Sampling

Sampling and analysis of suspect material is the only way to verify the presence of asbestos.  It is important to sample all suspect material and have it analysed.

Samples should be taken of all suspect friable material.  Whatever method is used, it is important that a representative sample be taken.  Any change in the appearance, texture or colour of the material will necessitate additional samples being taken.  For multi-storey buildings, at least one sample should be taken per floor.  Samples taken should be adequately labeled for follow-up action.  For example, the name and location of the sampled material, date of sampling and a batch identification number should be recorded.

Analysis

Once obtained, the samples will be analysed.  Three methods for identifying asbestos currently exist; Polarised light microscopy (PLM), X-ray diffraction (XRD), and Electron Microscopy (EM).  The PLM method is preferred.

It is important that the analysis be performed by a competent laboratory to ensure accurate results.  False results could lead to expensive removal or allow an existing risk to remain.

Sampling and analysis of the suspect material is the only acceptable method of identifying the presence or absence of asbestos, i.e. air monitoring to determine the presence of asbestos is not acceptable by itself.  Suspect material should be treated as if it contains asbestos, until the results of the analysis are available.