LifeASSURE™ PFS Series Filter Cartridge Integrity TestingSource: 3M Purification
Integrity testing is the end user's method of confirming the structural integrity of a membrane filter before and after use. It is a nondestructive testing that has been correlated to bacteria retention and validates the performance of the filter cartridge. An "in specification" result confirms the porosity of filter membrane and that the cartridge is structurally integral.
Compressed gas and tank vent filters are typically sterilized in-place as part of the production process system to ensure the equipment has maintained sterility after in situ sterilization and that the equipment is ready to receive sterile product. Compressed gas and tank vent filters are non-product contact filters and are usually used over an extended period of time as compared to liquid filters that are typically discarded after a single product batch has been filtered. Hydrophobic compressed gas and tank vent filters are typically subjected to multiple sterilizations and; therefore, integrity tested multiple times as compared to filters used in liquid filtration applications.