The GPC analysis is pretty straightforward, using either THF or methylene chloride as the eluent. We decided to see how good the precision was for the Alliance system by doing something a little different. We had a series of polycarbonates that we ran GPC analysis on Alliance system in Milford, and had the same samples run on an Alliance system at a Waters site outside the U.S., with even a slightly different column set. Shown below are the amazing agreement obtained between the two lab sites.

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