Properties

Value / Description

Source(s)

Product name

Robinio untrimmed boards with bark – optionally debarked

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Thicknesses

25, 28, 30, 32, 42, 52, 62 mm

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Widths

from 16 cm upwards

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Available lengths

200–300 cm

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Surface

sawn

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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 outdoors without chemical treatment

DIN EN 350, IHD, WTA

Consistency & dimensional tolerance

technically dried (optional),
minor dimensional deviations

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Drying (optional)

kiln-dried to approx. 12–16% wood moisture

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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 parallel to grain

55–70 N/mm²

DIN EN 384, TU Dresden

Tensile strength parallel to grain

70–100 N/mm²

DIN EN 384

Modulus of elasticity (bending)

approx. 17,000–19,000 N/mm²

DIN EN 338, DIN EN 384

Brinell hardness (DIN 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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