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Microbial growth on respirator filters from improper storage
A L Pasanen1, J Keinänen, P Kalliokoski
1University of Kuopio, Department of Environmental Sciences, Finland.
Scandinavian Journal of Work, Environment & Health
|December 1, 1993
Summary
High-efficiency respirator filters with cellulose components showed significant microbial growth and particle penetration when stored in humid conditions. This highlights risks associated with storing used respirators in moist environments.
Area of Science:
- Environmental microbiology
- Material science
- Respiratory protection technology
Background:
- Microbiological contamination poses a risk to respirator efficacy.
- Understanding filter material degradation under humid conditions is crucial for safety.
Purpose of the Study:
- To investigate microbial growth and particle penetration in high-efficiency respirator filters under simulated storage conditions.
- To assess the impact of humidity and filter composition on respirator integrity.
Main Methods:
- Two types of high-efficiency respirator filters with varying fiberglass and cellulose content were used.
- Filters were exposed to high microbial loads, incubated at 98% relative humidity, and tested for particle penetration.
- Chemical and microbial analyses of filter materials were performed.
Main Results:
- Filters rich in cellulose exhibited significant fungal growth and increased particle penetration after incubation.
- Humid conditions promoted fungal growth, enabling mycelia and spores to pass through cellulose-based filters.
- Microbial activity and filter composition correlated with filter performance degradation.
Conclusions:
- Storing used respirators in humid environments can lead to substantial microbial contamination.
- Cellulose-based filter materials are particularly susceptible to microbial degradation, compromising respirator function.
- Filter material choice and storage conditions are critical factors in maintaining respirator efficacy.