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NIOSH N95 Mask Tests

NIOSH N95 Mask Tests

The Sodium Chloride Aerosol Challenge (NaCl) – NIOSH Respirator Pre-qualification test uses a widely accepted method for evaluating particle penetration and air flow resistance properties of a variety of filtration materials. Respirators must be pre-qualified before submitting to NIOSH for certification; other materials, such as breathing system filters and face masks, are tested to determine filtration efficiency for marketing.

Testing is performed in compliance with 42 CFR Part 84 and NIOSH Procedure No. RC-APR-STP-0057, 0058 and 0059. Nelson Laboratories has extensive experience testing filters and other filtration devices.

Applicable Standards

  • NIOSH 95
  • 42 CFR Part 84
  • NIOSH Procedure No. TEB-APR-STP-0057-0058-0059

Test Options

Standard turn around times (TAT) are listed below. Ask an expert for a specific consultation on your product.

Code Test TAT (days) Request Quote
NRC110 NIOSH Respirator Certification: Sodium Chloride (NaCl) 15 Add
NRC115 NIOSH Respirator Certification: Dioctyl Phthalate (DOP) 15 Add
NRC120 NIOSH Respirator Certification: Inhalation and Exhalation 10 Add
NRC125 NIOSH Respirator Certification: Valve Leak Test 14 Add
NRC110 - NIOSH Respirator Certification: Sodium Chloride (NaCl)
15 days
NRC115 - NIOSH Respirator Certification: Dioctyl Phthalate (DOP)
15 days
NRC120 - NIOSH Respirator Certification: Inhalation and Exhalation
10 days
NRC125 - NIOSH Respirator Certification: Valve Leak Test
14 days

Sample Specifications

NRC110: 20 masks
NRC115: 20 masks
NRC120: 3 masks
NRC125: 3 masks

Study Outline

The Sodium Chloride Aerosol Challenge test is able to determine filtration efficiency measurements up to 99.999%. In this procedure, the TSI® CERTITEST® Model 8130 Automated Filter Tester reservoir is filled with a 2% NaCl solution.* The sample is placed into the filter holder. Cone or molded masks and respirators are mounted to a test fixture and sealed into a cylinder filter holder to ensure that the mask is properly sealed.

Samples are subjected to aerosolized NaCl. The concentration of NaCl is measured before and after impact with the sample. The amount of NaCl that passes through the sample is used to calculate the filtration efficiency of the sample.
Respirators for NIOSH pre-qualification are required to be pre-conditioned at 85 ± 5% RH and 38 ± 2.5°C for 25 hours prior to assessing the filtration efficiency.

There are three categories for NIOSH-certified, non-powered, air-purifying, particulate-filter respirators: N (Not resistant to oil), R (Resistant to oil) and P (oil Proof).

*Only N-series filters are evaluated using a NaCl aerosol, which is slightly degrading to filter medium. Test articles intended to be resistant to oil (R-series) or oil proof (P-series) must be evaluated using an oil-based aerosol.
Test articles submitted for testing according to NIOSH requirements will be tested according to 42 CFR Part 84 “Approval of Respiratory Protective Devices.”