Day 011 - 12 Jul 94 - Page 45


     
     1        the way the numbers went did have some relationship to
              where the chlorine atoms were attached in the chemical
     2        framework, so it was not a completely random numbering
              choice.
     3
         Q.   No.  I was going to move on to that.  For example, CFC-11,
     4        as we call it, should in reality really be called CFC-011?
              A.  Yes.
     5
         Q.   That is right?
     6        A.  Yes.
 
     7   Q.   The first digit is one less than the number of carbon
              atoms in the molecule?
     8        A.  Yes.
 
     9   Q.   The second digit is one more than the number of hydrogen
              atoms?
    10        A.  Yes.
 
    11   Q.   The third digit is the number of fluorine atoms?
              A.  Yes.
    12
         Q.   That all the other atoms in the molecule are chlorine?
    13        A.  Yes.
 
    14   Q.   Generally, if there was only one carbon atom in the
              molecule, this means the first digit is a zero and so it
    15        is frequently omitted?
              A.  Yes.
    16
         Q.   That is where you get CFC-11 rather than 011?
    17        A.  Yes.
 
    18   Q.   Would it be fair to say that CFCs are basically
              hydrocarbons where some or all of the hydrogen atoms have
    19        been replaced by fluorine and/or chlorine?
              A.  I think it would be fairest to say that CFCs, as now
    20        understood, are hydrocarbons where all the hydrogen atoms
              have been replaced by either chlorine, by one of the
    21        halogens and, in fact, normally would be chlorine or
              fluorine.
    22
         Q.   Could you just say that last part again?
    23        A.  Yes, as in the current usage of the term CFC, it is a
              hydrocarbon where all of the hydrogen atoms have been
    24        replaced by either fluorine or chlorine which means, for
              example, that carbon tetrachloride would not be classed as
    25        a CFC because it contains no fluorine.
  
    26   Q.   What about the previous naming system?  Would that have 
              come under the umbrella of CFCs previously? 
    27        A.  Yes, it would.
 
    28   Q.   Would it be fair to say that, basically, the three digit
              numbering system takes into consideration the number of
    29        hydrogen atoms remaining?
              A.  Yes.
    30
         Q.   I.e. the second digit relates to hydrogen, so there is a

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