Ok. You are talking about one specific kind of chromatography. A different kind of chromatography, often used with polymers, is size exclusion chromatography (SEC). In that case, the mobile phase is often tetrahydrofuran. Then there is reverse phase, normal phase , and ion chromatography. Then all the different column chemistries added on top of that. I'm hearing a lot of things that don't make sense. But rather than argue them, the better path would probably be to look them up on line (say with Waters or Agilent web sites), by calling a tech service line, or by reading. Good luck!