Fluorinated gases (F-gases) are chemical compounds containing fluorine that are gases near room temperature.

Types of F-gases

The most common F-gases are hydrofluorocarbons (HFCs), which contain hydrogen, fluorine, and carbon. They are used in a multitude of applications including commercial refrigeration, industrial refrigeration, air-conditioning systems,

heat pump A heat pump is a device that can heat a building (or part of a building) by transferring thermal energy from the outside using a refrigeration cycle. Many heat pumps can also operate in the opposite direction, cooling the building by removing ...

equipment, and as blowing agents for foams, fire extinguishants, aerosol propellants, and solvents. HFC-134a ( 1,1,1,2-Tetrafluoroethane) has grown to become the most abundant HFC in earth's atmosphere as of year 2015. Perfluorocarbons (PFCs) are the compounds consisting of fluorine and carbon. They are widely used in the electronics, cosmetics, and pharmaceutical industries, as well as in refrigeration when combined with other gases. PFCs were commonly used as fire extinguishants in the past and are still found in older fire protection systems. They are also a by-product of the aluminium smelting process. PFC-14 ( Carbon tetrafluoride - CF₄) has grown to become the most abundant PFC in earth's atmosphere as of year 2015. Sulphur hexafluoride (SF₆) is used primarily as an

arc suppression Arc suppression is the reduction of sparks formed when current-carrying contacts are separated. The spark is a luminous discharge of highly energized electrons and ions, and is an electric arc. Uses There are several possible areas of use of arc s ...

and insulation gas. It can be found in high-voltage switchgear and is used in the production of magnesium. Nitrogen trifluoride (NF₃) is used primarily as an etchant for microelectronics fabrication.

Use history

HFCs were developed in the 1990s to substitute for substances such as chlorofluorocarbons (CFCs) and hydrochlorofluorocarbons (HCFCs). As these substances were found to deplete the ozone layer, the

Montreal Protocol The Montreal Protocol is an international treaty designed to protect the ozone layer by phasing out the production of numerous substances that are responsible for ozone depletion. It was agreed on 16 September 1987, and entered into force ...

began to lay down provisions for them to be phased-out globally after the agreement was ratified in 1987. PFCs and SF₆ were already in use prior to the Montreal Protocol. NF₃ use has grown since the 1990s along with the rapid expansion of the microelectronics fabrication industry.

Environmental impact of F-gases

F-gases are ozone-friendly, enable energy efficiency, and are relatively safe for use by the public due to their low levels of toxicity and flammability. However, most F-gases have a high global warming potential (GWP), and some are nearly inert to removal by chemical processes. If released, HFCs stay in the atmosphere for decades and both PFCs and SF₆ can stay in the atmosphere for millennia. The total atmospheric concentration of F-gases, CFCs, and HCFCs has grown rapidly since the mid-twentieth century; a time which marks the start of their production and use at industrial scale. As a group in year 2019, these unnatural man-made gases are responsible for about one-tenth of the direct

radiative forcing Radiative forcing (or climate forcing) is the change in energy flux in the atmosphere caused by natural or anthropogenic factors of climate change as measured by watts / metre2. It is a scientific concept used to quantify and compare the extern ...

from all long-lived anthropogenic greenhouse gases. F-gases are used in a number of applications intended for climate change mitigation, that can generate further positive feedback for atmospheric heating. For example, refrigeration and air conditioning systems are increasingly utilized by humans within a warming environment. Likewise, expansions of electrical infrastructure, as driven by the alternatives to fossil fuels, has led to rising demand for SF₆. If recent trends of aggressive (5% and greater

CAGR Compound annual growth rate (CAGR) is a business and investing specific term for the geometric progression ratio that provides a constant rate of return over the time period. CAGR is not an accounting term, but it is often used to describe some ele ...

) annual growth for such types of F-gas production were to continue into the future without complimentary reductions in GWP and/or atmospheric leakage, their warming influence could soon rival those of CO₂ and CH₄ which are trending at less than about 2% annual growth.

Regulation of F-gases

International level

Although the Montreal Protocol regulates the phasing out of HCFCs, there was no international agreement on the regulation of HFCs until late 2016 when the Kigali Agreement under the Montreal Protocol was signed, which has put compulsory phase wise phasing out of CFC gases. Efforts are ongoing to develop a global approach for the control of HFCs. Most recently, this has taken the form of a declaration of support for a global phase-down on as part of the outcomes of the "Rio+20" United Nations Conference on Sustainable Development.

US-level

In the United States, the regulation of F-gases falls under the authority of the Environmental Protection Agency's overall attempts to combat greenhouse gases. The United States has put forward a joint proposal with

Mexico Mexico (Spanish language, Spanish: México), officially the United Mexican States, is a List of sovereign states, country in the southern portion of North America. It is borders of Mexico, bordered to the north by the United States; to the so ...

and the

Federated States of Micronesia The Federated States of Micronesia (; abbreviated FSM) is an island country in Oceania. It consists of four states from west to east, Yap, Chuuk, Pohnpei and Kosraethat are spread across the western Pacific. Together, the states compr ...

for a phase-down of HFCs by 2030.

EU-level regulation

In order to combat the potential global warming effects of F-gases, and as part of the EU's Kyoto protocol commitments, in 2006 the European Union passed two pieces of legislation controlling their use: th
F-gas Regulation (EC) No 842/2006
and the Mobile Air Conditioning Directiv
Directive 2006/40/EC
The F-gas Regulation adopts an approach based on containment and recovery of F-gases as well as imposing obligations on reporting, training and labeling on those using F-gases. On 26 September 2011, the Commission issued
report
on the application, effects and adequacy of the Regulation, drawing from the results of an analytica
study
it commissioned from German environmental research institute, Öko-Recherche. A furthe
study
conducted by the Armines Centre energétique et procédés and by Energy Research Innovation Engineering (ERIE) found that emissions reductions of up to 60% can be achieved by improving containment measures and accelerating the changeover from high GWP refrigerants to ones with lower GWP. On 7 November 2012, the European Commission published th
proposal
to revise the F-gas Regulation. In December 2013, the European Parliament and the Council of the EU agreed th
text of the revised regulation
which shall be applied from 1 January 2015.

References

{{reflist