Evaluation of carbon tetrachloride replacement agents for use in testing non-powered organic vapor front-mounted/back-mounted canisters.
Moyer-ES; Peterson-JA; Calvert-C
Morgantown, WV: U.S. Department of Health and Human Services, Public Health Service, Centers for Disease Control and Prevention, National Institute for Occupational Safety and Health, 1995 Mar; :1-28
Potential substitute organic vapor test agents were evaluated for use in certifying front mounted/back mounted canisters. Tests were conducted to identify agents and challenge concentrations which would prove equivalent to the present criteria for carbon- tetrachloride. Potential replacement agents included ethyl-acetate, pentane, n-hexane, and heptane. The most severe test condition was the 85% relative humidity preconditioned canisters test at 20,000 parts per million (ppm), 50% relative humidity, 32 liters per minute, 25 degrees-C and a 12 minute minimum breakthrough time at a 5ppm breakthrough concentration. Ethyl-acetate was eliminated because of its water solubility. Heptane and n-hexane were eliminated because of their lower flammability limits, which limited their challenge concentration test range. The effect of test relative humidity on as received canisters for pentane was minimal. The data for pentane indicated that the breakthrough times for the as received canisters tested at 80% relative humidity, 64 liters per minute, 25 degrees, and a 50 minute breakthrough time at a 5ppm breakthrough concentration was comparable to the carbon- tetrachloride criteria. The authors caution that only NIOSH certified canisters were investigated in this study and that this is a limitation. Additional work is needed to ascertain if pentane can adequately screen sorbents with highly diverse characteristics.
NIOSH-Author; Respiratory-protection; Hydrocarbons; Personal-protective-equipment; Respirators; Laboratory-techniques; Adsorbents; Organic-solvents
NTIS Accession No.
National Institute for Occupational Safety and Health