Electron microscopy
O-Rings in EMs
- Practical Electron Microscopy and Database -
- An Online Book -
Microanalysis | EM Book                                                                                   https://www.globalsino.com/EM/        

This book (Practical Electron Microscopy and Database) is a reference for TEM and SEM students, operators, engineers, technicians, managers, and researchers.


In general, contamination of aperture surfaces is normally originated from deposition of organic compounds. The contamination sources are:
        i) Vacuum pump oil used in the pumping system.
        ii) Gaskets.
        iii) O-rings used to seal the vacuum system.
        iv) Greases used to lubricate O-rings.
        v) Specimen itself.

To reduce specimen contamination, viton O-rings and apiezon grease should be employed instead of silicon grease for vacuum seals.



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