Properties [S.I.]

Aluminum

SMP

Melamine

Density $\rho$

990

2700

8.8

Elastic Modulus $E$

71 × 10⁹

Rheological

8 × 10⁴

Poisson’s ratio $\nu$

0.37

0.33

0.4

Damping ratio $\eta$

0.7%

Rheological

17%