Until recently Whatman sold white UNIFILTER 0.45um polypropylene filter plates (cat no 7700-3305), however these plates have been discontinued and I am looking for alternatives. We use them in an assay where we trap precipitated radiolabeled compounds on the filter, then add scintillation fluid and use the filter plate for scintillation counting. There are a lot of filter plates available from different suppliers however we are specifically looking for white plates to minimize “cross-talk” in the scintillation counting process. Any suggestions?