This series of tubes is also available either plain or with printed graduations and white marking area for sample identification. O-ring seal screw caps are unattached but incorporate a flat top which provides a writing surface. These flat surfaced caps can be used with automatic capping machines in packaging industries. Closures are supplied in natural color. Perfect for cryogenic work. Non skirted tubes can be centrifuged up to 20,000g. Will withstand temperatures from -196 ° C to +121 ° C. With o-ring seal and flat top.
