The TEM CHATFIELD method is a specialized procedure used for determining asbestos content in challenging organically bound bulk samples. This method is particularly useful when dealing with materials where asbestos, if present, is tightly bound to the matrix material, making it difficult to isolate and detect through microscopy.

Applicability of the TEM CHATFIELD Method

The TEM CHATFIELD method is most effective when applied to materials classified as Non-friable Organically Bound (NOB). These materials are not conducive to asbestos analysis due to the nature of their composition. Some examples of NOB materials include:

  • Floor tiles (vinyl and asphalt)
  • Roofing Materials
  • Mastics
  • Caulking

Comparison with Other Methods

While the TEM CHATFIELD method shares similarities with New York State's method 198.4, there are differences that may make one method preferable over the other depending on the circumstances. For instance, we recommends the New York 198.4 method over the Chatfield method as it is a promulgated method.


In conclusion, the TEM CHATFIELD method provides a valuable tool for asbestos testing in NOB materials where traditional methods may fall short. However, it's important to consider the specific requirements and circumstances of each testing scenario to determine the most suitable method.


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