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Woodworking Math

Tropical wood · Africa

Vitex wood

Vitex (Vitex doniana, family Verbenaceae) is a tropical timber from Africa. Dry, its Janka hardness is 680 lbf (3,025 N), and air-dry it weighs about 30 lb/ft³ (481 kg/m³). The figures are from the USDA Forest Products Laboratory's Tropical Timbers of the World, pp. 535–536.

Other names, by country: Mfuru, Mgwobe (Tanzania), Munyamazi, Muhomozi (Uganda).

Key numbers

Janka hardness, dry
680 lbf (3,025 N)
As printed: “Janka side hardness 680 lb at 12% moisture content.”
Air-dry density
30 lb/ft³ (481 kg/m³)
Basic specific gravity
0.40 oven-dry weight, green volume
As printed: “Basic specific gravity (ovendry weight/green volume) 0.40; air-dry weight 30 pcf.”
Shrinkage, green to 12% moisture content
3.3% tangential
Radial 1.1%

One source: USDA Forest Products Laboratory, Tropical Timbers of the World (Chudnoff, 1979 edition), the only published source read for this wood

Strength

Bending strength is the modulus of rupture (MOR); stiffness is the modulus of elasticity (MOE); crushing strength is compression parallel to the grain. The sheet collects these from published tests: it prints one data set, each at the moisture content printed beside it, never restated as 12%.

MoistureBending strength (MOR)Stiffness (MOE)Crushing strength
12% MC5,950 psi (41 MPa)0.75 million psi (5.2 GPa)3,900 psi (27 MPa)

A dash means the sheet prints no value; none is filled in.

What the data sheet says

Color, grain and texture
Wood is whitish or yellow-gray, sapwood and heartwood are not differentiated. Texture medium to coarse; grain wavy or slightly interlocked.
Working properties
Works easily with hand or machine cools, drills easily but leaves a rough surface, nails well, too soft for good turnery, veneers well. Dust may cause dermatitis.
Durability
Heartwood is perishable; sapwood liable to stain.
Uses
Boxes and crates, utility furniture, joinery.
Where it grows
Widespread from tropical West Africa and extending eastward to Uganda, Kenya, and Tanzania; occurs in savanna and high rainfall areas.

Quoted from Tropical Timbers of the World, pp. 535–536, a USDA Forest Products Laboratory work in the public domain.

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Sources

  1. USDA Forest Products Laboratory, Tropical Timbers of the World (Chudnoff, USDA Forest Products Laboratory, 1979 edition), read 2026-11-07.

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