Wengue

Scientific name: Scientific name: Millettia laurentii De Wild.; M. stuhlmannii Taub.

Geographic origin: Africa

Description

  • Sapwood: yellowish white.
  • Heartwood: Dark grey to chocolate grey.
  • Fiber: Straight.
  • Grain: medium size to rough

Capacity of being impregnated

  • Sapwood: Medium capacity of being impregnated
  • Heartwood: No capable of being impregnated

Mechanization

  • Sawing process: ordinary difficulties arise from hardness and abrasability
  • Drying process: Slow. Low risk of deformation and high risk of crack formation.
  • Planing process: Difficulties arise from hardness, abrasability.
  • Gluing process: Tannins hamper proper adherence.
  • Nailing and screwing process: pre-drilling is recommended due to hardness.
  • Finish: No particular difficulties arise.

Physical properties

  • Apparent density at 12% humidity 0.85 kg/m3 very heavy wood
  • Density 450kg/m3
  • Dimensional stability
  • Volumetric contraction coefficient 0.54 % very nervous wood
  • Relation between contractions 1.6% no tendency to deformity
  • Hardness (Chaláis-Meudon) 8.1 very hard wood

Wengue
Mechanical properties

  • Resistance to static flexion 1,800 kg/cm3
  • Elasticity module 180,000 kg/cm3
  • Resistance to compression 800 kg/cm3

Wengue
Observations

  • When sawing it can have a yellowish color, which darkens the next day, obtaining the typical dark brown color of wenge.
  • It is one of the darkest woods that are marketed and the price is quite high due to its scarcity.