Printech Archives, March 1997: Re: fountain solution alternatives to IPA

Re: fountain solution alternatives to IPA

Robert Gifford (
Wed, 9 Apr 1997 12:27:23 CST

The following message is forwarded from Dale Kalina:

------- Forwarded Message Follows -------

My final $0.02 on the vapor pressure discussion.

Assuming water and fountain solution additives form an ideal solution,
the vapor pressure of a press ready fountain solution with a low vapor
pressure alcohol substitute will be something less than 25mm. For
example, assume a mixture of 10% asubstitute (vp = 1mm) and 90% water
(vp = 25mm). The solution vapor pressure will be (0.10)(1)+(0.90)(25)
= 22.6 mm. Since solutions are usually not ideal, this is a slight

As for the 10mm solvent, if all components are below 10 mm, the
mixture will be less than 10mm as well. If a component is above 10
mm, the mixture MAY be below 10mm, depending on the concentrations and
vapor pressures of the other constituents. The mixture vappor
pressure will not be greater than the most volatile component,




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