Establishing baseline expectations for evaluating rigid, semi-rigid, and flexible packaging systems.
: Factors to consider when choosing between various physical and microbial test methods.
TR 27 establishes that a leak is an unintended pathway in a container closure system that allows the escape of product or the entry of environmental gases, liquids, or microorganisms. The report explores how the geometry of a leak (tortuosity, path length, and diameter) influences the rate of mass transfer. 2. Microbial Ingress vs. Physical Leaks
: Immersing filled containers into a highly concentrated bacterial suspension to see if bacteria break through the seal over time.
The report categorizes testing methods into two main groups: pda technical report 27 pdf
TR 27 defines integrity not as a binary "pass/fail" based on visual inspection, but as the ability of a container to prevent the loss of sterility or product quality. It introduces the concept that
Historically, the industry relied heavily on , such as the Blue Dye Immersion test or Microbial Challenge test. These tests are:
For more information on PDA standards and training, visit the official Parenteral Drug Association website at www.pda.org.
| Pitfall | TR 27 Solution | |---------|----------------| | Using dye ingress as a sole release test | Use dye ingress only for development; switch to deterministic for routine. | | No correlation between leak size and microbial ingress | Perform microbial ingress studies with calibrated leaks (e.g., microcapillaries, laser holes). | | Testing only at time zero | Test at stability points and after shipping. | | Ignoring headspace gas ingress | Consider oxygen/moisture ingress for sensitive products (requires additional testing). | | Destructive testing of all samples | Implement non-destructive 100% testing for high-value biologics. | The report explores how the geometry of a
PDA TR 27 was developed to provide a harmonized framework for evaluating the integrity of various container closure systems (CCS). The report shifts the industry focus away from purely qualitative, subjective evaluations toward scientific, data-driven methodology. The primary goals of the technical report include:
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The PDA Technical Report 27 is likely to be of interest to:
A key concept introduced in this report is the . The MALL is the largest leak that still maintains product sterility and stability throughout shelf life. It is not a universal size (e.g., "10 µm") but must be determined empirically for each product based on microbial challenge studies, viscosity, container closure design, and worst-case orientation. For many sterile products, a leak corresponding to a 5–10 µm diameter capillary may be acceptable, but lyophilized products may require tighter limits due to oxygen sensitivity. Physical Leaks : Immersing filled containers into a
Measuring pressure changes in a test chamber to find mass flow leaks.
The latest PDA TR 27 (typically referred to as 2021 revision or current version) incorporates updates for advanced therapies (cell/gene therapies, combination products) and new technologies like laser-drilled hole standards.
Offering strategies for integrity assessment during product development, manufacturing, and stability testing. Superseding Old Guidance: It replaced the earlier PDA Technical Information Bulletin No. 4 , reflecting advancements in sterile packaging complexity. Key Technical Areas Covered
TR 27 has been widely referenced by global health authorities:
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