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Full Limit Criteria


  • 250°F is the maximum temperature to which a UF6 cylinder will be heated

  • The weight of a cubic foot of 250°F liquid UF6 is 203.3 lb.

  • The weight of a cubic foot of 80°F solid UF6 is 317.8 lb.

  • Allowance of 5% of certified minimum volume is made for ullage in cylinder.
When heated, uranium hexafluoride expands and undergoes a phase change from a solid to a liquid. Fill limits ensure that cylinders do not rupture by requiring a 5% void space when the cylinders are heated to the maximum temperature of 250°F.

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