Dewar Precautions

  Always handle glass dewars with care. Any product incorporating a vacuum is a potential safety hazard and should be treated with caution. If in doubt, contact your safety officer.

Do not pour liquid nitrogen directly into a sink. Doing so may cause drain pipes to burst.

When handling dewars containing liquefied gases or cryogenic liquids:

  • Wear protective equipment:
    • goggles or face shield
    • an insulated or rubber apron
    • insulated gloves
  • When pouring liquefied gases from one container to another:
    • cool the receiving container gradually to minimize thermal shock
    • pour the liquified gas slowly to prevent splashing
    • vent the receiving container to the atmosphere

For glass dewars

  • Use a plastic stirring rod when stirring substances in a dewar containing liquefied gases (or other materials of extremely low temperature). Do not use a glass or metal stirring rod unless it has a protective coating.
  • Do not handle heavy objects above the dewar. If unavoidable, place a protective cover over the dewar opening. If an object of sufficient weight is accidentally dropped into the dewar, shattering may occur.
  • If the dewar has a protective mesh covering, do not remove it. This cover minimizes the risk of flying particles should the dewar be knocked over, dropped, or broken.
 
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