The König Persoz pendulum hardness tester evaluates coating hardness by measuring how long a pendulum oscillates while in contact with the surface. As the amplitude decreases, softer materials produce shorter damping times, providing a reliable indication of Koenig hardness and Persoz hardness depending on the selected test method.
Two standardized procedures are used worldwide:
- Persoz hardness is determined by measuring the time required for oscillation amplitude to reduce from 12° to 4°.
- König hardness (also written as Konig hardness) measures the reduction from 6° to 3°.
Both procedures share the same principle but differ in pendulum dimensions, oscillation periods, and test parameters. The QualiPHT™ König Persoz Pendulum Hardness Tester fully complies with major international standards, including ISO 1522, ASTM D4366, BS 3900-E5, DIN 53157, NBN T22-105, and NF T30-016. The instrument is available in Persoz, König, or combined dual-method configurations.