Scientific name

Juglans regia L.

Other names

English: Common walnut, Persian walnut, English walnut, European Walnut

Geographic origin

Southeast Europe, west Asia, Northwest India and Himalaya

Description

&;8226; Sapwood: from yellowish to greyish colour
&;8226; Heartwood: from greyish colour to brown colour with black shades
&;8226; Fiber: Straight, occasionally wavy
&;8226; Grain: medium size

Capacity of being impregnated

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

Mechanization

&;8226; Sawing process: No difficulties
&;8226; Drying process: Considerably fast. Risk of collapse and cementation
&;8226; Planing process and other processes: No difficulties
&;8226; Gluing process: Difficulties can arise from the use of alkaline glues.
&;8226; Nailing and screwing process: Easy.
&;8226; Finish: Easy

Physical properties

&;8226; Apparent density at 12% humidity 650 kg/m3 semi-heavy wood
&;8226; Dimensional stability
- Volumetric contraction coefficient 0.34 % highly stable wood
- Relation between contractions 1.45% no tendency to deformity
&;8226; Hardness (Chaláis-Meudon) 3.8 semi-hardwood

Mechanical properties

&;8226; Resistance to static flexion 970 kg/cm2 &;8226; Elasticity module 113,000 kg/cm2
&;8226; Resistance to compression 590 kg/cm2
&;8226; Resistance to parallel traction 970 kg/cm2

Observations

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