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Particle Filtration Efficiency (PFE)

Particle testing occurring at Nelson Labs

The Particle Filtration Efficiency (PFE) Test evaluates the nonviable particle retention or filtration efficiency of filter media and other filtration devices at sub-micron levels. PFE testing is performed on face masks and all filter material that allows 1 cubic foot per minute (CFM) flow to pass through it.

Also referred to as the Latex Particle Challenge, this testing is required for, and performed according to the ASTM F2100. This testing also follows the basic principle of ASTM F2299. Nelson Labs is one of the only laboratory companies to offer this test. Due to this experience, we offer a high level of expertise in performing PFE testing. In addition, Nelson Labs can carry out all ASTM F2100 testing needed with proficiency.

Applicable Standards

  • ASTM F2100
  • ASTM F2299


Study Outline

In Particle Filtration Efficiency testing, the filtration efficiency of filter media materials against sub-micron particles cannot be determined using viable challenge particles. This procedure involves the generation of a particle aerosol using NIST traceable polystyrene microspheres with a Particle Measurement Systems (PMS) Model PG-100 particle generator. The particles are counted with a PMS Model LASAIR II-110 or 310 laser particle counter.

The latex particles used in this procedure have a narrow standard deviation and the design of the PMS particle generator produces a consistent particle challenge. Testing is conducted at a single particle size. Nelson Labs has the capability to perform the testing at 0.1µm, 0.3µm, 0.5µm and 1.0µm. ASTM F2100 specifies a challenge particle size of 0.1µm. The PMS particle counter is an optical laser based device and operates at a flow rate of 1 cubic foot per minute (CFM) or 28.3 liters per minute (LPM).


Testing Locations

  • Salt Lake City, UT, USA

Learn more about our locations and their certifications.

Contact Us 

If you have additional questions about Particle Filtration Efficiency (PFE) testing, or would like to consult with the experts at Nelson Labs, just send us a request or call us at +1 (801) 290-7500.

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