Is it true that tile and vinyl sheet flooring materials (except linoleum) can't be analyzed by PLM for asbestos?

Yes, this is true because the fiber size is too small. You can use PLM for screening tile samples. If PLM testing finds the tile to be positive then that result is acceptable. If PLM finds the results to be negative then have it tested by qualitative transmission electron microscopy. • Q: Can you compare PCM and TEM results? A: No. MACS Lab has a Technical Paper on this subject in the Client Services area. • Q: How does MACS Lab handle composite dust (wipe) samples? A: We are required to seperated each dust (wipe) sample compoiste into single samples and each single sample must be analyzed as a seperate single sample. The report must also have for each sub-sample in the composite the remarks "This sample was contaminated by other samples as it was sent in the same container with other samples" printed on the report. This is required by the AIHA. We are an accredited AIHA Lead laboratory and must follow their rules and regulations. Each wipe sample in a composite is analysed ...  more