Immersion Leak testing

How does the vacuum bubble test work ?

  • Clear the box
  • The packaging inflates under the negative pressure and any leaks become visible through the bubbles that escape from the packaging
  • Purge the box

It allows to test, by vacuum, the tightness of heatsealed solid product packaging or seals containing air, such as blisters, sachets, doypack, yogurt, tray and even mechanical assemblies.

The presence of a leak is detected with the appearance of bubbles in the water during depression, and so is precisely localized. A perforated plexiglass plate, called a presser, allows the product to be held in immersion.

If the company can’t provide this kind of supply, there are models called CTS-I and CTEX-I, which can work with vacuum pumps up to -920 mbar.

This equipment is compatible with the standards:

  • ASTM D4991 : Leakage Testing of Empty Rigid Containers by VacuumMethod
  • ASTM D3078 : Determination of Leaks in Flexible Packaging by BubbleEmission

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You need to choose the most effective solution for your needs, for that you will have to choose among our three control boxes and a box of adapted size.

Choice of the box


Manual Immersion Sealing Box can operate with compressed air & or a vacuum pump.

The CTS is a entirely pneumatic vacuum bell model requiring no operator maintenance.
This sealing box is intuitive and easy to use thanks to its three-way valve. The simple and quick reading of the result due to the needle manometer and the transparency of the box.


The 100% pneumatic immersion seal box operating solely on compressed air.
This model is advantageous because its test is fast, ergonomic and easy to use. It is possible to control the vacuum with a pressure reducer but it is also possible to control the timing of the test. The operator can stop the test at any time by pressing the emergency stop button on the front of the device.


The electropneumatic immersion leak test chamber, can operate with a vacuum pump or compressed air. It will provide you with very accurate data thanks to the use of a precise pressure sensor (+ / – 3 mbar) located in the control box.

Robust model adapted to the production environment. Traceability by a printed time-stamped ticket containing the test information or by a data export software.

Value of vacuum and time entirely configurable in different programs that can be cycled for complex test simulations.

CTEX sealing box

Choice of housing

Box with lid

It is possible to choose boxes with a 100% transparent cover and a possible interior design.
We can also add creepers for handling assistance and holding up.

Several box sizes exist with weights ranging from 7 kg to 28.5 kg and capacity volumes between 7,5L and 60L.

box with lid

door box

Door Box

There are also door pedestals with removable shelves and different arrangements possible.

For this type of box there are 3 models between 25 Kg and 60 Kg and with capacities between 36L and 112,5L.

Our different sizes of standard boxes


Useful box dimensions (mm)* Name of the model Trunk Cabinet Water immersion Methylene blue immersion Cart on request Support cylinder
L300xD300xH400 A1 X X
L400xD400xH400 A2 X X
L500xD450xH500 A3 X X
L250xD200xH150 C1 X X X
L350xD250xH80 C2 X
L350xD250xH150 C3 X X X
L350xD250xH250 C4 X X X X
L450xD350xH100 C5 X X X
L450xD350xH150 C6 X X X X X
L450xD350xH200 C7 X X X X X
L450xD350xH300 C8 X X X X X
L500xD400xH100 C9 X X X
L500xD400xH200 C10 X X X X X
L500xD400xH300 C11 X X X X X

*Custom sizes possibles up to 0,8 m3