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Filtration Testing Lab

The Nonwovens Institute offers a full range of filtration tests in its ISO 17025-accredited lab on the Centennial Campus of North Carolina State University.

NWI has expanded its filtration testing capabilities to include services for facemasks and respirators, along with filter media for automotive, HEPA and HVAC applications, among others. Importantly, NWI’s Filtration Testing Lab is ISO/IEC 17025:2017 accredited, enabling it to meet NIOSH requirements for testing materials used in respirators, and it is outfitted with equipment to perform ASTM F2299 testing for the measurement of Particle Filtration Efficiency (PFE) at 0.1 microns.

Testing equipment available in NWI’s Filtration Testing Lab includes:

  • PALAS MFP-3000-S fractional aerosol filter test
  • Two TSI 8130 machines for filtration efficiency
  • Two TSI 3160 machines for filtration efficiency
  • Two offline charging and discharging units
  • Two environmental chambers for aging and conditioning masks and filter media
  • Testing apparatus for the measurement of fluid resistance for surgical masks
  • Prototyping facility to produce masks for testing purposes per NIOSH Standard Test Protocol

Why test your filter media at NWI?

  • Decades of in-house material testing experience
  • ISO 17025 accredited
  • ISO 9001 accredited
  • ASTM F2299 testing capability
  • Strict adherence to GMP and SOPs
  • Highly competitive pricing model
  • Quick turnaround times

ISO/IEC 17025:2017 test methods include:

  • TEB-APR-STP-0059 : N95
  • TEB-APR-STP-0058 : N99
  • TEB-APR-STP-0057 : N100
  • TEB-APR-STP-0056 : R Series
  • TEB-APR-STP-0051 : P Series
  • ASTM F3502
  • ASTM F1862
  • ASTM F3407
  • ASTM F1980
  • ASTM F2299
  • BS EN 14683:2019 Annex C
  • 16 CFR Part 1610

The NWI Filtration Testing Lab’s ISO/IEC 17025:2017 test methods are A2LA Accredited (Certificate No: 6402.01).

If you wish to use the pilot equipment or have some testing done, you will need to have a Fabrication & Testing Agreement in place.

If you have questions about NWI’s filtration testing services, please email us at

Tests and Specifications

Filtration Testing
Aerosol Filtration
TSI AFT Model 3160 No. 1Filtration efficiency – Mono-disperse aerosol classification
TSI AFT Model 3160 No. 2Modified for ASTM F2299
TSI AFT Model 8130AFiltration efficiency – Poly-disperse aerosol generation method
Palas MFP-3000Fractional aerosol filter test for flat filter media and small filter elements
TSI Portacount Respirator Fit Test Model 8048Quantitative respirator fit testing
Static Charge
Static Analysis SystemMaps a grid of surface of static charge
Static Charge SystemNegative and positive ion charge
Static Discharge SystemElectrostatic discharge; ISO 16890-4 compliant
Blood Penetration
Testex TN 139 Synthetic Blood TesterBlood penetration resistance; ASTM F1862/F1862M compliant
Additional Capabilities
Beckman Coulter Multisizer 4Benchtop analyzer for particle size distribution, volume & surface area
Espec BTL-344 Environmental ChamberTemperature ranges of -20 C-180 C; humidity 10%-95%
45-Degree Flammability Tester TF310Flammability test; 16 CFR 1610, ASTM D1230, ASTM F2100

If you have questions about NWI’s filtration testing services, please email us at