SPI-Chem™ Embedding Resin Kits
Off-gassing of resin blocks and their potential to contaminate and
electron microscope column
One of the several main sources of column contamination is from the resins
used for the embedment of the samples. In the case of a TEM, we are usually
talking about thin sections but for SEMs, usually the entire block. The
problem of contamination can be especially critical for one making use of a
FESEM, which must be operating in a relatively clean vacuum system.
While nothing can change the fact that the resins are all organic materials
and therefore they all have the potential to contaminate, we believe that if
the following considerations are followed, then the amount of contamination
introduced this way, to the column can truly be minimized:
- Thorough mixing of the resin components is absolutely critical.
Otherwise there will be volumes or pockets of incompletely cured resin and
this will pose a very difficult situation in terms of column cleanliness.
- Since it would not harm most samples, a 60° C "bakeout" of several
hours could help cure to completeness any unreacted monomer, thereby
eliminating that as a source for off-gassing species.
- Do a twenty four hour pump down on all samples before entering the
vacuum of the microscope.
Such procedures do not eliminate contamination completely, but they do tend
to reduce the problem to more manageable levels.
To Ask a Question or Make a Comment
To Place an Order or Request a Quote
Return to:
Saturday March 20, 2010
© Copyright 2000 - 2010. By Structure Probe, Inc.
Contacting SPI Supplies and Structure Probe, Inc.
All rights reserved.
All trademarks and trade names are the property of their respective owners.
Privacy Policy
Worldwide Distributors, Representatives, and Agents
