What are the basic methods and tools for tightness testing?

Sealing is not only critical to industries such as electronics and liquid packaging, but also plays an important role in automotive, aerospace, and medical equipment.You don’t want the umbrella to leak when the bag is opened, it’s the same reason.No matter which industry you are in, one day you will face sealing challenges. Fortunately, we at Hirays have a solution!Today we will talk about some basic methods and tools for sealing testing so that you and your products will never leak.

1. Oil stain method

The oil stain method, also known as dye penetrant testing, is a simple and composition-friendly method that has been used as early as the ancestors.The operation is simple: apply a layer of specific fluorescent dye on the surface of the object to be measured, and then wash it off with water or solvent.When developing, use a UV lamp to illuminate the leakage area and leave clear traces.This method is often used to detect tiny cracks and pores, and is ideal for non-porous materials such as metals and ceramics.However, this is not a high-end aerospace-level test, so it is completely sufficient for ordinary car enthusiasts.

2. Negative pressure method

For test scenarios that require higher accuracy, we have the negative pressure method.This method is a bit like sucking the last drop of soy milk out of the bottle.No, you don’t need to be a human vacuum cleaner, just let the vacuum pump do the work.Evacuate the object being tested, and then monitor the change in vacuum level over time.If the vacuum level drops, there must be a leak somewhere!This method is suitable for detecting small leaks and products that require high air tightness, such as medical devices and aerospace equipment. The negative pressure method is definitely your ideal choice.

3. Pressure decay method

The pressure decay method is a good "simple and rough" method, but it is not an exaggeration to say that it is simple.You need another closed container. The pressure decay method detects leaks by comparing the different pressure changes in two closed containers.Using air pressure sensors to monitor differences in pressure attenuation, this method is particularly suitable for products that need to be inspected on a large scale in a short period of time, such as beverage cans, air cylinders, etc.The method is simple and efficient, and the operation is as convenient as making milk in the morning.

4. Immersion method

If you want a classic and intuitive method, go for the immersion method.The object being measured is completely immersed in the water. At this time, you only need to stare at it intently to see if there are any small bubbles emerging.If you see bubbles, then sorry, there is something wrong with the object.The advantage of the immersion method is that it is simple to operate and the results are intuitive. It is suitable for products of various shapes, whether it is a large cup or a small bag. As long as you can soak it in, it can detect it.However, this method is especially suitable for beginners and small household appliances.

5. Helium detection

The helium test method is the “noble” among seal tests: expensive but accurate.Fill the object to be tested with helium, and use a helium leak detector to detect the location and concentration of helium leaks.Helium molecules are extremely small and can detect the smallest leaks, making it a typical example of high-precision detection.Suitable for scenes with high purity requirements, such as semiconductors and laboratory equipment, etc.Therefore, if the object you want to detect is extremely valuable, then you must invite this "Helium Prince".

6. Thermal imaging inspection

The thermal imaging inspection method can be called the "007" in the seal inspection industry.Through infrared thermal imaging technology, temperature distribution changes can be observed online and leak locations can be found.For example, a gas leak can cause a local temperature drop, a change that can be easily captured by an infrared imager.This method does not come into contact with the object being measured, making it ideal for widely distributed equipment, such as large piping systems.With just an infrared thermal imaging device, you can become a master at solving sealing problems.

7. Sonic detection

Finally we talk about high-tech sonic detection.It uses the law of sound wave propagation to find the leak point.It's almost like your mom can hear you playing games through the next wall.The sound waves generated by the leak are captured and analyzed by the sensor, allowing it to work effectively even in noisy environments.Suitable for large equipment with extremely high sealing requirements, such as aerospace and petrochemical industries.This method is efficient and fast, comparable to the aura of a master who listens to gossip.

in conclusion

I hope these methods and tools will help you find the best tool for you in seal testing.Each method has its unique advantages and applicable scenarios: the oil stain method is simple and practical, the negative pressure method is suitable for high-precision requirements, the pressure decay method is efficient and fast, the water immersion method is intuitive and easy to operate, helium detection is extremely accurate, and thermal imaging detection and acoustic wave detection are representatives of high technology.Whether you are a quasi-amateur in the industry or a veteran engaged in professional technology, Haris' sealing testing equipment can definitely meet your needs.Are you ready?Join us and your leaks will never stop!