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Woodworking Math

Tropical wood · Africa

Difou wood

Difou (Morus mesozygia, family Moraceae) is a tropical timber from Africa. Air-dry, it weighs about 54 lb/ft³ (865 kg/m³). The figures are from the USDA Forest Products Laboratory's Tropical Timbers of the World, pp. 463–464.

Other names, by country: Wonton (Ghana), Aye (Nigeria), Kankate (Zaire).

Key numbers

Janka hardness, dry
Not printed
Air-dry density
54 lb/ft³ (865 kg/m³)
Basic specific gravity
0.70 oven-dry weight, green volume
As printed: “Basic specific gravity (ovendry weight/green volume) 0.70; air-dry density 54 pcf.”
Shrinkage, green to oven-dry
5.8% tangential
Radial 3.3%, volumetric 8.0%

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% MC24,000 psi (165 MPa)2.26 million psi (15.6 GPa)12,800 psi (88 MPa)

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

What the data sheet says

Color, grain and texture
Heartwood yellow when freshly cut darkening on exposure to a goldenor coffee-brown; sapwood wide, grayish-white, distinct. Texture fine to moderately coarse; grain shallowly interlocked; moderately high luster.
Working properties
Works with moderate ease with most hand and machine tools, good sawing characteristics; glues well; takes a good finish; veneers well.
Durability
Heartwood vulnerable to attack by decay fungi and liable to termite attack.
Uses
Joinery, turnery, flooring, veneer.
Where it grows
Found on the edge of the humid rain forests from Senegal to the Cameroon and Gabon; also in dry savanna formations. Widely planted as a shade and farm boundary tree.

Quoted from Tropical Timbers of the World, pp. 463–464, 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.

How the tags work: How we source every number.