Scientific name

Juglans nigra L.

Other names

English: Eastern Black walnut, American Black walnut

Geographic origin

United States and Canada

Description

&;8226; Sapwood: from yellowish white to light grey
&;8226; Heartwood: from reddish grey to dark grey
&;8226; Fiber: Straight, occasionally wavy
&;8226; Grain: medium size

Capacity of being impregnated

&;8226; Sapwood: Capable of being impregnated
&;8226; Heartwood: Low capacity to no capacity of being impregnated

Mechanization

&;8226; Sawing process: No difficulties
&;8226; Drying process: Slow. Risk of collapse and cementation.
&;8226; Planing process and other processes: No difficulties
&;8226; Gluing process: Easy.
&;8226; Nailing and screwing process: Easy.
&;8226; Finish: Easy

Physical properties

&;8226; Apparent density at 12% humidity
610 kg/m3 semi-heavy wood
&;8226; Dimensional stability
- Volumetric contraction coefficient 0.43 % stable wood
- Relation between contractions 1.42% no tendency to deformity
&;8226; Hardness (Chaláis-Meudon) 3.6 semi-hardwood

Mechanical properties

&;8226; Resistance to static flexion 1010 kg/cm2
&;8226; Elasticity module 116,000 kg/cm2
&;8226; Resistance to compression 523 kg/cm2

Observations

Strong difference of colour between its very light Sapwood and the dark Heartwood.