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 Cumaru

Cumaru Species 

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Species - Domestic

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


Appearance

Color:At first, red-brown or purple-brown with light yellow-brown or purple streaks, after exposure uniform light brown or yellow-brown.

Grain:  Fine texture, interlocked, waxy or oily feel.

Variations:  WDramatic shading that mellows as the floors matures

Workability

Sawing/Machining: Works well, but is very hard – use carbide blades and bits.

Sanding: Scratches are easily seen – each sanding. Suggested Sequence:
First Cut: 36 or 40
Second Cu: 50 or 60
Third Cut: 80
Hard Plate: 100
Screen: 80, then 100


Nailing: Predrilling and hand-nailing is preferred.

Finishing: Test all products before using them on the actual floor. Oil-modified finishes may not dry if standard procedures are followed. Moisture-cure urethane, conversion varnish, or water base finishes are generally more successful.

Comments Has been known to cause contact dermatitis.

Properties

Hardness/Janka: 3540; 174% harder than Northern red oak

Dimensional Stability: Average (7.6; 7% more stable than red oak).

Durability: Availability

Moderately available.

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