Abstract

The ‘real’ critical pigment volume concentration (CPVC) is defined, in its simplest form, as the pigment concentration at which porosity starts and above which a coating layer is porous. This CPVC, as measured by means of mercury porosimetry, was collated with the ‘CPVCs’ determined from certain coating properties versus pigment volume concentration plots. In most cases the slope discontinuities, generally identified also as CPVCs, do not coincide with this ‘real’ CPVC.

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