Unlike other filter types that contain additives that can inhibit enzymatic reactions, Rainin filter tips are made from pure virgin sintered polyethylene. Hydrophobic polyethylene particles prevent aerosols and liquids from being aspirated into the body of the pipette.
They are certified free of RNase, DNase, DNA, and pyrogen contamination. In addition, all filter tips are presterilized by radiation after packaging as added protection for biological samples.