How to test the sealing performance of Aluminum Air Vent Covers?

Testing the sealing performance of Aluminum Air Vent Covers can ensure that they effectively prevent air or liquid leakage, thereby ensuring their performance in specific applications. The following are several commonly used methods to test the sealing performance of Aluminum Air Vent Covers:
Visual inspection method:
Directly observe the surface morphology of the aluminum vent cover to check for damage, looseness or foreign matter.
Use a magnifying glass or microscope to check for fine cracks and wear to ensure the appearance integrity.
Measure the size and shape of the aluminum vent cover and compare it with the standard data.
Pressure test method:
Use an air pressure tester or a hydraulic pressure tester to apply pressure to the aluminum vent cover and observe the pressure changes to judge the sealing performance.
This method can detect smaller leaks, but it cannot determine the specific location of the leak point.
Liquid leak detection method:
Apply liquid leak detection agent (such as foam liquid, fluorescent liquid, etc.) on the surface of the aluminum vent cover and observe the liquid penetration to judge the sealing performance.
This method can detect tiny leaks and determine the leak location through fluorescence characteristics, etc., but it is not suitable for high temperature environments.
Gas leak detection method:
Use dry nitrogen leak detection method or mass spectrometry detection method to generate a certain pressure difference around the aluminum vent cover, and detect leaks through the phenomenon of gas outflow.
This method can detect tiny leaks and determine the leak location and leak rate.
Aluminum foil bag seal tester method (if the size of the aluminum vent cover allows):
Put the aluminum vent cover into the sealing barrel of the aluminum foil bag seal tester, press it with the top cover and immerse it completely in water.
Turn on the power switch of the aluminum foil bag seal tester and set the vacuum pressure and time parameters according to the detailed standards.
Observe whether there are continuous bubbles generated in the aluminum vent cover in the vacuum environment to judge its sealing performance.
Ultrasonic detection method:
The principle is that the leak point will generate ultrasonic waves, and the leak point can be found using an ultrasonic detector.
This method is suitable for detecting leaks in gas pipelines, but it is necessary to scan and detect all surfaces of the aluminum vent cover.
Halogen gas leak detection method or hydrogen-helium leak detection method:
Put a certain pressure of halogen gas or hydrogen-helium gas into the aluminum vent cover, and use the corresponding detector to detect whether there is gas leakage on the outside.
This method can detect a small leakage rate, but it also requires scanning and detection on all surfaces.
During the detection process, the appropriate detection method can be selected according to the specific application requirements and environmental conditions of the aluminum vent cover. At the same time, in order to ensure the accuracy of the test results, it is recommended to conduct the test in a professional laboratory or equipment.