13.5.2   Gases in industrial centers
Absolute cleanliness with regard to air pollution is required in warehouses and containers which are to be packed. Hydrogen sulfide H2S) in particular is one of the most frequent causes of damage to machinery, electronic equipment and other industrial products in many of the world's industrial zones and ports.
Hydrogen sulfide reacts with silver to form silver sulfide (Ag2S), which results in the formation of a black film of insulating sulfides on the surface of silvered contacts and relays and on silvered conductors (e.g. coils).
Sulfur dioxide (SO2) and sulfur trioxide (SO3) also have a corrosion-promoting action if these gases are dissolved in mist droplets; combined with water, they form H2SO3 or H2SO4. For data processing hardware, the maximum admissible level for SO2 is 1 mg/m³ of air.

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