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TECHNICAL DATAHOW PROTECTIVE COATINGS WORK848exmweb.com | 1-800-363-2423 | [email protected] Category Rating Typical EnvironmentsC1 Very Low Indoor Climate Controlled %u2013 Clean Atmospheres C2 Low Rural Areas, Low Pollution, Neutral AtmospheresC3 Medium Urban and Industrial atmospheres Moderate Sulfur dioxide levels Production areas with High HumidityC4 HighIndustrial & Coastal Areas Chemical Processing Plants C5I Very HighIndustrial Areas With High Humidity Aggressive Atmospheres C5M Very HighMarine, Offshore, Coastal Areas with High Salinity The environmental corrosion classifications C - 1 to C5M as shown in the table below represent the general guidelines of ISO 12944. This classification relates to the environmental exposure of organically coated products during their expected service life. The ISO 12944 standard is intended to assist engineers and corrosion experts in adopting best practice in corrosion protection of steel at new construction sites. ISO 12944 is progressively superseding regional standards to become a truly global benchmark in corrosion control. Understanding the ISO environment can help to tailor specifications, ensuring that the select coatings and processing methods are not under or over specified thus saving unnecessary cost. ISO 12944 Environmental Exposure Classification