What is the primary characteristic of CFC refrigerants?

The primary characteristic of CFC (chlorofluorocarbon) refrigerants is that they deplete the ozone layer. CFCs were widely used in refrigeration and air conditioning systems due to their stability, non-flammability, and non-toxic properties. However, it was discovered that when CFCs are released into the atmosphere, they eventually reach the stratosphere, where they are broken down by ultraviolet radiation, releasing chlorine atoms. These chlorine atoms significantly contribute to the destruction of ozone molecules, leading to a thinner ozone layer, which ultimately results in increased ultraviolet radiation reaching the Earth's surface.

This characteristic of ozone depletion has led to international agreements like the Montreal Protocol, which aims to phase out the use of CFCs and other ozone-depleting substances. Understanding this property is crucial for anyone working in refrigeration or related fields, as it highlights the importance of using alternative refrigerants that are less harmful to the environment.