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Identification of Faceseal Leak Sites on a Half-Mask Respirator.

PB90162389

Publication Date	1990
Personal Author	Oestenstad, R. K.; Perkins, J. L.; Rose, V. E.
Page Count	26
Abstract	A method was developed to identify the location and shape of respirator faceseal leaks by the deposition of a fluorescent tracer. To provide a test environment with stable aerosol concentration and size distribution of 4-methyl-7-diethylaminocoumarin (MDC), an aerosol generating, conditioning and exposure system was designed and tested. Both a mannequin and human subjects were used to test for faceseal leak sites by deposition of the tracer aerosol and subsequent observation under longwave ultraviolet lighting. Test parameters were identified for the optimal definition of leaks. Photographic techniques were developed to document the identified leak sites. Leak sites which could be detected visually and by photographic methods were classified as to their location and their one dimensional shape. The study demonstrated the feasibility of identifying respirator faceseal leak sites with an aerosol of MDC using the described generating, conditioning and exposure system. The system was found to be capable of providing a constant output of an aerosol with the desired size distribution characteristics. Sufficient deposition of the fluorescent tracer was made to allow visual detection of faceseal leak sites on a mannequin and human subjects. Photographic documentation of identified leak sites was presented.
Keywords	Respirators Leakage Protective mask facepieces Tests Fluorescence Aerosols Exposure Design Performance Ultraviolet radiation Methyl diethylaminocoumarin
Source Agency	National Institute for Occupational Safety and Health
NTIS Subject Category	95E - Life Support Systems
Corporate Authors	Alabama Univ. in Birmingham. School of Public Health.; National Inst. for Occupational Safety and Health, Cincinnati, OH.
Supplemental Notes	See also PB90-162397. Sponsored by National Inst. for Occupational Safety and Health, Cincinnati, OH.
Document Type	Technical Report
NTIS Issue Number	199009

Identification of Faceseal Leak Sites on a Half-Mask Respirator.

Identification of Faceseal Leak Sites on a Half-Mask Respirator.
PB90162389

Publication Date	1990
Personal Author	Oestenstad, R. K.; Perkins, J. L.; Rose, V. E.
Page Count	26
Abstract	A method was developed to identify the location and shape of respirator faceseal leaks by the deposition of a fluorescent tracer. To provide a test environment with stable aerosol concentration and size distribution of 4-methyl-7-diethylaminocoumarin (MDC), an aerosol generating, conditioning and exposure system was designed and tested. Both a mannequin and human subjects were used to test for faceseal leak sites by deposition of the tracer aerosol and subsequent observation under longwave ultraviolet lighting. Test parameters were identified for the optimal definition of leaks. Photographic techniques were developed to document the identified leak sites. Leak sites which could be detected visually and by photographic methods were classified as to their location and their one dimensional shape. The study demonstrated the feasibility of identifying respirator faceseal leak sites with an aerosol of MDC using the described generating, conditioning and exposure system. The system was found to be capable of providing a constant output of an aerosol with the desired size distribution characteristics. Sufficient deposition of the fluorescent tracer was made to allow visual detection of faceseal leak sites on a mannequin and human subjects. Photographic documentation of identified leak sites was presented.
Keywords	Respirators Leakage Protective mask facepieces Tests Fluorescence Aerosols Exposure Design Performance Ultraviolet radiation Methyl diethylaminocoumarin
Source Agency	National Institute for Occupational Safety and Health
NTIS Subject Category	95E - Life Support Systems
Corporate Authors	Alabama Univ. in Birmingham. School of Public Health.; National Inst. for Occupational Safety and Health, Cincinnati, OH.
Supplemental Notes	See also PB90-162397. Sponsored by National Inst. for Occupational Safety and Health, Cincinnati, OH.
Document Type	Technical Report
NTIS Issue Number	199009