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[Max Heim]

No. We are talking about ZDDP as a compound, not about the individual atoms
of zinc and phosphorus. I don't know the actual chemical formula for ZDDP ,
so let's use a simple example -- CO2, carbon dioxide, expressed as PPM in
the atmosphere.

Each molecule of CO2 contains one carbon atom and 2 oxygen atoms. So, if
there is, say, 1000ppm of carbon dioxide in a mixed gas, you could also say
there is 1000ppm of carbon, or 2000ppm of oxygen. But you don't add the
carbon and the oxygen to get 3000ppm of CO2 -- it's 1000ppm for the entire
molecule of the compound.


--

Max Heim
'66 MGB GHN3L76149
If you're near Mountain View, CA,
it's the primer red one with chrome wires




on 6/23/09 12:59 AM, Paul Hunt at paul.hunt1 at blueyonder.co.uk wrote:

> But the 'million' refers to the final result.  Yes I agree that if you add a
> dilution of 1300ppm to another dilution of 1300ppm, of the same product or
> different it doesn't matter, you still have a dilution of 1300ppm, because you
> now have double the quantity of final product you had before.  But if you take
> a given quantity of a mixture of chemicals, each with its own ppm dilution,
> they are each expressed as a proportion of the total mixture, so they must all
> add up to a million parts per million in the final result.  Is that not so?
> 
> PaulH.
>   ----- Original Message -----
> 
> 
>   No, that is improper chemistry. 1300ppm zinc plus 1300ppm phosphorus doesn't
>   equal 2600ppm of the compound -- if they are in equal proportions, it would
>   still be 1300ppm of ZDDP.