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 *************************************************************************** * TechNet mail list is provided as a service by IPC using SmartList v3.05 * *************************************************************************** * To unsubscribe from this list at any time, send a message to: * * [log in to unmask] with <subject: unsubscribe> and no text. * *************************************************************************** * If you are having a problem with the IPC TechNet forum please contact * * Dmitriy Sklyar at 847-509-9700 ext. 311 or email at [log in to unmask] * ***************************************************************************