How to do air tightness test if plastic parts have no holes?
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How to do air tightness test if plastic parts have no holes?

Posted Date: 2024-01-28

In modern manufacturing, plastic products are widely used in various fields due to their excellent performance and low manufacturing costs. However, for plastic parts without holes, how to conduct air tightness testing is a challenge. This article will detail how to perform air tightness testing on plastic parts without holes.

1. Why is air tightness test needed?

The air tightness test is to test whether plastic parts can effectively prevent the penetration of gas to ensure their safety and reliability in a specific environment. For plastic parts without holes, there may be tiny defects or cracks inside them, which may affect the air tightness. Therefore, it is very necessary to conduct air tightness test.

2. How to conduct air tightness test of non-porous plastic parts?

Pressure method: This is the most commonly used method. It applies a certain pressure inside the plastic part and then observes the changes in pressure to judge the air tightness of the plastic part. If the pressure does not drop significantly within the specified time, the plastic part can be considered to have good air tightness.

Gas penetration method: This method is to fill a certain amount of gas inside the plastic part, and then observe the gas penetration within a certain period of time to judge the air tightness of the plastic part. If the amount of gas penetration is very small within the specified time, the plastic part can be considered to have good air tightness.

Ultrasonic method: This method is to judge the airtightness of plastic parts by emitting ultrasonic waves into the interior of plastic parts, then receiving the reflected ultrasonic waves, and analyzing the propagation of ultrasonic waves. If the propagation of ultrasonic waves is good, the plastic part can be considered to have good air tightness.

3. Precautions

When conducting air tightness tests on non-porous plastic parts, you need to pay attention to the following points:

(1) Test environment: The temperature, humidity and other conditions of the test environment should be kept as stable as possible to avoid the impact of these factors on the test results.

(2) Test equipment: Test equipment should be calibrated regularly to ensure its accuracy.

(3) Test method: Choose an appropriate test method to obtain accurate test results.

(4) Analysis of test results: Conduct a detailed analysis of the test results to find possible defects in plastic parts.

in conclusion

Although the air tightness test of non-porous plastic parts is challenging, by choosing the appropriate test method and paying attention to some details, we can still obtain accurate and reliable test results. This is of great significance to ensure the quality and safety of plastic parts.


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