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Gaseous
Copper Reactivity
Corrosivity
Level
Level
G2 (moderate)
< 1000 Å/month
G3 (harsh)
< 2000 Å/month
GX (severe)
≥ 2000 Å/month
See the table below for the requirements on the copper and silver corrosion rates.
Table 8-8 Concentration Limitation on Corrosive Airborne Contaminants in a Data
Center
Group
Corrosive Gas
H
S
2
SO
2
Group A
Cl
2
NO
2
Group B
HF
Silver Reactivity
Level
< 1000 Å/month
< 2000 Å/month
≥ 2000 Å/month
Unit
Concentration
ppb
< 3
a
ppb
< 10
ppb
< 1
ppb
< 50
ppb
< 1
59
Description
controlled such that
corrosion is not a
factor in determining
equipment reliability.
An environment in
which the effects of
corrosion are
measurable and may
be a factor in
determining
equipment reliability.
An environment in
which there is high
probability that a
corrosive attack will
occur.
An environment in
which only specially
designed and
packaged equipment
would be expected to
survive.
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