October 31, 2007 — /IEST News/ — ARLINGTON HEIGHTS, IL — A newly revised Recommended Practice (RP) from the Institute of Environmental Sciences and Technology (IEST) outlines a procedure for production testing of ultra-low penetration air (ULPA) filters for particle penetration and pressure drop.

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 percent to 0.0001 percent. 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 microns. The methodology may also be applied for particle-counter testing of filters outside the efficiency and particle size range covered in the document.

This edition of the RP includes two new appendixes, “Considerations for Specific Media Types” and “Particle Detection and Particle Size Distribution,” as well as updates to appendixes covering factors influencing measured penetration and recommended calibration intervals.

For more information or to order IEST-RP-CC007.2, visit www.iest.org or call IEST at (847) 981-0100.

About IEST
Founded in 1953, IEST is an international technical society of engineers, scientists, and educators that serves its members and the industries they represent (simulating, testing, controlling, and teaching the environments of earth and space) through education and the development of recommended practices and standards. IEST is an ANSI-accredited standards-developing organization; secretariat of ISO/TC 209 Cleanrooms and associated controlled environments; administrator of the ANSI-accredited US TAG to ISO/TC 209; administrator of the ANSI-accredited US TAG to ISO/TC 142 Cleaning equipment for air and other gases; and a founding member of the ANSI-accredited US TAG to ISO/TC 229 Nanotechnologies.