Technical Specifications Property

Value / Description

Source(s)

Diameter (center)

Ø 7–40+ cm (Class “40 cm +” refers to the largest dimensions)

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Available lengths

Depending on diameter: - Ø 7–9 cm → 100–300 cm - Ø 10–19 cm → 100–600 cm - Ø 20–29 cm → 100–600 cm - Ø 30–40+ cm → 100–400 cm

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Durability class

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

DIN EN 350

Service life

Service life of 30–50 years in direct ground contact without chemical treatment (Durability class 1 – very durable)

DIN EN 350, IHD, WTA, TU Dresden

Consistency & shape deviations

± 20 % diameter tolerance, natural curvature & minor cracks permissible (as per DIN 7926-1 §4.2.7)

DIN 7926-1

Weight

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

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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)

ca. 17.000–19.000 N/mm²

DIN EN 338, DIN EN 384

Characteristic density

ca. 770–880 kg/m³

DIN EN 384

Drying behavior

Moderate shrinkage; tends to crack if dried too quickly

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Workability

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

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Certifications (optional)

FSC® upon request

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Weather resistance

Very high, even without chemical treatment – suitable for playgrounds, landscaping, hydraulic engineering

DIN EN 335

Brinell hardness (DIN EN 1534)

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

DIN EN 1534