Special corrosion test performed to estimate the resistance of coatings to corrosive effects of sulfur dioxide from chimney waste.

Organic chemical compounds containing a carbonyl group (C=O) and having a general formula given below.

Hardness measured by marking the coating film using a diamond tip that carries a certain weight. Knoop hardness is calculated by dividing the mass, that applies the weight, by the area of the mark observed on the surface.