Why do my products that contain liquid have to be tested dry?

In order to be able to see the flow of liquid in the chamber it is best to test products containing liquid dry in our chambers.

Products containing liquids often need to be tested “upside down” to ensure that any air remaining in the container does not escape first… The entire part of the product likely to leak must be in contact with the liquid.

Some products that contain very little air can be tested lying down, but you have to make sure that the air is not in contact with the parts that can leak…