What is DOP (Dispersed Oil Particulate) testing?

DOP, or filter integrity, testing is the process in which the integrity of your HEPA (High Efficiency Particulate Air) or ULPA (Ultra Low Penetration Air) filter is tested through the introduction of particulates.

Using DOP testing equipment, oil is dispersed as an aerosol into the upstream flow of the filter media, while the number of particles in the downstream flow is measured using a calibrated photometer.

With cleanrooms often protecting mission critical environments, filter integrity and efficiency is vital; HEPA filters are tested to 99.99% @ 0.3 micron efficiency with ULPA filters tested to 99.9995% @ 0.12 micron. During the DOP the whole filter face is tested to ensure that any damage or leak will be detected and located.

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