Zinc-Aluminum-Magnesium Alloy Coated Steel Coil

indoor

outdoor

C1

very low

Dry and clean indoor venues such as offices, schools, museums

Atmospheric environments with dry and cold regions, extremely low pollution, and wet times, such as certain deserts, Arctic, Antarctic

C2

low

Indoor venues with low-frequency condensation and low pollution, such as warehouses and stadiums

Atmospheric environment with temperate zone and low pollutant concentration (SO2≤ 5μg/m3), such as villages and small towns

Atmospheric environments with dry and cold regions and short wetting times, such as deserts and subarctic regions

C3

medium

Sites with intermediate frequency condensation and moderate pollution during product production, such as food processing plants, laundry rooms, breweries, and dairy plants

The temperate zone, medium pollutant concentration (5μg/m3≤SO2≤30μg/m3), or low-salinity atmospheric environments, such as cities, or low-salinity coastal areas.

Subtropical and tropical regions, low-pollution atmospheric environment.

C4

high

Sites with high-frequency condensation and heavy pollution during product production, such as industrial processing plants and swimming pools

Temperate zones, high pollutant concentration (30μg/m3≤SO2≤90μg/m3), or high salinity atmospheric environments, such as heavily polluted cities, industrial areas, moderate salinity coastal areas, or areas exposed to deicing salt.

Subtropical and tropical regions, a moderately polluted atmospheric environment

C5

very high

Sites with extremely high-frequency condensation and heavy pollution during product production, such as mines, industrial caves, and unventilated workshops in subtropical and tropical areas

Temperate and subtropical, extremely high pollutant concentration (90μg/m3≤SO2≤250μg/m3) or extremely high salinity atmospheric environment, such as industrial areas, seaside areas, and coastal shelters.

CX

extreme

Continuous condensation during product production or long-term exposure to high-humidity environments and heavily polluted sites, such as unventilated workplaces with outdoor pollutants entering the humid tropics

Subtropical and tropical (very high wetting time), extremely high pollutant concentration (250μg/m3≤SO2) and extremely high salinity atmospheric environment, such as extreme industrial areas, coastal areas, and offshore areas, occasional exposure to salt spray.