Vial integrity failures can result from defects in the glass vial, stopper, crimp seal, or sealing interface. Identifying where leakage occurs is an important part of understanding why a vial has failed container closure integrity testing. Helium leak testing provides quantitative leak-rate data that can help narrow the potential cause.
Quick Answer:Helium leak testing uses helium as a tracer gas to detect and measure leakage from a sealed vial. SIMS 1915+ Technology uses helium tracer gas and a sensitive detection system to provide a direct leak-rate measurement. Comparing results from failed and acceptable vials can help identify areas associated with leakage and support further root-cause analysis.
What Can Cause a Vial Integrity Failure?
A vial container closure system includes the glass vial, elastomer stopper, and aluminum crimp seal. A leak can occur when one of these components is damaged, incorrectly assembled, or affected during manufacturing or handling.
| Vial Area |
Possible Issue |
| Glass vial |
Crack, scratch, chip, or defect |
| Stopper |
Damage, deformation, or dimensional variation |
| Crimp seal |
Variation in crimping or compression |
| Sealing interface |
Poor or inconsistent sealing |
Some leak paths may be too small to identify through routine visual inspection. Helium testing provides quantitative information about whether a gas pathway is present.
How Does Helium Leak Testing Support Root-Cause Analysis?
During testing, the vial is exposed to helium and placed in a test chamber connected to a sensitive detection system. If a leak is present, helium passes through the defect and is detected. The system measures the escaping helium and reports it as a leak rate.
SIMS 1915+ Technology is described with sensitivity down to 1 × 10?¹° mbar·L/sec for applicable vial leak testing configurations. The direct leak-rate measurement provides data that can be compared between samples and test conditions.
Comparing leak rates can help identify patterns associated with a component, sealing area, or assembly condition. The results can then be reviewed alongside physical inspection and manufacturing information to support further analysis.
Where Can Leaks Occur in a Vial?
Leaks can occur at different points within the vial container closure system. SIMS 1915+ Technology can help detect leakage associated with the stopper-to-vial interface, crimp seal, and small defects that may occur during manufacturing or handling.
| Vial Area |
Possible Issue |
Testing Information |
| Glass vial |
Crack or defect |
Helps detect a possible leak path |
| Stopper |
Damage or deformation |
Helps evaluate leakage associated with the stopper |
| Stopper-vial interface |
Poor sealing |
Helps evaluate the sealing area |
| Crimp area |
Poor sealing |
Allows leak rates to be compared |
How Can Leak-Rate Data Help Identify the Cause?
A quantitative leak-rate result provides more information than a simple pass-or-fail result. The data can be compared across failed and acceptable samples to determine whether a pattern exists.
Relevant information can include:
- Vial and stopper dimensions
- Component lot information
- Crimping and assembly conditions
- Visual or microscopic inspection
- Storage or temperature-conditioning conditions
- Results from acceptable control samples
Helium leak testing can form one part of a broader failure analysis process. The leak can be confirmed, individual sample leak rates recorded, suspected areas examined, and failed samples compared with acceptable samples. Retesting after a relevant process or component change can provide additional information.
PTI's helium leak testing is used to support vial failure analysis, package development, tooling qualification, packaging line setup, and validation.
Key Takeaway
Helium leak testing provides quantitative data that can help manufacturers understand vial integrity failures. By comparing leak rates across samples, components, and assembly conditions, the method can help narrow the areas associated with leakage.
SIMS 1915+ Technology provides direct leak-rate measurements for detecting very small vial leaks. When these results are combined with physical inspection and process information, they can provide useful evidence for further root-cause analysis.
Frequently Asked Questions
1.Can helium leak testing identify the exact root cause of a vial failure?
It can help identify and characterize leakage and narrow the areas requiring further analysis. Additional inspection and process data may be needed to establish the physical cause.
2.What vial components can be evaluated?
The glass vial, stopper, crimp seal, and stopper-vial sealing interface can be evaluated using suitable test configurations.
3.Can SIMS 1915+ Technology detect very small vial leaks?
Yes. The technology is described with sensitivity down to 1 × 10?¹° mbar·L/sec for applicable vial leak testing configurations.
