Corrosivity classification C1

Corrosivity classification C1

The C1 classification system is part of the ISO 9223 standard, which provides guidelines for determining the corrosivity of atmospheres. In this system, corrosive environments are divided into several categories, ranging from C1 to C5, with C1 representing the least corrosive conditions.

In C1 environments, corrosive factors are generally mild compared to more severe classifications. While the levels of airborne pollutants and moisture are lower, they still pose a risk to susceptible materials over time. Factors such as humidity and occasional condensation can contribute to corrosion processes, albeit at a slower rate compared to more aggressive environments.

Industries operating in C1 environments typically include indoor settings with controlled atmospheres where exposure to corrosive agents is minimal. However, even in such environments, certain materials may require protection or periodic maintenance to prevent corrosion and ensure longevity.


Mitigating corrosion risks in C1 environments often involves selecting materials with inherent corrosion resistance or applying protective coatings. The recommended surface treatment is Electro-galvanizing. Regular inspections and maintenance routines are also recommended to monitor and address any signs of corrosion early on.

Understanding the nuances of C1 classification helps industries implement appropriate corrosion prevention strategies tailored to their specific environmental conditions. This proactive approach ensures the durability and reliability of materials used in less corrosive atmospheres according to established standards.