| Bubble Point Test | A filter leakage test in which the filter is wetted and air pressure is applied and slowly increased until water is expelled from the largest pores and bubbles appear from a submerged tube in a downstream collection vessel. Vigorous bubbling, as opposed to a diffusional airflow or occasional bubbles, is indicative of reaching the bubble point. This visual test can be fairly accurate for low area filters, such as discs. When used to evaluate high area filters, it is subject to limitations in observation, test time, collection conditions, and pressurization rates. The bubble point test is not recommended for integrity testing of filter cartridges. |
