Asbestos Air Sampling Cassettes
We offer a complete line of PCM and TEM 25mm static conductive air sampling cassettes designed and manufactured to meet all applicable NIOSH, AHERA, OSHA, and EPA standards.
The cassette housings are manufactured in-house from high quality polypropylene and are individually assembled and preloaded under stringent quality control standards.
Once assembled, each cassette is individually tested prior to packaging for shipment. Random lot sample testing is performed daily by an independent laboratory to ensure compliance with asbestos regulations.
- 2" Static Conductive Extension Cowl
- 3 Piece Housing
- Meets regulatory requirements
- Each cassette comes with a unique serial number
In Australia according to the the National Occupational Health and Safety Commission, they have established in the "Guidance Note on Membrane Filter Method for Estimating Airborne Asbestos Fibres (2nd edition Page 27) that;
"Membrane filters (mixed esters of cellulose or cellulose nitrate) of 0.8μm pore size with printed grids must be used and a diameter of 25mm is preferred. Airborne dust should be collected on the upper (grid) surface of the filter"
|Grid||Black Grid||Green Grid|
|Pore Size||0.8μ||0.45μ + 5.0μ||0.8μ||0.8μ||1.2μ|
|Housing Style||25mm with Static Conductive Cowl||25mm with Static Conductive Cowl||25mm with Static Conductive Cowl||25mm with Static Conductive Cowl||25mm with Static Conductive Cowl and White Shrink Band|
Safe Work Australia
Safe Work Australia
Asbestos filters are typically described by the test method used
Phase Contrast Microscopy analysis is specified in the OSHA and NIOSH 7400 sampling methods. PCM methods are intended for personal monitoring pumps. The analyst examines a known area of the filter and counts fibres >5 μm long and >0.25 μm in diameter. All fibre types, asbestos and non-asbestos, are counted; fibre types cannot be distinguished. This method is used mainly for personal samples and occupational exposures to meet OSHA requirements. Total fibre concentrations are given in fibres per mm2 of filter area and fibres per mL (same as fibres per cc). Particle sizing of material roughly 1-100 μm in size can also be performed using PCM.
Transmission Electron Microscope analysis is specified in the EPA-AHERA test method. Note that TEM methods are intended for area pumps, as flow resistance can be too high for a personal pump. Using TEM, the analyst can identify the different asbestos minerals by measuring the Selected Area Electron Diffraction (SAED) pattern, produced by the mineral’s internal crystal lattice structure; and by examining the fibre's Energy Dispersive X-ray Analysis (EDXA) spectrum, which reveals the elemental composition of the fibre.
NIOSH 7402 is intended to be the TEM equivalent of the PCM method, NIOSH 7400, and is used for personal samples. The PCM method will tell you total fibre concentration, regardless of fibre type. The TEM 7402 method will tell you the concentration of each asbestos fibre species and the total non-asbestos fibre concentration. As in PCM method NIOSH 7400, fibres >5 μm long and >0.25 μm in diameter are counted. NIOSH 7402 requires a minimum volume of 400 litres; the volume should be adjusted to achieve a loading of 100 to 1300 fibres per mm2. Results are given as fibre counts, fibres per mm2 of filter area, and fibres per mL.
Safe Work Australia - National Occupational Health and Safety Commission
National Institute of Occupational Safety and Health - USA
Occupational Safety and Health Administration