|
Pendulum Hardness
This method evaluates hardnes.s by measuring the damping time of an oscillating pendulum. The pendulum rests with 2 stainless steel balls on the coating surface. A physical relationship exists between oscillation time, amplitude and the geometrie dimensions of the pendulum. The viscoelastic behavior of the coating determines its hardness.
When the pendulum is set into motion, the balls roll on the surface and put pressure on the coating. Depending on the elasticity, the damping will be stronger or weaker. If there are no elastic forces, the pendulum will damp stronger. High elasticity will cause weak damping.
Two types of pendulums were standardized for this test method:
|
