Common walnut

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.

Common walnut

Applications

&;8226; Interior fine furniture and semiexterior. Carved, turned and bent furniture.
&;8226; Hollow carpentry and paneling, interior : doors, platform, friezes, molding, stairs.
&;8226; Decorative panels.

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 .

Common walnut

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.

Common walnut

Observations

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