Corrosivity Environment - A Quick Guide

 

Are you within a subtropical or tropical zone (very high time of wetness) with an atmospheric environment consisting of very high pollution (SO2 > 250 μg/m3) including accompanying & production factors &/or strong effect of chlorides (e.g. extreme industrial areas, ocean & offshore areas, occasional contact with salt spray)?

Are you in a space with almost permanent condensation or extensive periods of exposure to extreme humidity effects &/or with high pollution from production process, e.g. unventilated sheds in humid tropical zones with penetration of outdoor pollution including airborne chlorides & corrosion-stimulating particulate matter?

Yes

Extreme Corrosivity CX

↓ No

Are you within a temperate or subtropical zone with an atmospheric environment consisting of very high pollution (90 μg/m3 < SO2 ≤ 250 μg/m3) &/or significant effect of chlorides, e.g. industrial areas, jetties & other offshore structures, within a few hundred metres of the ocean & sheltered positions on the coastline?

Are you in a space with very high frequency of condensation &/or with high pollution from production process, e.g. mines, caverns for industrial purposes, unventilated sheds in subtropical & tropical zones?

Yes

Very High Corrosivity C5

↓ No

Are you in a temperate zone with an atmospheric environment consisting of high pollution (30 μg/m3 < SO2 ≤ 90 μg/m3) or substantial effect of chlorides, e.g. less than two kilometres from polluted urban areas, industrial areas or between a few hundred metres & a kilometre of the ocean or within one hundred metres of sheltered coastal areas without spray of salt water?

Are you in a subtropical or tropical zone with an atmosphere with medium pollution?

Are you in a space with high frequency of condensation & high pollution from a production process, e.g. industrial processing plants, swimming pools?

Yes

High Corrosivity C4

↓ No

Are you in a temperate zone with an atmospheric environment with medium pollution (5 μg/m3 < SO2 ≤ 30 μg/m3) or some effect of chlorides, e.g. urban areas, between a kilometre & twenty to fifty kilometres (depending on winds & topography) from the ocean, or within one hundred metres of sheltered coastal areas with low deposition of chlorides?

Are you in a subtropical or tropical zone with an atmosphere with low pollution?

Are you in a space with moderate frequency of condensation & moderate pollution from production process, e.g. food-processing plants, laundries, breweries, dairies?

Yes

Medium Corrosivity C3

↓ No

Are you in a temperate zone with an atmospheric environment with low pollution (SO2 < 5 μg/m3), e.g. rural areas, small towns?

Are you in a dry zone with an atmospheric environment with short time of wetness, e.g. desert areas?

Are you in an unheated & un-air-conditioned space with varying temperature & relative humidity with low frequency of condensation & low pollution, e.g. storage rooms or buildings, sport halls?

Yes

Low Corrosivity C2
↓ No

Are you in a dry zone with an atmospheric environment with very low pollution & time of wetness, e.g. certain deserts?

Are you in a dry, continually heated or air-conditioned space with low relative humidity & insignificant pollution, e.g. offices, schools, museums?

Yes

Very Low Corrosivity C1

Painting Over Hot-Dip Galvanizing