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Frequently Asked Questions
Answers on instruments, methodology, testing services, and consulting — organized by topic.
Gas and airflow resistance, filter and mask testing
General company & services
Membrane and filtration systems
Methodology, samples, and applications
Permeameters and permeability testers
Porometry, porosimetry, and pore-size analysis
Pressure, leak, and burst-pressure equipment (APP series)
Pycnometers and density measurement
Sorptometers, surface area, and gas-analysis instruments
What do the Frazier and Gurley Permeability Testers measure?
Can PMI machines test surgical masks, respirators, and garments?
How does the PMI Integrity Tester work for filter cartridges/membranes?
What standards do PMI gas-flow/permeability instruments follow?
What data does PMI provide for filter integrity/bubble-point/through-pore testing?