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Diffusive airflow integrity testing

P J Waibel1, M Jornitz, T H Meltzer

  • 1Sartorius Corporation, Edgewood, New Jersey, USA.

PDA Journal of Pharmaceutical Science and Technology
|September 1, 1996
PubMed
Summary
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Diffusive airflow testing offers a reliable method for filter integrity assessment, especially when bubble point testing is not feasible. This method accurately correlates airflow to organism retention, enhancing filter validation and production quality control.

Area of Science:

  • Filtration technology
  • Microbial retention studies
  • Process analytical technology

Background:

  • Bubble point testing is a standard method for filter integrity, but can be hindered by diffusive airflows.
  • Diffusive airflow measurements offer an alternative integrity test when bubble point testing is not possible.

Purpose of the Study:

  • To evaluate diffusive airflow measurements as an integrity test for filters.
  • To explore the utility of diffusive airflow testing in various filter applications and validation contexts.

Main Methods:

  • Correlating diffusive airflow measurements with organism retention data.
  • Defining diffusive airflow curves through multipoint measurements using specific liquid products.
  • Implementing single-point diffusive flow testing for production settings.

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Main Results:

  • Diffusive airflow measurements serve as effective integrity tests, particularly when bubble point testing is interfered with.
  • These measurements provide insights into filter incompatibilities, wettability, and clean water flow properties.
  • Single-point diffusive flow testing is validated as a standard method for pharmaceutical production integrity testing.

Conclusions:

  • Diffusive airflow testing is a robust alternative and complementary method to bubble point testing for filter integrity.
  • Product-specific, multipoint measurements are crucial for establishing reliable diffusive airflow curves for validation.
  • Single-point diffusive flow testing is a practical and standardized approach for routine production integrity checks.