Wood Species - Walnut
AMERICAN BLACK WALNUT
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.
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.
Sawing/Machining: Easily worked with hand tools, and has excellent machining
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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