Koa / Hawaiian Koa

Common Name(s): Koa, Hawaiian Koa

Scientific Name: Acacia Koa

Distribution: Hawaii

Tree Size: 65-100 ft (20-30 m) tall, 3-5 ft (1-1.5 m) trunk diameter

Average Dried Weight: 38 lbs/ft3 (610 kg/m3)

Specific Gravity (Basic, 12% MC): .53, .61

Janka Hardness: 1,170 lbf (5,180 N)

Modulus of Rupture: 12,620 lbf/in2 (87.0 MPa)

Elastic Modulus: 1,503,000 lbf/in2 (10.37 GPa)

Crushing Strength: 7,060 lbf/in2 (48.7 MPa)

Shrinkage: Radial: 5.5%, Tangential: 6.2%, Volumetric: 12.4%, T/R Ratio: 1.1

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