Properties

Value / Description

Source(s)

Product name

Robinio sawn timber – rectangular or square, dimensionally accurate

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Dimensions

4x6, 5x8, 5x10, 6x6, 6x12, 7x7, 8x8, 8x10, 10x10, 14x24 cm

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Surface

planed (optional: sawn)

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Ends

trimmed

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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 deviation

technically dried (optional), 

slight dimensional tolerances

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Drying (optional)

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

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Density

Fresh: approx. 930 kg/m³

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)

55–70 N/mm²

DIN EN 384, TU Dresden

Tensile strength (parallel)

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 if 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 wood protection

DIN EN 335

Certifications (optional)

FSC® upon request

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