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Woodworking Math

Tropical wood · Africa

Monopetalanthus heitzii wood

Monopetalanthus heitzii (Monopetalanthus heitzii, family Leguminosae) is a tropical timber from Africa. Air-dry, it weighs about 33 lb/ft³ (529 kg/m³). The figures are from the USDA Forest Products Laboratory's Tropical Timbers of the World, pp. 461–462.

Other names, by country: Adoung de heitz (Gabon). ADOUNG

Key numbers

Janka hardness, dry
Not printed
Air-dry density
33 lb/ft³ (529 kg/m³)
Basic specific gravity
0.39 oven-dry weight, green volume
As printed: “Basic specific gravity (ovendry weight/green volume) 0.39; air-dry density 33 pcf.”
Shrinkage, green to oven-dry
6.8% tangential
Radial 4.0%, volumetric 10.8%

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% MC14,300 psi (99 MPa)1.3 million psi (9 GPa)7,200 psi (50 MPa)

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

What the data sheet says

Color, grain and texture
Wood pink-brown, darkens slightly on exposure; heartwood and sapwood not clearly demarcated. Texture fine and even; grain often interlocked.
Working properties
Works fairly well but tends to give a woolly finish, a reduced cutting edge angle is suggested to minimize tear due to interlocked grain; glues and nails well; easy to veneer.
Durability
Heartwood moderately durable; sapwood liable to stain and is vulnerable to powder-post beetle attack.
Uses
Furniture components, boxes and crates, light construction, plywood.
Where it grows
Reported only in northern parts of Gabon; prefers moist soils along rivers and swampy or occasionally inundated areas.

Quoted from Tropical Timbers of the World, pp. 461–462, 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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