For 2 - 6mL samples, the Vivaspin 6mL concentrators have been developed to offer increased volume flexibility and performance. Vivaspin 6 can process an impressive 6mL in either swing bucket or fixed angle rotors accepting standard 15mL conical bottom test tubes. It features twin vertical membranes for unparalleled filtration speeds and 100x plus concentrations. Remaining volume is easy to read off the printed scale on the side of the concentrator and the modified dead stop pocket further simplifies direct pipet recovery of the final concentrate. Polyethersulfone membrane.