

Product name

Robinio roundwood with bark – naturally grown

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Diameter (center)

10–40+ cm

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Available lengths

Diameter-dependent:
10–19 cm → 100–600 cm
20–29 cm → 100–600 cm
30–40+ cm → 100–400 cm

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Surface

with bark (not debarked)

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Wood species

Robinia (Robinia pseudoacacia), European hardwood

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Durability class

1–2 (highest natural durability according to DIN EN 350 – suitable for ground and water contact without treatment)

DIN EN 350

Service life

30–50 years in ground contact without chemical wood protection

DIN EN 350, IHD, WTA

Consistency & dimensional tolerance

naturally grown form, ± 20% diameter tolerance, curvature and cracking possible

DIN 7926-1

Drying

harvested in winter / air-dried

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Density

Fresh: approx. 930 kg/m³; oven-dry: approx. 660–790 kg/m³

DIN EN 384

Bending strength (fm,k)

100–130 N/mm² (D60)

DIN EN 338, DEPI

Compressive strength

55–70 N/mm²

DIN EN 384, TU Dresden

Tensile strength

70–100 N/mm²

DIN EN 384

Modulus of elasticity (bending)

approx. 17,000–19,000 N/mm²

DIN EN 338, EN 384

Brinell hardness (EN 1534)

40–45 N/mm² (very hard – harder than oak, beech, ash)

DIN EN 1534

Drying behavior

moderate shrinkage; prone to cracking when dried too quickly

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Workability

very hard wood, good machinability with carbide tools; pre-drilling recommended

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Weather resistance

very high, even without chemical treatment

DIN EN 335

Certifications (optional)

FSC® upon request

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