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Official Journal of the Japan Wood Research Society

Table 3 Pore dimensions and shapes of different structures in hardwoods

From: Effect of thermo-hydro-mechanical densification on microstructure and properties of poplar wood (Populus tomentosa)

Pore types

Diameter

Pore shape

References

Macro

 Resin canal

50–300 μm

Cylindrical

[32]

 Vessel lumen

20–400 μm

Cylindrical

[33]

 Tracheid lumen

20–30 μm

Irregular cylindrical

[33]

 Fiber lumen

~15 μm

Cylindrical

[33]

Macro/meso/micro

 Pores in cell wall

1–100 nm

Slit-shaped

[32]

 Microfibril clearance

2–4.5 nm

Slit-shaped

[32]

Micro

 Lignin

0.3–0.6 nm

Slit-shaped

[34, 35]