View Cart || Request a 2021 Catalog

Electron Microscopy Sciences

Technical Data Sheets

Vacuum Desiccators

EMS Catalog #71230, 71232, 71234

These vacuum desiccators are made from clear polycarbonate. Its stopcock body is made from polypropylene and the plug and washer are made from PTFE. The O-ring is made from neoprene.

Warnings for Safe Operation

  • Do not Autoclave
  • Do not use below 0°C (32°F)
  • Do not use above 41°C (105°F)
  • Do not place near any heating device
  • Do not place in front of heating or air conditioning ducts
  • Do not use concentrated acids as a desiccant
  • Do not use with organic solvents, as organic solvents and their vapors may attack the polycarbonate material and cause hairline cracking (crazing) of the surface

Instructions for Use

Before Use

Unpack the item and check for any damages. If dirty, be sure to wipe the O-ring clean and re-seat in the groove which is located in the flange on the base. Vacuum grease is not necessary to hold full vacuum for 24 hours. If the desiccator is to be held under vacuum for more than 24 hours, you can apply vacuum grease to the O-ring flanges and stopcock valve tapers.


  1. Press the stopcock onto the tapered outlet located on the dome and twist slightly to set the plug.
  2. Connect a vacuum source tube to the serrated arm on the stopcock (use ¼" to 5/16" or 6 to 8 mm inside diameter tubing).
    Note: The arrows on the red plug show the orientation in the 3-way stopcock plug. If the vacuum source needs to be removed with a vacuum held in the desiccator, the third stopcock port must be sealed at the same time that the plug is being turned. We recommend using the small red tapered port closure to do this.

Releasing the vacuum in the desiccator

  1. Unplug the third stopcock port.
  2. Turn the handle very slowly to open the desiccator to the atmosphere.
    Note: This should allow the air to enter the desiccator very slowly to avoid disturbing the contents.

Product Information

Vacuum Desiccators