L1 /
9
CH3041
CFC’s III
• Ozone
Depleting Potential (ODP)
All CFC’s do not have the same potential
to reduce the steady state ozone level.
All CFC’s do not have the same potential
to reduce the steady state ozone level.
• CFC-11
Lifetime 70 yr ODP 1
CFC-12 110
yr 0.86
• Halons CF2ClBr H-1211 > 1
used in fire fighting sytems for computers
used in fire fighting sytems for computers
• Du Pont & ICI new
refridgerants & propell.
CF3CH2F HFC-134a 0 CHClF2 HCFC-22 0.053
CF3CH2F HFC-134a 0 CHClF2 HCFC-22 0.053
• HFCs , HCFCs and isobutane (Germany)
CF3CH2F + OH. ® CF3CHF. + H2O ® HF, CO2
tropospheric clean up, does not get to stratosphere
CF3CH2F + OH. ® CF3CHF. + H2O ® HF, CO2
tropospheric clean up, does not get to stratosphere
