Effects of Ultraviolet Germicidal Irradiation (UVGI) on N95 Respirator Filtration Performance and Structural Integrity
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Open Access
- 25 March 2015
- journal article
- Published by Informa UK Limited in Journal of Occupational and Environmental Hygiene
- Vol. 12 (8), 509-517
- https://doi.org/10.1080/15459624.2015.1018518
Abstract
The ability to disinfect and reuse disposable N95 filtering facepiece respirators (FFRs) may be needed during a pandemic of an infectious respiratory disease such as influenza. Ultraviolet germicidal irradiation (UVGI) is one possible method for respirator disinfection. However, UV radiation degrades polymers, which presents the possibility that UVGI exposure could degrade the ability of a disposable respirator to protect the worker. To study this, we exposed both sides of material coupons and respirator straps from four models of N95 FFRs to UVGI doses from 120–950 J/cm2. We then tested the particle penetration, flow resistance, and bursting strengths of the individual respirator coupon layers, and the breaking strength of the respirator straps. We found that UVGI exposure led to a small increase in particle penetration (up to 1.25%) and had little effect on the flow resistance. UVGI exposure had a more pronounced effect on the strengths of the respirator materials. At the higher UVGI doses, the strength of the layers of respirator material was substantially reduced (in some cases, by >90%). The changes in the strengths of the respirator materials varied considerably among the different models of respirators. UVGI had less of an effect on the respirator straps; a dose of 2360 J/cm2 reduced the breaking strength of the straps by 20–51%. Our results suggest that UVGI could be used to effectively disinfect disposable respirators for reuse, but the maximum number of disinfection cycles will be limited by the respirator model and the UVGI dose required to inactivate the pathogen.Keywords
This publication has 11 references indexed in Scilit:
- B95: A new respirator for health care personnelAmerican Journal of Infection Control, 2013
- Effectiveness of Three Decontamination Treatments against Influenza Virus Applied to Filtering Facepiece RespiratorsAnnals of Work Exposures and Health, 2011
- Impact of Three Biological Decontamination Methods on Filtering Facepiece Respirator Fit, Odor, Comfort, and Donning EaseJournal of Occupational and Environmental Hygiene, 2011
- Evaluation of Microwave Steam Bags for the Decontamination of Filtering Facepiece RespiratorsPLOS ONE, 2011
- A pandemic influenza preparedness study: Use of energetic methods to decontaminate filtering facepiece respirators contaminated with H1N1 aerosols and dropletsAmerican Journal of Infection Control, 2010
- A method to determine the available UV-C dose for the decontamination of filtering facepiece respiratorsJournal of Applied Microbiology, 2010
- Development of a Test System To Evaluate Procedures for Decontamination of Respirators Containing Viral DropletsApplied and Environmental Microbiology, 2009
- Evaluation of Five Decontamination Methods for Filtering Facepiece RespiratorsAnnals of Occupational Hygiene, 2009
- 2007 Guideline for Isolation Precautions: Preventing Transmission of Infectious Agents in Health Care SettingsAmerican Journal of Infection Control, 2007
- Electrostatic Respirator Filter Media: Filter Efficiency and Most Penetrating Particle Size EffectsApplied Occupational and Environmental Hygiene, 2000