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NIOSH testimony on occupational exposure to methylene chloride by R. W. Niemeier, April 25, 1994.
NIOSH 1994 Apr; :1-7
This testimony contains specific information and comments from NIOSH regarding the proposed ruling on occupational exposure to methylene- chloride (75092) in the paint stripping and flexible foam production industries. The concerns revolve around the recommendations concerning local ventilation, the solvent degreasing tank, push/pull ventilation, localized strategies, the use of a fan, and dilution ventilation as determined in research with the furniture refinishing industry. Examples were offered of local exhaust ventilation designs that can reduce methylene-chloride exposures to below the proposed limit of 25 parts per million (ppm). Push/pull ventilation is not felt to be adequate for furniture stripping operations as the workers must apply stripping solution and scrape the furniture in the area between the push jet and the exhaust slots. A recent publication of NIOSH described a localized dilution ventilation system using an axial fan that permitted concentrations of methylene- chloride ranging from 19 to 110ppm with an average of 65ppm. Eight hour time weighted average concentrations for two workers were 48ppm and 1ppm, stripping for 323 minutes and 24 minutes, respectively.
NIOSH-Author; NIOSH-Testimony; Niemeier-R-W; Solvent-vapors; Ventilation-systems; Chlorinated-hydrocarbons; Air-quality-monitoring; Air-quality-control; Control-technology
NTIS Accession No.
NIOSH, 7 pages, 6 references
Page last reviewed: October 5, 2020
Content source: National Institute for Occupational Safety and Health Education and Information Division