Respiratory filter efficiency comparison of dioctyl phthalate (DOP) and hitec 164.
Berardinelli-SP Jr.; Moyer-ES
Dioctyl-phthalate (117817) (DOP) and Hitec-164 were employed as challenge agents for determining respirator filter performance. Respirator filter penetration as a function of aerosol loading was monitored for four commercially available respirator filters, three high efficiency (HE) filters and one new type dust, fume and mist (DFM) filter. The investigation was conducted to obtain baseline data for DOP to be used as a comparison in future investigations which evaluate the filter efficiency characteristics of potential nontoxic DOP replacement aerosol challenge agents. The HE filters tested revealed filter efficiency greater than the minimum criteria set forth in 30 CFR Part 11. The HE filters did not significantly degrade with liquid aerosol loading and appeared to conform to the criteria proposed in the 42 CFR 84 August 27, 1987, proposal. No differences could be distinguished between the instrumental and aerosol generation methodology (hot/cold) probably due to the high efficiency of the HE filters and/or to the variability or rapid degradation of the DFM filter tested. The Hitec-164 did not appear to be a suitable substitute for DOP as it demonstrated a significantly reduced degradation effect on the DFM filter tested and therefore gave higher efficiencies than DOP. The authors state that to test the comparability between liquid aerosol penetration characteristics, filters with efficiencies between 92 and 98% which do not rapidly degrade would be ideal.
NIOSH-Author; Phthalates; Respirators; Respiratory-protection; Personal-protective-equipment; Filter-materials; Filter-fabrics; Filter-membranes
NTIS Accession No.
Division of Safety Research, NIOSH, Morgantown, West Virginia, 112 pages, 26 references