{"id":6100,"date":"2024-12-21T17:00:23","date_gmt":"2024-12-21T09:00:23","guid":{"rendered":"https:\/\/www.air-tester.com\/?p=6100"},"modified":"2026-05-13T10:58:00","modified_gmt":"2026-05-13T02:58:00","slug":"2026-qi-mi-jian-ce-zhi-nan","status":"publish","type":"post","link":"https:\/\/www.air-tester.com\/en\/2026-qi-mi-jian-ce-zhi-nan.html\/","title":{"rendered":"2026 Airtightness Testing Guide: From Principles to Practice"},"content":{"rendered":"

In modern industrial production, product quality and safety are the lifeline of enterprise development.Airtightness, as one of the important indicators of product quality, is directly related to product performance, life and safety in use.<\/strong><\/p>\n\n\n\n

Imagine, if the power battery of a new energy vehicle has poor sealing, it may lead to electrolyte leakage and cause safety accidents; if the sealing components of a medical device are defective, it may lead to drug contamination or failure and jeopardize the health of the patient; if the sealing of an aerospace equipment is insufficient, it may malfunction in extreme environments and cause serious losses. Therefore, airtightness testing is not only an important part of product quality control, but also an important barrier to safeguard personal safety and social stability.<\/em><\/p>\n\n\n\n

I. Principle of airtightness testing<\/h2>\n\n\n\n

Gas tightness testing, also known as sealing test or leakage test, is the ability of the product under test to stop gas or liquid leakage through specific methods. Its core purpose is to ensure that the product in a variety of use environment can maintain the stability of its internal environment, to prevent the leakage of media, so as to protect the performance, safety and reliability of the product.<\/p>\n\n\n\n

\"Principle
Animated schematic diagram for airtightness testing<\/em><\/figcaption><\/figure>\n\n\n\n

The basic principle of airtightness testing is to place the inspected product in a specific environment, theBy applying a certain pressure (positive or negative), detecting changes in gas pressure, changes in flow rate or the amount of leaking medium inside or outside of it<\/strong>This is the way to determine whether the sealing performance meets the standard.<\/p>\n\n\n\n

II. Airtightness Testing: Methods and Industry Applications<\/h2>\n\n\n\n

Depending on the test object and application scenario, airtightness testing uses a variety of methods to meet the specific needs of different industries:<\/p>\n\n\n\n

1. Positive pressure method<\/h3>\n\n\n\n

A gas of a certain pressure is filled into the product and the pressure change or leakage is detected.<\/strong><\/p>\n\n\n\n

It is widely used for sealing detection of outdoor products (e.g. LED lights, outdoor Bluetooth audio), home appliances (e.g. water purifier cartridge), and automotive parts. For example, leakage detection of automobile fuel tanks can effectively prevent fuel volatilization and leakage, reducing environmental pollution and fire risk.<\/p>\n\n\n\n

2. Negative pressure method<\/h3>\n\n\n\n

Vacuum the inside of the product to form a negative pressure environment and detect the internal pressure change or leakage.<\/strong><\/p>\n\n\n\n

It is commonly used to test products that need to withstand external pressure, such as medical devices and vacuum packaging. For example, sealing performance testing of medical vials can ensure that the drugs are of good quality.<\/p>\n\n\n\n