Scott's idea for localizing the problem is real good, however please please
please do not condemn all surfactants because one is giving you problems.
 And in fact, it may not be the surfactant at all.

On the subject of roller material:  This is so very very difficult to
discuss, because there is no such thing as "EPDM", or Polypropylene", or
.....   All these various plastics can vary in composition, ESPECIALLY EPDM,
but more importantly they can vary in fillers.  All the plastics contain
inorganic fillers for color, strength, cheepness, etc.  They also contain
plasticizers, to make the plastic flexible, or soft, and these puppies are
much too often the culprit.

In theory, Polypropylene is resistant to ANY CHEMICAL at temperatures below
about 150 F, but the plasticizers, most of which are from the class of
organics called "esters", can be a big problem, especially in strong alkaline
solutions.

So the bad news is, that you cannot a whole class of plastics just because
one of them made your life miserable.  It is this sort of variable that gives
us all gray hair.

Rudy Sedlak
RD Chemical Company

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