Asbestos fibers may be released from serpentine rock formations. The California Air Resources Board (CARB) 435 method is used to determine the asbestos content of serpentine aggregate in storage piles, on conveyor belts, and on surfaces such as roads, shoulders and parking lots. Samples are crushed using a mill to produce a material of which the majority is less than 200 Tyler mesh (0.75 microns).
The analytical results are reported in percent asbestos as derived from a 400 point counting technique, which yields a detection limit of 0.25%*.
Sample retention time - 60 days
*Lower Reporting Limits Available - Call for Details.