30 mL centrifuge tubes are ideal for general purpose laboratory work.  These tubes are especially useful as a 95kPa certified leak-proof primary container in shipping infectious specimens. The 30 mL tube with spork is also widely used in parasitology specimen transport.  …

Superior sealing with Patented Dual α Ring Seal technology, patent number D869275 Manufactured with ultra pure gasket seal materials in caps and medical grade ultra clear USP class 6 plastics for Tubes Double Start Threads provides greater thread contact area for superior strength…

50 mL centrifuge tubes are ideal for general purpose laboratory work.  These tubes are especially useful as a 95kPa certified leak-proof primary container in shipping infectious specimens. The 50 mL tube with spork is also widely used in parasitology specimen transport.  …