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NanoFab Tool: Tousimis Autosamdri-815 Series B

Photograph of the Tousimis Autosamdri-815 Series B critical point dryer.
Photograph of the Tousimis Autosamdri-815 Series B critical point dryer.

The Tousimis Supercritical Autosamdri-815 Series B critical point dryer utilizes liquid carbon dioxide (LCO2) to dry substrates in a controlled manner in order to release suspended and floating structures on microelectromechanical systems. The critical point dryer uses high temperature and pressure to transition from liquid to gas without crossing a phase boundary, thereby removing the surface tension between the sample and the surrounding liquid. It can accommodate substrates ranging from 25 mm diameter wafers down to small pieces.


  • Small sample chamber allows quick drying time.
  • Chamber illumination with viewing window to monitor processes.
  • Automatic processing for repeatable results.
  • High pressure LCO2 used as drying fluid.

Usage Information

Supported Sample Sizes

  • Maximum wafer diameter: 25 mm (1 in).
  • Small pieces supported: Yes.

Typical Applications

  • Microelectromechanical systems (MEMS).
  • Drying suspended and floating structures. 
  • Nondestructive drying of membranes.
Created June 20, 2014, Updated February 24, 2023