Control of methylene chloride-furniture stripping dip tank.
Hall RM; Martinez KF; Jensen PA
Appl Occup Environ Hyg 1995 Mar; 10(3):188-195
A local exhaust ventilation system designed to control exposure of furniture stripping workers to methylene-chloride (75092) fumes was described. A new ventilation system was developed by NIOSH researchers for a furniture stripping facility after it was found that the ventilation system installed by the owners of the facility decreased methylene-chloride levels from 2,160 parts per million (ppm) to 230ppm, which still exceeded the OSHA permissible exposure limit of 25ppm. The design and construction of a slotted hood ventilation system was described. After installation of the new system around the stripping area, air samples were evaluated for methylene-chloride, methanol (67561), toluene (108883), perchloroethylene (127184) and 1,1,1-trichloroethane (71556). No perchloroethylene was detected and 1,1,1-trichloroethane was not detected in 65% of the samples with the others containing no more than 5ppm. Breathing zone samples contained up to 25ppm methanol. Methylene-chloride levels during stripping and rinsing operations fell to 59ppm with the use of the new system and to 13ppm when only stripping operations were being performed. The installation of a local ventilation system in the rinsing area was recommended.
NIOSH-Author; Occupational-exposure; Exposure-levels; Furniture-industry; Furniture-workers; Furniture-repair; Exhaust-ventilation; Ventilation-equipment
Ronald M. Hall, National Institute for Occupational Safety and Health, Division of Physical Sciences and Engineering, 4676 Columbia Parkway-R5, Cincinnati, Ohio 45226
75-09-2; 67-56-1; 108-88-3; 127-18-4; 71-55-6
Applied Occupational and Environmental Hygiene