Freon-12, also known as dichlorodifluoromethane (CFC-12), was historically manufactured by reacting carbon tetrachloride with hydrogen fluoride. However, due to environmental concerns, its production has been largely phased out. Freons, including Freon-12, were commonly used in industrial applications as refrigerants in air conditioning and refrigeration systems. Their low boiling points and heat-absorbing properties made them effective in heat transfer. They were also used as propellants in aerosol products. In modern times, the use of Freon-12 has decreased significantly due to its ozone-depleting potential, and alternative, environmentally friendly refrigerants have been adopted in many applications.