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The two testing techniques, the Bubble Point Tester and Compression Porometer may seem similar but are different. They both determine quality but with different techniques and for different purposes.

Here, we will be discussing how the two differ from each other.

Bubble Point Tester

The largest pore size in a membrane is measured by finding the stream of bubble which has been downstream.

The required pressure is put to blow air through a liquid-filled membrane. The bubble stream is then seen, which determines the bubble point.

How to Conduct the Test?

The filter is wetted at one end, and gas is passed through it, after which the filter is dipped in the water. There should be no dry spaces, and the water should fill all the spaces inside the filter media. The membrane receives the gas pressure, and a part of it dissolves in the water. The gas solubility is then revealed here.

Low pressure means the downstream of the filter releases the gas into the water. Simultaneously, upstream gas pressure, when it increases, causes the slow downstream to disperse and rise.

After this, a point is reached when the pressure ejects the water from a passageway marking the path flow of air's mass flow. The point where the pressure is created and the airflow occurs is known as the bubble point.

Things to Look into During the Test

For the most accurate test results, you have to certify the following points while the test is being conducted:

  • You have to fully and equally wet the filter and ensure all the pores are filled with water. If the filter is not wetted correctly, the airflow will be hasty, leading to the wrong results.
  • You have to document the stable bubble flow rather than where the airflow disperses because the actual bubble point is where the airflow is stable.
  • You can always open and change the filter casing in case there is a failure. Certify that the filter has been correctly mounted. You can remove the casing and conduct the test again, but you should dispose of the filter and start the test again if there is another failure.

Compression Porometer

The most precise pore structure ranting is found through this machine under pressure.

The effect of compressive stress is measured through this machine on the largest pore diameter. The Bubble Point Tester determines the largest pore diameter through the process we have mentioned above. Along with that, the flow pore diameter, pore distribution, and permeability are also all measured through the Compression Porometer.

This machine was created to test the compressive stress because no labs could determine the most precise results. With the help of this machine, you cut costs and get the most precise results without much effort.

How is the Test Conducted?

You place the sample in the test chamber and adjust the system according to your test requirements. The test is then conducted automatically by the machine providing you with the most accurate results. The test can also be conducted manually which ensures, and you're involved in all the steps.

Several customized tests can be conducted through the machine to ensure the best quality and precise results every time. The numerous tests allow for you to ensure the products are later fit to be used in all kinds of conditions.

Differences

To summarize things in simple words, the Bubble Point Tester determines the largest pore diameter, which is then used by the Compression Porometer to test the compressive stress under several conditions.

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