Avoid Excessive Vacuum Pressure in Blister Machines During GMP Packaging

Do Not Use Excessive Vacuum Pressure on Blister Machines

Remember: Avoid applying excessive vacuum during blister packaging — it can cause cavity deformation, product damage, and compromise packaging integrity.

Why This Matters in GMP

Blister packaging machines use vacuum pressure to draw forming film into cavity molds and to ensure proper sealing. If the vacuum level is too high, it can collapse blister cavities, deform products, or affect the adhesive seal. This leads to appearance defects, seal failures, or even exposure of the product to air or moisture. GMP packaging operations must ensure precise vacuum control to preserve product presentation and barrier functionality.

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For example, when packaging soft capsules or coated tablets, excessive vacuum can crack coatings or warp tablet shape. Inconsistent cavity shapes may also cause leaks, making the package unsuitable for stability storage or market distribution. These packaging defects are not always immediately visible but can lead to long-term degradation or regulatory recalls.

Regulatory and Compliance Implications

21 CFR Part 211.94 requires that packaging systems protect products from contamination, damage, and environmental hazards. EU GMP Annex 15 includes packaging process validation as part of equipment qualification. WHO GMP highlights that packaging systems must

be designed and controlled to ensure product stability throughout shelf life.

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Auditors may request packaging machine qualification data, seal integrity test results, and in-process control documentation for blister packs. Excessive vacuum or inconsistent cavity formation may result in observations for inadequate equipment settings, unvalidated packaging conditions, or packaging design failures.

Implementation Best Practices

Calibrate blister packaging machines for optimal vacuum ranges based on material thickness, cavity size, and product sensitivity. Perform periodic verification of vacuum pressure during each packaging run and document settings in batch records. Conduct leak testing or vacuum decay testing post-packaging to verify seal integrity.

Train operators on standard vacuum settings for each product and signs of over-vacuum (e.g., collapsed blisters, product movement). Include vacuum setpoint checks during line clearance and QA process audits. Investigate packaging complaints or stability failures for potential vacuum-related causes and adjust parameters accordingly.

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Regulatory References

– 21 CFR Part 211.94 – Container and closure systems
– EU GMP Annex 15 – Qualification and validation
– WHO TRS 961, Annex 9 – Good packaging practices
– USP – Package Integrity Evaluation