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Softwood and Hardwood - Structural Strength Classes

Strength classes, bending stress and mean density of hardwood and softwood

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Structural timer is classified according the EU-code in different strength grades - where

D-Classes - refer to Deciduous Tree Species
C-Classes - refer to Coniferous Tree Species

Strength classes and structural softwoods and hardwoods physical properties:

Strength Class	Characteristic Minimum Bending Strength - σ - (MPa)	Typical Density - ρ - (kg/m³)
C14	14	350
C16	16	370
C18	18	380
C20	20	390
C22	22	410
C24	24	420
C27	27	450
C30	30	460
C35	35	480
C40	40	500
C45	45	520
C50	50	550
D30	30	640
D35	35	670
D40	40	700
D50	50	780
D60	60	840
D70	70	1080

1 MPa = 10⁶ Pa
BS EN 338

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