Common Name(s): Hard milkwood, hard alstonia
Scientific Name: Alstonia spectabilis (and A. macrophylla)
Distribution: South and Southeast Asia, Pacific Islands, and northern Australia
Tree Size: 100-130 ft (30-40 m) tall,
2-4 ft (.6-1.2 m) trunk diameter
Average Dried Weight: 46.2 lbs/ft3 (740 kg/m3)
Specific Gravity (Basic, 12% MC): .63, .74
Janka Hardness: 1,460 lbf (6,500 N)
Modulus of Rupture: 12,300 lbf/in2 (84.8 MPa)
Elastic Modulus: 1,960,000 lbf/in2 (13.52 GPa)
Crushing Strength: 10,140 lbf/in2 (69.9 MPa)
Shrinkage: Radial: 3.2%, Tangential: 4.7%,
Volumetric: 8.0%, T/R Ratio: 1.5