What is leak testing?
Leak testing is a quality control process used to detect leaks in sealed or pressurized products by measuring changes in pressure, flow, or gas behavior. It ensures that a product is properly sealed and meets safety, performance, and regulatory requirements before it reaches the market.
Why leak testing is used
Manufacturers use leak testing to:
- Detect micro-leaks in sealed components
- Ensure product safety and reliability
- Comply with regulatory standards (FDA, ISO, CE)
- Prevent product failures and recalls
How leak testing works
Leak testing measures physical changes such as:
- Pressure drop over time
- Airflow required to maintain pressure
- Vacuum decay in sealed volumes
- Gas loss or tracer detection
The presence of a leak is identified when measured values deviate from expected behavior.
Main leak testing methods
The most common methods include:
- Pressure decay testing
A sealed product is pressurized. A drop in pressure indicates a leak. - Vacuum decay testing
A vacuum is applied. Pressure increase indicates leakage. - Mass flow testing
The system compensates airflow to maintain pressure. Higher flow indicates leakage. - Tracer gas testing
Uses gas detection to identify extremely small leaks.
Where leak testing is used
Leak testing is essential in:
