Meaning and Purpose
5.1 have found pendulum damping test in detecting the coating hardness difference has good sensitivity and the hardness is defined as the resistance to deformation.

5.2 The two procedures given in these test methods embody the principle that the softer the surface, the faster the oscillation amplitude of the pendulum in contact with the surface decreases. However, these test methods differ in terms of pendulum size, oscillation period, and amplitude.

5.3 generally speaking, the king of damping time is about pell, half of the pendulum.

5.4 in terms of measuring soft coating hardness, Persoz pendulum than Konig has more discrimination, but because it tends to skidding on the surface of the low friction coefficient, so may not be suitable for the test is hard, smooth film.

5.5 the pendulum and interaction between paint film is complex, depends on the elastic and viscoelastic, and may not be in two types of pendulum to establish a precise relationship between tests.

ASTM D4366-2021 Standard Test Method for Determining the Hardness of Organic Coatings by Pendulum Damping Test

Scope of
1.1 these test methods include the use of pendulum damping tester is to determine the hardness of organic coating, the organic coating has been applied in an acceptable plane surface rigidity, such as metal or glass panel.

1.2 based on pendulum type two kinds of different test methods are as follows:

1.2.1 test method A – king pendulum hardness testing.

1.2.2, test method B – pell, soz pendulum hardness testing.

1.3 This standard is similar to ISO 1522 in content (but not technically equivalent).

1.4 Values expressed in SI units should be considered standard values. Other units of measurement are not included in this standard.

ASTM D4366-2021 Standard Test Method for Determining the Hardness of Organic Coatings by Pendulum Damping Test

1.5 This standard is not intended to address all safety issues, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health and environmental practices and to determine the applicability of regulatory restrictions prior to use.

1.6 this international standard is the technical barriers to trade, according to the world trade organization committee issued “about setting international standards, guidelines and recommendations of the decision of the principle of” the establishment of the internationally recognized principles of standardization.