<P> One of the natural refrigerants (along with ammonia and carbon dioxide), hydrocarbons have negligible environmental impacts and are also used worldwide in domestic and commercial refrigeration applications, and are becoming available in new split system air conditioners . Various other solvents and methods have replaced the use of CFCs in laboratory analytics . </P> <P> In Metered - dose inhalers (MDI), a non-ozone effecting substitute was developed as a propellant, known as "hydrofluoroalkane ." </P> <Table> <Tr> <Th_colspan="3"> Applications and replacements for CFCs </Th> </Tr> <Tr> <Th> Application </Th> <Th> Previously used CFC </Th> <Th> Replacement </Th> </Tr> <Tr> <Td> Refrigeration & air - conditioning </Td> <Td> CFC - 12 (CCl F); CFC - 11 (CCl F); CFC - 13 (CClF); HCFC - 22 (CHClF); CFC - 113 (Cl FCCClF); CFC - 114 (CClF CClF); CFC - 115 (CF CClF); </Td> <Td> HFC - 23 (CHF); HFC - 134a (CF CFH); HFC - 507 (a 1: 1 azeotropic mixture of HFC 125 (CF CHF2) and HFC - 143a (CF CH)); HFC 410 (a 1: 1 azeotropic mixture of HFC - 32 (CF H) and HFC - 125 (CF CF H)) </Td> </Tr> <Tr> <Td> Propellants in medicinal aerosols </Td> <Td> CFC - 114 (CClF CClF) </Td> <Td> HFC - 134a (CF CFH); HFC - 227ea (CF CHFCF) </Td> </Tr> <Tr> <Td> Blowing agents for foams </Td> <Td> CFC - 11 (CCl F); CFC 113 (Cl FCCClF); HCFC - 141b (CCl FCH) </Td> <Td> HFC - 245fa (CF CH CHF); HFC - 365 mfc (CF CH CF CH) </Td> </Tr> <Tr> <Td> Solvents, degreasing agents, cleaning agents </Td> <Td> CFC - 11 (CCl F); CFC - 113 (CCl FCClF) </Td> <Td> None </Td> </Tr> </Table> <Tr> <Th_colspan="3"> Applications and replacements for CFCs </Th> </Tr>

Instead of using cfc what products could be used as substitutes
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