FFFractionation, is your source of field-flow fractionation (FFF) instruments which provide high resolution separation and size analysis of sample species in the range of 10,000 Daltons or a few nanometers up to 100 microns. Our latest applications include separation of protein and protein aggregates, separation and quantitation of the sub-classes of lipoprotein species, resolution of bimodal latex populations, and analysis of the microgel content in polymer matrices. We now also offer SPLITT (split flow thin cells) systems for preparative fractionation of micron sized particles, including removal of over- or under-sized particles, and preparation of narrow size cuts.