Abstract
This paper presents a detailed coverage of the relevant considerations pertaining to the calibration of cascade impactors. A simple and inexpensive method utilizing a poly disperse wax aerosol is described. In the method an aerosol is generated by the condensation of wax vapor. The size distribution of the aerosol is controlled by the flow rate of a carrier gas stream. Microscopic counting and sizing procedures are detailed. Various methods for evaluating impactor performance characteristics are reviewed and discussed. Calibration data using this method are presented for a commercially available impactor and for a specially constructed cascade impactor.