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Liquid Nitrogen Cold Trap

4″ Liquid Nitrogen (LN2) Cold Trap



Useful for those individuals looking to create cold traps.


  • Ideal cold trap for those that have a convenient liquid nitrogen source
  • Excellent molecule trapping capability due to -187 degree liquid Nitrogen
  • Helps achieve lower base pressure
  • High pumping speed for water vapor at the trapping surface

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SKU: Cold Trap Straight-1'OD-NW16 Categories: , , Tag:
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Product Description


Cold traps are on the “cold thimble” design. The surface of the cold thimble containing liquid nitrogen at -187°C, being exposed to the vacuum system, rapidly condenses molecules in the vapor phase. This action provides the trapping effect and cryo pumping especially for water vapor the most common condensable in vacuum systems. Pumping speed for water vapor at the trapping surface is 95 liters/sec. per sq. inch. The vapor pressure for water vapor at the cold thimble is reduced to 10-21Torr, “theoretical,” producing a low base vacuum. Other gases found in vacuum processes will be sublimated or liquefied at the cold trapping surface. This effect provides a convenient trapping or collecting mechanism.



  • Electropolished 304 Stainless Steel Construction.
  • Easily removable cold thimble.
  • Electropolished cold thimble and trap interior. Provides resistance to corrosion and superior vacuum compatibility. Reduces the effect of radiant heat on the cold surface.

Additional Information

Shipping Dimensions 18 x 18 x 6 in
Port Size

1″ O.D. Tube, NW16


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