A pendulum resting on a coating surface is set into oscillation, and the time for the oscillation amplitude to decrease by an amount specified in this International Standard is measured. The shorter the damping time, the lower the hardness.
Two test procedures are considered in some detail, namely those of König and Persoz. The Persoz and König methods differ by the period and amplitude of the oscillation. The Persoz test measures the time taken for the amplitude of oscillation to decrease from 12° to 4°; the König from 6° to 3°.
The instruments embody the same principle - that the amplitude of oscillation of a pendulum touching a surface decreases more rapidly the softer the surface - but differ in respect of dimensions, period, and amplitude of oscillation.
Our BGD 509 Pendulum Hardness Tester can be used in accordance with the following National and International Standards: ISO 1522; ASTM D4366; BS 3900-E5; DIN 53157; NBN T22-105; NF T30-016.
We offer three different model types: Persoz (BGD 509/P), König (BGD 509/K), and Persoz and König combined (BGD 509/K+P).
Standards
ISO 1522 (which supersedes ASTM D4355)
ASTM D4366
BS 3900-E5
DIN 53157
NBN T22-105
NF T30-016
Technical Specification
Automatic counter range: 0–999 times
High precision machined pendulums are stable, ensuring repeatable and comparable testing results
Can perform two test procedures: König or Persoz test
Suitable for different thickness substrates from 0.3mm to 6.0mm
User-friendly LCD operator interface
Release pendulum with shutter release for more accurate test results
Specially designed lifting platform can fix specimens easily, and the platform remains stable and shake-free when the pendulum is oscillating
Spirit levels produced specially have high precision, allowing customers to adjust the level precisely
Automatically record the time or times for the amplitude of swing to decrease from one angle to another and stop testing automatically
Record the data with two light-sensitive sensors
Can select record mode freely: Timing mode or counting mode
Perspex cover reduces the effects of airflow on final results
