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Woodworking Math

Tropical wood · Africa

Ekebergia wood

Ekebergia (Ekebergia rueppelliana, family Meliaceae) is a tropical timber from Africa. Dry, its Janka hardness is 900 lbf (4,003 N), and air-dry it weighs about 38 lb/ft³ (609 kg/m³). The figures are from the USDA Forest Products Laboratory's Tropical Timbers of the World, pp. 397–398.

Other names, by country: 01 Mokuna, Msisi (Tanzania), Mufumba (Uganda).

Key numbers

Janka hardness, dry
900 lbf (4,003 N)
As printed: “Janka side hardness 900 lb for dry material.”
Air-dry density
38 lb/ft³ (609 kg/m³)
Basic specific gravity
0.50 oven-dry weight, green volume
As printed: “Basic specific gravity (ovendry weight/green volume) 0.50; air-dry density 38 pcf.”
Shrinkage, green to 12% moisture content
4.3% tangential
Radial 1.7%

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% MC8,000 psi (55 MPa)—4,000 psi (28 MPa)

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

What the data sheet says

Color, grain and texture
Wood pinkish when freshly cut, turning whitish or pale brown on drying, sapwood and heartwood not clearly defined. Texture varies from fine to coarse; grain straight; sometimes figured.
Working properties
Easy to work with hand and machine tools, dresses to a smooth finish, nails easily but tends to split.
Durability
The wood is vulnerable to attack by decay fungi and termites, susceptible to blue stain.
Uses
Furniture, joinery, figured veneer, plywood, broom and brush handles, a general utility wood.
Where it grows
Widely distributed in montane forests of East Africa, also found in open grasslands and the coastal savanna belt.

Quoted from Tropical Timbers of the World, pp. 397–398, 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.