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PCM ASTM 7200

Category Asbestos Lab Services
Test PCM ASTM 7200
Description

Sampling and Counting Airborne Fibers Including Asbestos Fibers, in Mines and Quarries, by Phase Contrast Microscopy and Transmission Electron Microscopy

 

  • This ASTM standard is based on other PCM methods including the NIOSH 7400, OSHA ID-160 and ISO 8672.
  • For the determination of the concentration of fibers/ml of air by PCM
  • Fibers counted are placed into three different groups:
  • Group 1: fibers showing curvature, have splayed ends or appear as bundles
  • Group 2: fibers longer than 10 microns or thinner than 1 micron
  • Group 3:  All other countable fibers
  • If the PCM concentration exceeds ½ the PEL or TLV then examine the data to determine if 50% of the countable fibers fall into group 1 and 2.  If so then there is an increased chance that asbestos is present in the sample and TEM should be employed to supplement the PCM analysis.
  • The method gives guidance for “differential counting”  which can help to indicate whether the fibers in question are asbestiform (vs. cleavage fragments for example)

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