Calibrate each personal sampling pump before and after use with a representative filter cassette installed between the pump and the calibration devices.ħ. Packing material that has a high electrostatic charge on its surface (e.g., expanded polystyrene) cannot be used because such material can cause loss of fibers to the sides of the cassette.Ħ. Ship the samples in a rigid container with sufficient packing material to prevent dislodging the collected fibers. If a filter darkens in appearance or if loose dust is seen on the filter, a second sample shall be started.ĥ. Where possible, a sufficient air volume for each air sample shall be collected to yield between 100 and 1,300 fibers per square millimeter on the membrane filter. If the 37-mm cassette is used, an air flow rate between 1 liter/min and 2.5 liters/min shall be selected.Ĥ.
An air flow rate between 0.5 liter/min and 2.5 liters/min shall be selected for the 25/mm cassette. Do not reuse or reload cassettes for asbestos sample collection.ģ. The 37-mm cassette may be used if necessary but only if written justification for the need to use the 37-mm filter cassette accompanies the sample results in the employee's exposure monitoring record. The preferred collection device shall be the 25-mm diameter cassette with an open-faced 50-mm electrically conductive extension cowl. These shall be designated by the manufacturer as suitable for asbestos counting. The sampling medium for air samples shall be mixed cellulose ester filter membranes. All employers who are required to conduct air monitoring under paragraph (f) of the standard are required to utilize analytical laboratories that use this procedure, or an equivalent method, for collecting and analyzing samples.ġ. The sampling and analytical methods described below represent the elements of the available monitoring methods (such as Appendix B of this regulation, the most current version of the OSHA method ID-160, or the most current version of the NIOSH Method 7400). This mandatory appendix specifies the procedure for analyzing air samples for asbestos and specifies quality control procedures that must be implemented by laboratories performing the analysis.
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