Iron-containingmicroparticleshaveapolystyrenesurfacewhichallowsforpassiveadsorptionandcovalentattachment.WillrespondtoamagneticfieldandeasilyresUSPendwhenthefieldisremoved.Usefulinavarietyofapplicationsthatrequirefast,gentleseparationduringwashingandisolationprocedures.Packagedas2.5%solids(w/v)aqueoussuspensions.