Laboratory Evaluation of Respirators Designed for Use Against Particulates.
NIOSH 1980 Sep:453-468
The necessity of using quantitative measurements and protection factors to determine compliance of dust respirators with a standard specification was evaluated. Qualitative testing of dust respirators using Orthochlorobenzylidene-malononitrile (2698411) (CS) as a challenging agent was compared with quantitative testing using a sodium-chloride (7647145) (NaCl) particulate cloud system. Powered air purifying respirators, air supplied hoods, and single- use disposable respirators were tested. The qualitative method was easy to carry out, required very little equipment, and was capable of identifying a poorly fitting respirator or one with a less than highly efficient filter. However, this method could not distinguish between a poor filter and one with filtering ability suitable for many industrial applications. In addition, the effects of CS on human subjects can be unpleasant, making it difficult to obtain test subjects. The NaCl quantitative evaluation provided an excellent means of assessing the powered air purifying respirators. However, its use with disposable respirators requires considerable expertise. The authors conclude that both methods can give useful results and recommend that the quantitative method using NaCl be included in the Australian standards for evaluating respiratory protective devices.
Analytical-methods; Materials-testing; Respiratory-protective-equipment; Safety-equipment; Safety-engineering;
Papers from the NIOSH International Respirator Research Workshop, September 9-11, 1980, Division of Safety Research, NIOSH, Morgantown, WV