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Protective gases (according to DIN EN ISO 14175)

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Classification of process gases

SymbolComponents in volume percent (nominal)
MainUnder-oxidizinginertreducinginert
groupgroupCO2O2ArHeH2N2
I1100
2100
3Rest0.5≤He≤95
M110.5≤CO2≤5Rest0,5≤H2≤5
20.5≤CO2≤5Rest
30,5≤O2≤3Rest
40.5≤CO2≤50,5≤O2≤3Rest
M205≤CO2≤15Rest
115≤CO2≤25Rest
23≤O2≤10Rest
30.5≤CO2≤53≤O2≤10Rest
45≤CO2≤150,5≤O2≤3Rest
55≤CO2≤153≤O2≤10Rest
615≤CO2≤250,5≤O2≤3Rest
715≤CO2≤253≤O2≤10Rest
M3125≤CO2≤50Rest
210≤O2≤15Rest
325≤CO2≤502≤O2≤10Rest
45≤CO2≤2510≤O2≤15Rest
525≤CO2≤5010≤O2≤15Rest
C1100
2Rest0,5≤O2≤30
R1Rest0,5≤H2≤15
2Rest15≤H2≤50
N1100
2Rest0,5≤N2≤5
3Rest5≤N2≤50
4Rest0,5≤H2≤100,5≤N2≤5
50,5≤H2≤50Rest
O1100
ZMixed gases with components not listed in the table or mixed gases with a
Composition outside the specified ranges.

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