Kesternich testing simulates acid rain or industrial chemical exposure to evaluate the coating, substrate, or part's relative corrosion resistance.  Parts or panels are placed inside a specially designed chamber and are exposed to SO2  and condensation humidity before being evaluated for resistance to corrosion.

A specific volume of SO2 gas, usually 0.2L, 1L or 2L is introduced into the test chamber, the chamber temperature is increased to a predetermined level and the relative humidity is maintained at condensation levels. After a set period, the chamber is vented and the temperature is allowed to decrease to ambient conditions.