Corrosion protection life (CPL) is the period a coating can effectively shield a substrate from the aggressive action of its environment. The longer the CPL, the less frequent the maintenance cycles, which translates into lower life‑cycle costs for manufacturers.
Two primary factors drive CPL: the dry film thickness (DFT) applied and the severity of the service environment. A thicker film provides a larger barrier, while harsher environments accelerate degradation.
The relationship can be expressed with a simple empirical model that combines these variables. By adjusting the environment factor (E) and a coating‑system constant (C), the model predicts the expected service life in years.
DFT = dry film thickness (µm)
C = coating system constant (dimensionless)
E = environment factor (1 = mild, 2 = moderate, 3 = severe)
What is corrosion protection life?
How does dry film thickness affect CPL?
What role does the environment play in CPL?
Why is CPL important for manufacturers?
Can I use this calculator for any type of coating?
How do I interpret the results from this calculator?
What factors are not considered in this CPL calculation?
Results are for informational purposes only and do not constitute professional advice.