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Ideal for storage of biological materials, our polypropylene tube with high density polyethylene (HDPE) cap has an incredibly secure 2-turn closure that includes an external thread.  Specifically designed to remove the risk of trapping sample on the inner wall.  The difference in hardness between the tube and cap coupled with the caps molded in sealing ring forms a leak resistant seal.  When used in apporpriate storage racks, tubes are easily opened or closed with one-handed operation. Tubes are graduated in .5ml increments and have a frosted writing area.  Non-sterile tubes are packaged seperately from caps. Sterile tubes are packaged with caps to ensure the sterile environment is maintained within the tube even after the package is opened. Caps are not autoclavable.