Tubes are graduated, with white writing area. Manufactured from non-toxic polypropylene. The vial has external threads, providing a smooth and uniform inner surface, thus reducing the risk of contamination. Tubes can be autoclaved (121°C) in upright position with caps loosened. Height of tube is with cap.
Caps must be ordered separately. Caps are available either without O-ring or with a silicone seal between the cap and the tube to ensure a positive leakproof seal at all temperatures. Like the tubes, the closures are also made of polypropylene, assuring the same coefficient of expansion for both, which further enhances the leakproof qualities of the vials at changing temperatures. The cap features a long skirt and a super-fast thread design that permits it to be removed or sealed with a single turn.