Sensitivity studies for the test method to measure the efficiency of air filtration media against nanomaterials

The filtration efficiency is dependent on an assortment of physical parameters, including the face velocity, particle size, density, charging status, air temperature, pressure and relative humidity, etc. A sensitivity study investigates the change of the filtration efficiency corresponding to variation of these parameters. Part of the sensitivity study was based on the round robin test results among five different laboratories (six different filter media were measured). The aim of the study is to reveal what parameters could affect the filtration efficiency and possibly explain the deviation among the experimental data reported in the round robin test report. In addition the results are important for specification of the range of the parameters in the test method.