Container closure integrity (CCI) is the ability of a container and its closure — a vial with its stopper and crimp, an ampoule, a prefilled syringe, a blow-fill-seal unit — to prevent microbial ingress and keep the product sterile. Container closure integrity testing (CCIT) provides the evidence, both when the container closure system is validated and during routine production.
Test methods fall into two groups. Deterministic methods, such as vacuum decay, high-voltage leak detection, laser-based headspace analysis and helium leak testing, measure a physical property and give objective, quantitative results. Probabilistic methods, such as dye ingress and microbial immersion, depend on chance events and are more variable. USP chapter <1207> gives detailed guidance on choosing and validating methods.
Why it matters in GMP
The revised EU GMP Annex 1 expects container closure integrity to be validated and verified, with containers closed by fusion — such as glass ampoules and blow-fill-seal units — subject to 100% integrity testing, and other containers sampled according to appropriate procedures. A CCIT failure calls the sterility of the batch into question and must be investigated.
- Choose and validate a method suited to the container and the leak size that matters.
- Define sample size and acceptance criteria in advance.
- Treat a failure as a sterility assurance deviation, with batch impact assessed.
How Swat iQua Suite handles it
Swat iQua Suite records CCIT per batch or finished-goods lot: container type, method, sample size, acceptance criteria, result and supporting attachment. Each result is verified by a second person with an e-signature, and a failure automatically raises a deviation and a critical release blocker on the batch, so it cannot be released until the failure is resolved.