{"id":6351,"date":"2025-02-12T16:00:37","date_gmt":"2025-02-12T08:00:37","guid":{"rendered":"https:\/\/www.air-tester.com\/?p=6351"},"modified":"2025-02-17T16:52:37","modified_gmt":"2025-02-17T08:52:37","slug":"mi-feng-xing-jian-ce-jie-xi","status":"publish","type":"post","link":"https:\/\/www.air-tester.com\/en\/mi-feng-xing-jian-ce-jie-xi.html\/","title":{"rendered":"Sealability Testing: Concepts, Methods and Equipment Selection Guide"},"content":{"rendered":"

In industrial production and daily life, many products need to have good sealing performance to prevent gas or liquid leakage, so as to ensure the normal operation and service life of the product.<\/p>\n\n\n\n

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For example, car tires need good seals to maintain air pressure, food packaging needs good seals to prevent spoilage, and medical devices need good seals to ensure sterility.Sealability testing is an important means of evaluating the sealing performance of a product.<\/strong><\/p>\n<\/blockquote>\n\n\n\n

Imagine, if the sealing of diving equipment is not good, water will penetrate into the interior, resulting in damage to the equipment and even endangering the lives of divers. This fully illustrates the importance of sealing testing.<\/p>\n\n\n\n

I. Analysis of concepts related to sealing test<\/h2>\n\n\n\n

- Sealing Performance:\u00a0<\/strong>Refers to the ability of a product or equipment to prevent gas or liquid leakage in a closed state. Sealability is one of the important indicators of product quality.
- Leakage:\u00a0<\/strong>It refers to the phenomenon of gas or liquid leakage through tiny pores or gaps in products or equipment. Leakage can lead to degradation of product performance, waste of resources, and even safety accidents.
- Leakage Rate:\u00a0<\/strong>Refers to the amount of gas or liquid that passes through a leakage channel per unit of time. Leak rate is an important indicator of the extent of leakage.
- Sealing Test (Sealing Test) \/ Leak Test \/ Air Tightness Test\u00a0<\/strong>Refers to the test process of detecting whether the product or equipment can effectively stop gas or liquid leakage under closed condition through specific methods and equipment.
- Leak Detection Equipment (LDE)<\/strong>: Refers to specialized equipment used to perform leakage testing, such as Air Leak Tester, True Water Tester, etc.<\/p>\n\n\n\n

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Leakage rate concepts in leakage testing<\/em><\/figcaption><\/figure>\n\n\n\n

Second, commonly used sealing test methods<\/h2>\n\n\n\n

1. Immersion Test\/Bubble Test<\/h3>\n\n\n\n

Immerse the product under test in water and observe for bubbles.<\/p>\n\n\n\n

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Schematic diagram of the immersion bubble method<\/em><\/figcaption><\/figure>\n\n\n\n

2. Pressure Decay Method (PDM)<\/h3>\n\n\n\n

Also known as the Pressure Drop Method, it determines whether a leak exists by monitoring the change in pressure inside the product under test over time.<\/p>\n\n\n\n

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Schematic diagram of pressure drop method<\/em><\/figcaption><\/figure>\n\n\n\n

3. Differential Pressure Method (DPM)<\/h3>\n\n\n\n

Leakage is accurately determined by comparing the pressure difference between the standard and the product under test.<\/p>\n\n\n\n

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Differential Pressure Method Schematic<\/em><\/figcaption><\/figure>\n\n\n\n

4. Tracer Gas Method (TGM)<\/h3>\n\n\n\n

Also known as Helium Detection, this method uses a tracer gas such as helium to detect leaks and accurately measures the amount of leakage by detecting the concentration of helium ions with a high degree of sensitivity.<\/p>\n\n\n\n

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Helium Detection Schematic<\/em><\/figcaption><\/figure>\n\n\n\n

III.Sealing test equipment<\/a>selection<\/h2>\n\n\n\n

Airtightness Tester<\/a>(Air Leak Tester):<\/h3>\n\n\n\n

It is an instrument specially used for testing the air tightness of products or equipment. It usually adopts the pressure drop method, differential pressure method or helium detection method for testing, which has the advantages of high precision and simple operation.<\/p>\n\n\n\n