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VWR screw-cap centrifuge tubes are supplied with 20 mm O.D. Caps that seal smoothly and completely with a single 360° turn. Tubes can be used in temperatures ranging from -86 to 110°c (-122 to 230°f), and are excellent for boiling and low temperature sample preservation. The tubes have a 16mm diameter, which is identical to standard 15 ml tubes. This ensures compatibility with existing centrifuge rotors. Tubes can withstand up to 25, 000xg. Sterile tubes are packed in rack packaging (upright in foam racks with caps attached). Nonsterile tubes are packaged in bulk, with caps unattached.