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Thermo Scientific™ Nalgene™ Sealing Cap Assemblies

Process tubes at their highest rated speed level (10,000 x g or greater) without leakage, even when full with these sealing cap assemblies.

Manufacturer:  Thermo Scientific™ DS31310020

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Catalog No. 05-563-1B

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Process tubes at their highest rated speed level (10,000 x g or greater) without leakage, even when full. Thermo Scientific™ Nalgene™ Sealing Cap Assemblies include a Viton™ fluoroelastomer o-ring. Also recommended when spinning hazardous materials compatible with centrifuge tube material.



  • Top fits securely for use at maximum speeds without leakage
  • Autoclavable/biohazard/leakproof†


  • Polypropylene screw closure
  • Tefzel™ ETFE plug
  • Viton fluoroelastomer o-ring


Centrifuge Tube Cap
Closure size 20
Sealing cap assembly
20 mm
Product Certifications
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† The term “leakproof” applies to Thermo Scientific Nalgene products that meet the following criteria: a) Bottle/flask/funnel closure systems with closures smaller than 100mm, after they are filled with water, inverted, withstand air pressure of 2psig for 2 minutes, and no water escapes;. b) Bottle/funnel/flask closure systems of larger than 100mm after they are filled with water, inverted for 15 minutes, and no water escapes. Note: these tests, using other liquids, may not yield the same results. To ensure safe usage, customers are advised to test Thermo Scientific Nalgene bottles and closures under conditions of their planned applications. Thermo Scientific Nalgene products are leakproof at ambient temperature and pressure when used with their Nalgene closures.