IEST revises practice on ULPA filter use

Published: 9-Jan-2008

TheUS-based Institute of Environmental Sciences and Technology (IEST) has revised information on the production testing procedure for using ultralow-penetration air (ULPA) filters to measure particle penetration and pressure drop.


The revised Recommended Practice (RP) – IEST-RP-CC007.2: Testing ULPA Filters – describes the equipment, aerosol properties, processes, and calculations for using particle counters to determine filter efficiency. The penetration range of the procedure is 0.001% to 0.0001%.

This edition now includes the two new appendixes: ‘Considerations for Specific Media Types’ and ‘Particle Detection and Particle Size Distribution’ and updates to appendixes covering factors influencing measured penetration and recommended calibration intervals.

The RP provides guidelines for constructing a suitable test duct and sampling system as well as test criteria for quantifying penetration using test aerosol particles in the size range of 0.1 to 0.2 µm. The methodology may also be applied for particle-counter testing of filters outside the efficiency and particle size range covered in the document.

IEST is based in Arlington Heights, Illinois.

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