What should never be used to lubricate a gas cylinder or regulator?

Using oil or grease to lubricate a gas cylinder or regulator is particularly dangerous because these substances can react explosively with certain medical gases, especially oxygen. When oxygen comes into contact with hydrocarbons found in oils and greases, it can lead to rapid combustion or even explosions due to the increased reactivity of these substances in an oxygen-rich environment. This risk is why it is crucial to avoid any form of lubrication that may contain oils or greases in the context of gas cylinders and regulators.

Petroleum jelly, while similar in composition to oils and could pose similar risks, is specifically categorized under the broader warning against oils and grease. Water, while not dangerous in the same way, does not provide lubrication benefits and could lead to rust or damage to equipment. Silicone spray could potentially be safer than oils, but it is still essential to follow manufacturer recommendations and protocols regarding safe lubrication practices. Thus, using any kind of oil or grease is universally discouraged to ensure safety when handling medical gas cylinders.