Carbon dioxide, also known as CO2 or carbonic acid gas in certain contexts, is a colorless, odorless gas widely used in beverage carbonation, refrigeration systems, fire suppression equipment, and industrial processing. In chemical compatibility evaluations, carbon dioxide exposure, particularly under pressure or in supercritical CO2 conditions, should be reviewed for rubber O-rings and gaskets, as rapid decompression can affect certain rubber materials. While CO2 is generally non-toxic at low concentrations, elevated levels may displace oxygen and pose an asphyxiation hazard. Proper storage, ventilation, and material selection are important to ensure safe operation and reliable performance of O-rings, rubber seals, and gaskets.

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