Walnut (Black)

Species

Walnut (Black)

Juglans nigra

Top Portion is finished with water-base finish; bottom with oil-based finish

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.

Grain: Mostly straight and open, but some boards have burled or curly grain. Arrangements 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: Janka: 1010; (22% softer than Northern red oak).

Dimensional Stability: Average (7.8; 9% more stable than Northern red oak).

Durability: Moderately dense, very strong, good shock resistance. Not as dent-resistant as oak.

Workability

Sawing/Machining: Excellent machining qualities.

Nailing: No known problems.

Sanding: Sands satisfactorily.

Finishing: May be difficult to stain. To reduce the wood’s tendency to repel finish coats, surface resins may be removed with a 100% pure (not recycled) solvent that is compatibel with the finish to be used. Do not use water

Comments: Frequently used as a highlight material for borders or other inlay techniques.

Origin

Limited Available. North America

Sunshine Hardwood Flooring is a wood flooring contractor in Ada County that specializes in hardwood floor installation, dustless hardwood floor refinishing, custom wood floor makeovers and historically accurate repairs for older homes.