Leak Testing Methods

Back-Pressure Flow Test

When using the Back-Pressure Flow leak test method, the part is continuously pressurized while air is escaping to atmosphere through the passages being checked. 

Burst Test

The Burst Leak Test requires filling a product slowly through a flow valve. After the burst, the pressure rapidly drops to near zero. 



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Continuous Flow Test

The Continuous Flow leak test method allows the flow sensor to measure the flow faster. 


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Crack Test

A Crack Leak test is set up to measure the pressure at which a product, such as a check valve, opens and allows air to flow through.

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Differential Pressure Decay Test

One of the fastest methods of leak testing, differential pressure decay is well suited for many applications. 

Differential Vacuum Decay Leak Test


Differential vacuum decay test works similar to the differential pressure decay test except that the system is evacuated using an internal or external vacuum.

Exercise/Fluff Leak Test

As the name implies, the exercise/fluff leak test is used as a settling or seating step in order to condition the part before a test program is initiated


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Force Decay Test

The Force Decay leak test is used to test the seal integrity of a flexible or semi-rigid package that contains a headspace. It is well suited to test non-porous package material such as films, foils or laminates. 

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Laminar Flow Leak Test

The Laminar Flow leak test is a sensitive flow technique that is commonly used on large volumes where the leak integrity specification is high.

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Mass Flow Leak Test

The mass flow leak test measures the amount of air passing through an object using units of measurement of sccm or liters/time period.

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Occlusion Leak Test

Occlusion Leak test is used to test a product’s open passages by trapping pressure inside the product, then measuring an expected pressure loss.

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Pressure Decay Leak Test

This test method measures the drop in pressure on a gauge (transducer) during the leak test. 


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Pressure Rise Test

A Pressure Rise Leak test works in the opposite way of a pressure decay test.

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Seal Creep Leak Test

A Seal Creep Leak test tests products that must hold a certain amount of air pressure without failing, but may increase in size or “creep up” during the test.



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Sealed Component Leak Test

The Sealed Component Leak Test is used to test parts that are sealed and do not have a port to depressurize. 




Vacuum Burst Leak Test

The Vacuum Burst Leak Test is useful for testing check valves, relief valves, seal strength and package integrity.

Vacuum Decay Leak Test

Vacuum Decay leak testing is used on a variety of products that can only be leak tested at negative pressure.

Not sure which test method is right for your application?

Ask An Expert

Selecting the right equipment and leak test method for your application is not only crucial but also a determining factor in achieving your product development and production goals. At Uson, our team of seasoned experts has extensive experience in providing invaluable guidance on leak measurement equipment and test method selection. We cater to a wide range of industries, including medical devices, pharmaceuticals, automotive, electric batteries, packaging, and industrial applications.

We offer a comprehensive range of leak testing methods, including pressure decay, differential pressure decay, vacuum decay, mass flow, and sealed component leak testing. No matter the size or complexity of your application requirements, our dedicated team at Uson has the expertise to assist you throughout the entire process.

When it comes to quality and performance, our leak testers are built to precise specifications using the latest cutting-edge technology and the highest quality components. We ensure optimal and reliable performance, enabling you to streamline your operations and meet your production targets efficiently.

But our commitment to your success doesn't end with the sale. Uson is renowned worldwide for our exceptional service and support. We understand the importance of ongoing training and support for your equipment and staff, and we are here to provide the assistance you need to keep your operations running smoothly with minimal disruption to production.

Over the years, Uson has aided countless manufacturers in optimizing their testing processes, and we are confident that we can do the same for you. Don't hesitate to reach out to our team today and let us help you achieve your goals.