The pendulum hardness tester is an instrument used to assess the surface hardness of dried paints, enamels and coatings by measuring the damping time of an oscillation. Positioned in contact with the coated surface, the pendulum is set into oscillation and the instrument detects the time required for the oscillation amplitude to decrease according to the applied method.
The pendulum hardness test is based on the behaviour of the film when it is stressed by the oscillatory movement of the pendulum resting on the surface. A coating that damps the oscillation rapidly has a shorter test time and lower surface hardness; a harder film instead maintains the oscillation for a longer time.
This method is particularly useful when the surface behaviour of different paints or coatings must be compared after drying or curing. The test can support formulation development, verification of application cycles and quality-control activities on coated samples, providing an instrumental assessment of surface behaviour.
The pendulum hardness tester is suitable for paints, enamels, protective coatings and finishes applied to flat panels compatible with the test method. It can be used to check variations in surface hardness resulting from differences in formulation, drying conditions, curing times or process parameters.
Two procedures are available for evaluating coating hardness by pendulum: the König method and the Persoz method. Both assess film behaviour by measuring oscillation damping, but use different pendulums and operating conditions. The method should therefore be selected according to the applicable standard, technical specification or required inspection.
Three configurations are available:
- SA509/K, fitted with a König pendulum for testing according to the König method
- SA509/P, fitted with a Persoz pendulum for testing according to the Persoz method
- SA509/K+P, supplied with both pendulums, suitable where the laboratory needs to operate with the two procedures according to different inspection requirements
The König pendulum is suitable when the test must be carried out according to this specific damping procedure. The Persoz pendulum is intended for inspections requiring the corresponding method, providing a different configuration for evaluating coating surface hardness. Results obtained with the two methods must be interpreted according to the applied procedure and should not be considered automatically interchangeable.
The SA509/K+P configuration is particularly useful when coatings intended for different specifications are inspected or when both König and Persoz tests must be carried out. The availability of both pendulums makes it possible to manage different testing requirements with one instrument.
SA509 features automatic oscillation counting, supporting test execution and result determination. The instrument also displays test temperature and humidity, parameters that are useful to monitor when evaluating and comparing results obtained on coatings.
The SA509 pendulum hardness tester is used for testing in accordance with ISO 1522 and ASTM D4366, technical references for evaluating the surface hardness of paints and coatings through oscillation damping using König or Persoz pendulums.
The test is used in quality-control laboratories, during the development of coating products and when comparing finishes and coatings subjected to different drying or curing cycles. Measuring damping time makes it possible to check film surface behaviour under controlled conditions and compare samples assessed using the same method.
The pendulum hardness testers for paints and coatings therefore provide a dedicated solution for evaluating surface hardness using the König and Persoz methods, with three configurations available to suit the required testing procedures.
Applications
- Assessment of the surface hardness of dried paints and coatings
- Pendulum hardness testing on enamels and protective coatings
- Quality-control checks on coated panels and samples
- Comparison between different formulations or application cycles
- Verification of film behaviour after drying or curing
- Measurement of pendulum oscillation damping time
- König pendulum testing using the SA509/K configuration
- Persoz pendulum testing using the SA509/P configuration
- Execution of both methods using the SA509/K+P configuration
- Testing in accordance with ISO 1522 and ASTM D4366
FAQ – Pendulum hardness testers for paints and coatings
What is a pendulum hardness tester used for?
It is used to assess the surface hardness of a dried paint or coating by measuring the damping time of a pendulum oscillating on the surface.
How does a pendulum hardness test work?
The pendulum is positioned on the coated surface and set into oscillation. The instrument detects the time required for the oscillation amplitude to decrease according to the limits specified by the applied method.
What does damping time indicate?
A shorter damping time indicates that the coating reduces the oscillation more rapidly and has lower surface hardness according to the method used. A longer time is associated with a harder film.
What is the difference between the König and Persoz methods?
König and Persoz are two test procedures based on the same oscillation-damping principle, but they use different pendulums and operating conditions. The method to use depends on the applicable inspection reference.
Which model should be selected for a König test?
The SA509/K configuration, fitted with the corresponding pendulum, is suitable for testing according to the König method.
Which model should be selected for a Persoz test?
The SA509/P configuration, fitted with the specific pendulum for this procedure, is suitable for testing according to the Persoz method.
When should the SA509/K+P configuration be selected?
The SA509/K+P configuration is suitable when both the König and Persoz methods are required, for example to manage different inspection specifications with the same instrument.
Are results obtained with König and Persoz directly comparable?
No. The two methods use different configurations and operating conditions. Results must be assessed according to the applied procedure and compared with tests performed using the same method.
Which coatings can SA509 be used on?
It can be used on dried paints, enamels, finishes and coatings applied to flat samples compatible with correct test execution.
Why is it useful to display temperature and humidity during the test?
Environmental conditions can affect coating behaviour. Displaying them during the test helps document the conditions in which inspections are carried out and compare results more consistently.
Which standards does the SA509 pendulum hardness tester refer to?
The instrument is used for testing in accordance with ISO 1522 and ASTM D4366, references for evaluating the surface hardness of paints and coatings using König and Persoz pendulums.
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