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Respirator cartridge efficiency studies. IV. Effects of steady-state and pulsating flow.

The service life of organic vapor respirator cartridges has been evaluated for steady-state and pulsating flow rates; a mechanical breathing simulator was used to evaluate the pulsating flow rates. Two types of cartridge have been tested at work rates of 0, 208, 415, 622, 830, and 1107 kg-m/min and their equivalent respective steady-state flow rates of 14.0, 20.6, 29.8, 36.9, 53.3, and 71.4 liters/min. Cartridge break-through characteristics were recorded with both types of flow for several solvents at 1000 ppm and 0%, 50%, and 80% relative humidity. No significant differences were observed between the steady-state and pulsating flows, even at the highest work rate and humidity conditions. The effective service life appears to be inversely proportional to the flow rate at a given concentration.