Wood Species - Walnut


AMERICAN BLACK WALNUT
Juglans nigra

Appearance
Color: Heartwood ranges from a deep, rich dark brown to a purplish black. Sapwood is nearly white to tan. Difference between heartwood and sapwood color is great; some flooring manufacturers steam lumber to bleed the darker heartwood color into the sapwood, resulting in a more uniform color.
Grain: Mostly straight and open, but some boards have burled or curly grain. Arrangement of pores is similar to hickories and persimmon, but pores are smaller in size.
Variations within species and grades: Great variety of color and figure within species, as well as variation in color among boards, especially in lower grades and from material that isn't steamed prior to kiln-drying.

Properties
Hardness (Janka): 1010; 22% softer than Northern red oak.
Dimensional Stability: Excellent (change coefficient .00274; 26% more stable than red oak).
Durability: Moderately dense, very strong, good shock resistance. Not as dent-resistant as oak.

Workability
Sawing/Machining: Easily worked with hand tools, and has excellent machining qualities.
Sanding: Sands satisfactorily.
Nailing: Fair resistance to splitting; good holding ability.
Finishing: Finishes nicely, with a handsome grain pattern.
Comments: Distinctive sweet aroma when worked. Frequently used as a highlight material for borders or other inlay techniques.

From The National Wood Flooring Association's "Wood Species Used in Wood Flooring" information booklet.


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