Pigment Volume Concentration
The pigment volume concentration is essential in determining the amount of a particular
pigment that can be added to the polymer of the coating. The pigment has to have
sufficient "wetting" by the polymer to create a protective coating. There
must be enough polymer to completely fill the voids between the pigment particles.
How to you calculate the PVC?
The following equation is used:
The point at which there is just sufficient polymer to wet the pigment particles
is known as the critical pigment volume concentration (CPVC). Below the CPVC there
is sufficient polymer for pigment wetting and above the CPVC there is not. There
are abrupt changes in the coatings properties at the CPVC. Below is a depiction
of PVC and property changes that occur at the CPVC.