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WORKING DRAFT 9.15.92—Performance Evaluation of DM and DFM Filter Respirators
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Presented in a 1980 NIOSH report[1] and published in 1986.[2] The NIOSH researchers used a 0.6 to 0.8 μm (GSD of 2, which is about a 0.14 um count median diameter aerosol) NaCl aerosol without charge neutralization to test several NIOSH-certified DM and DFM filters at a flow rate of 32 L/min per filter. They reported the following initial test results from one filter tested Per run at various relative humidities ranging from 10 to 90%: 10%, 7%, and 7% leakage through Norton 7500-6A DM filters; 3.3%, 2.4, and 1.0% leakage through 3M 9910 DM filter masks; and 1% or less for the other DM and DFM filters.!” They reported the following test results after one hour of testing with the NaC] aerosol at 15 mg/m*: 27%, 24%, and 17% leakage through Norton 7500-6A DM filters; 4.7%, 3.9%, and 3.5% leakage through 3M 9910 DM filter masks; 6.4% leakage through a Willson R-30 DM filter; 2.8% leakage through a 3M 9900 DM filter mask; and 1% or less for the other DM and DFM filters.’ Reed et al. also used a 0.3 4m geometric mean diameter (GSD of

1.2) DOP oil aerosol to test several NIOSH-certified DM and DFM filters at a flow rate of 42.5 L/min per filter. They reported the following test results for mean filter leakage: 88% leakage for the Norton 7600-6A DM filter, 87% leakage for the AO R-30 DM filter, 69% leakage for the AO R-56 DFM filter, and 5% leakage for the MSA S DFM filter.!#’ They stated:

The initial penetration of DOP for DM filters started at about 3% and reached 88% after about five minutes. This rapid increase in DOP penetration results from degradation of the filter me- dia and was noted for some DFM filters as well,/5?

In 1979, Smith et al. reported on the use of a 0.70 um MMAD (GSD of 2, which is about a 0.14 ym count median diameter aerosol) NaCl aerosol to test several NIOSH- certified DM and DFM filters at a flow rate of 32 L/min per filter.’ They reported



‘"Tbid., Table VI, p. 8. “hid., Table VI, p. 58. ‘8Nbid., Table [V piS2s “bid, p. 52.

Smith, D. L., O. E. Johnston, and W. T. Lockwood: The Efficiency of Respirator Filters in a Coke

Oven Atmosphere, Am. Ind. Hyg. Assoc. J. 40(12}: 1030-1038 (1979). ‘

  1. ↑ Reed, L. D., D. L. Smith, T. C. Mollman, and I. J. Frockt: Comparison of Respirator Particulate Filter Test Methods, NIOSH, Cincinnati, OH (August 1980).
  2. ↑ Reed, L. D., D. L. Smith, and E. S. Moyer: Comparison of Respirator Particulate Filter Test Methods, J. Int. Soc. Resp. Prot. 4(3):43–60 (1986).
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