Air Filter Efficiency Test Method
Counting Method (DOP/PSL)
Applicable to ULPA/HEPA filter
Applicable test aerosol is DOP (di-octyl phthalate) or PSL (polystyrene latex spheres). This kind of aerosol is generated by monodispersion and fed into the upstream side of the testing filter. Use two particle counters to measure the concentrations upstream and downstream to determine the collection efficiency.