Stratospheric Ozone Depletion
Stratospheric Ozone Depletion
Stratospheric Ozone Depletion
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Numbering system for CFCs and HCFCs<br />
CFC-XYZ<br />
1) Z = number of fluorine atoms.<br />
2) Y =1 + number of hydrogen atoms.<br />
3) X = number of carbon atoms -1<br />
When X=0 (i.e., only one carbon compound), it is omitted.<br />
4) The number of chlorine atoms in the compound is found by<br />
subtracting the sum of fluorine and hydrogen atoms from the<br />
total number of atoms that can be connected to the carbon<br />
atoms.<br />
5) Examples:<br />
CCl2F2 (CFC-12, refrigerant)<br />
CCl3F (CFC-11, blowing agent)<br />
CHClF2 (CFC-22, refrigerant, blowing agent)<br />
C2Cl2F4 (CFC-114)
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