American Black walnut

Scientific name: Juglans nigra L.

Geographic origin: United States and Canada.

Description

  • Sapwood: from yellowish white to light grey.
  • Heartwood: from reddish grey to dark grey.
  • Fiber: straight, occasionally wavy.
  • Grain: medium size.

Capacity of being impregnated

  • Sapwood: capable of being impregnated.
  • Heartwood: low capacity to no capacity of being impregnated.

Mechanization

  • Sawing process: no difficulties.
  • Drying process: slow. Risk of collapse and cementation.
  •  Planing process and other processes: no difficulties.
  • Gluing process: easy.
  •  Nailing and screwing process: easy.
  • Finish: easy

Physical properties

  • Apparent density at 12% humidity 610 kg/m3 semi-heavy wood.
  • Dimensional stability
  • - Volumetric contraction coefficient 0.43 % stable wood.
  • - Relation between contractions 1.42% no tendency to deformity.
  • Hardness (Chaláis-Meudon) 3.6 semi-hardwood.

American Black walnut

Mechanical properties

  • Resistance to static flexion 1010 kg/cm2.
  • Elasticity module 116,000 kg/cm2.
  • Resistance to compression 523 kg/cm2.

American Black walnut

Observations

Strong difference of colour between its very light sapwood and the dark heartwood.