For conditions C3

What coating thickness is required for corrosion activity category C3?

To answer this question, it is necessary to clarify the intended service life. There are three categories: low up to 7 years, medium from 7 to 15, high from 15 to 25 and very high over 25 years. For example, taking a medium service life, in this case when using epoxy primer (zinc‑free) and polyurethane enamel, the total coating thickness will be 180 µm.

Which part of the ISO 12944 standard is dedicated to the classification of environmental conditions?

Part 2 (ISO 12944-2).

What does corrosion resistance mean for condition C3?

ISO 12944 standard describes condition C3 as moderate in environmental aggressiveness. Typically it refers to urban and industrial atmospheres, moderate sulfur dioxide pollution. Coastal areas with limited salt exposure.