Hydrogen sulfide, often called H2S or sour gas, is a colorless, highly toxic gas with a characteristic rotten egg odor commonly encountered in petroleum refining, wastewater treatment, and metal processing. In wet, cold environments, the presence of moisture can increase corrosion and affect sealing materials. When evaluating chemical compatibility, O-rings, rubber seals, gaskets, and plastic components must be carefully selected to resist degradation in wet hydrogen sulfide service. Proper ventilation, gas detection, handling procedures, and protective equipment are essential to minimize exposure risks and maintain safe operation.

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