0.5 mL, O-ring less Screwcap Tube, Self-standing, attached Natural Cap, Sterilized "1394-050-SS-CS" (20 tubes x 25 bags)

Double-sealed design, Leak-less even without O-ring Material: Virgin Polypropylene（tube）　　 Polyethylene（cap）   Two sealing points provide high airtightness A：1st sealing pointB：2nd sealing point 1st sealing point where the protruding part is located inside of the cap makes the clearance between the cap and the body seal. By fully tightening the cap, 2nd sealing point makes both upper and main body seal completely seal, resulting in preventing test sample leakage and evaporation.   The part where the protrusion of the cap matches the tube body by tightening is "1st sealing point". Tightening 1st sealing point is essential.Extra tightening up to about 180° where 2nd sealing point is located is capable of high sealing performance. *The bottom portion of thread on the tube body appear.     Durable for centrifugal force 17,000 x G*Our originally designed tube using 100% virgin medical-grade polypropylene proves resistance against a centrifugal force as high as 17,000 x G (Water, 15 min,