Airborne residual dust must have a deliquescent point less than 60 percent relative humidity. The
deliquescent point is the relative humidity at which crystalline materials begin adsorbing large
quantities of water from the atmosphere.
Gaseous corrosion level in terms of (in Angstrom) as per ISA:
l
Copper reactivity rate must be less than 300 A/month, class G1(ANSI/ISA71.04-1985).
l
Silver reactivity rate must be less than 200 A/month (AHSRAE TC9.9).
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