The contents of CO2 tanks can be dangerous, especially when they make contact with skin. All CO2 tanks and cartridges come with warnings about taking necessary measures to prevent an accident.
Temperature Warnings
When dealing with a CO2 tank, know what temperature the cylinder will be exposed to. When a tank is exposed to high temperatures, the risk of injury increases. CO2 tanks should never be used at temperatures exceeding 120 degrees Fahrenheit. When the temperature increases, the CO2 charge expands, causing pressure to increase. If the pressure exceeds the tank's limit, the gas will leak out of the safety valve. If you come into contact with the gas, your skin can be damaged.
Overfilling
A CO2 tank is filled up 65 percent of the way with liquid. When the CO2 is expended, it turns to gas and the extra space is needed to accommodate the gas. When a tank is even slightly overfilled, the maximum temperatures it can be exposed to decreases. For example, if a tank can be exposed to a temperature of 100 degrees Fahrenheit at normal conditions, when overfilled, the maximum temperature can go down to 90 degrees. When this pressure builds up, it leaks out of the safety valve, and accidents can occur.
Flammable
CO2 is combustible. When the pressure exceeds the maximum allowed and gas leaks out of the safety valve, the threat of an explosion exists. Always be aware of the conditions your tank is around.
