Polarized Light Microscopy (PLM)
The focus of our PLM laboratory services is qualitative asbestos identification in bulk samples of building materials. These samples may include, but are not limited to thermal system insulation, ceiling tile, wall textures, plasters, gypsum wall boards, insulation, tape joints, floor tiles, sheet vinyl and mastics. All samples are first stereoscopically analyzed to determine their composition, and if present, to identify multiple layers which must be independently analyzed. Each material and layer is then homogenized and mounted in the appropriate refractive index oil on a glass slide. These samples undergo direct microscopic examination with the aid of Polarized Light Microscopes to positively identify any asbestos fibers present. Not only must each type of fiber be identified, but also its percent of the total material in the sample must be determined. Walk-in samples welcome, $20 exact cash or check for standard samples. Please read our page on general asbestos information and sampling here before taking your own samples.
RNET's PLM lab offers the following methods for analysis:
- EPA\600\R-93\116
- 400 Point Counts
Our PLM facility is a NVLAP accredited laboratory. A copy of our NVLAP accreditation certificate and scope of work may be found here.
The image above is a photo of tremolite asbestos taken in our laboratory using the PLM microscope.