PYREX® disposable glass centrifuge tubes are manufactured from Type I borosilicate glass. They are available in four sizes: 5, 10, 15 and 50mL and in two styles: either threaded for disposable phenolic screw caps or with a tooled rim for secure snap cap sealing. These tubes feature more consistent uniform wall thickness, a well-formed conical tapered tip and durable tip radius. The optimally shaped tip design allows for easy removal of samples following centrifugation. The tubes are designed to withstand centrifugation up to 3,000 RCF and are packed in convenient, easy to use packs, which are shrink-sealed for protection during shipment. The Corning orange polyethylene snap caps are manufactured to rigorous standards to ensure a leak proof seal. For screw caps, select either disposable phenolic caps with rubber liners or reusable screw caps with PTFE liners for improved chemical resistance.