Pendulum Hardness Testers – SA509

Pendulum Hardness Testers - SA509
Pendulum Hardness Testers – SA509

A pendulum hardness tester is used to measure the surface hardness of coatings. The gauge is placed in contact with the coating surface and set into oscillation. The time required for the oscillation amplitude to decrease to a defined value, as specified by the given standard, is measured. The shorter the damping time, the lower the hardness.

There are two test procedures: König and Persoz. The Persoz method measures the time for the oscillation amplitude to decrease from 12° to 4°, while the König method measures from 6° to 3°. Both methods operate on the principle that the oscillation amplitude of a pendulum decreases more rapidly on softer surfaces, but they differ in the diameter, weight, period, and amplitude of oscillation.

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