Vacuum decay container/closure integrity testing technology. Part 2. Comparison to dye ingress tests.

Area of Science:

• Pharmaceutical Packaging
• Analytical Chemistry
• Materials Science

Background:

• Container closure integrity is critical for sterile drug product quality.
• Traditional dye ingress tests have limitations in detecting small defects.
• Previous studies indicated vacuum decay leak testing's potential for package integrity.

Purpose of the Study:

• Compare dye ingress methods (USP, Ph.Eur., ISO) against vacuum decay leak testing.
• Evaluate the detection of 5-15 micrometer defects in prefilled syringes.
• Assess the reliability and accuracy of different integrity test methods.

Main Methods:

• Utilized ASTM F2338-09 standard for vacuum decay leak testing (VeriPac 325/LV).
• Performed comparative analysis with USP, Ph.Eur., and ISO dye ingress tests.
• Tested 1-mL glass prefilled syringes with laser-drilled holes (5, 10, 15 micrometers).
• Study conducted across three sites with multiple inspectors and varied conditions.

Main Results:

• No standard dye ingress method reliably detected all defects.
• Modified dye ingress conditions improved detection but increased false positive risk.
• Vacuum decay leak testing consistently identified defects as small as 5 micrometers.
• Nondestructive vacuum decay method demonstrated superior reliability.

Conclusions:

• Vacuum decay leak testing offers a reliable method for container closure integrity testing of prefilled syringes.
• Standard dye ingress tests require significant modification to approach the reliability of vacuum decay testing.
• The VeriPac 325/LV vacuum decay method is effective for detecting critical defects in pharmaceutical packaging.