c2f6 c3f8 c4f10 c5f12 c6f14 c7f16 c8f18 carbon-dioxide carbon-tetrachloride c-c4f8 cf4 cfc113 cfc114 cfc115 cfc11eq cfc11 cfc12eq cfc12 ch2cl2 ch3ccl3 chcl3 halon1211 halon1301 halon2402 hcfc141b hcfc142b hcfc22 hfc125 hfc134aeq hfc134a hfc143a hfc152a hfc227ea hfc236fa hfc23 hfc245fa hfc32 hfc365mfc hfc4310mee methane methyl-bromide methyl-chloride nf3 nitrous-oxide sf6 so2f2