What is the best frequency for ultrasonic cleaning
The level of frequency needed to properly clean an item depends on the type of the item and the contaminants that should be removed from it. The bubbles are bigger and the implosions are more powerful when the frequency is lower. On the other hand, the bubbles are smaller and the implosions are less powerful when the frequency is higher. Higher frequencies also produce more cavitation bubbles.
In industrial cleaning, the frequencies used are lower than 80 kHz. That is because the items are sturdy and the contaminants are plenty and big. The items can withstand the powerful implosions and the contaminants are easily removed by the big bubbles. When it comes to cleaning small and delicate items, the frequencies used are higher than 80 kHz. If the contaminants have different types and sizes, multiple frequencies should be used. Use low frequency first to remove the large contaminants and then use high frequency to remove the smaller contaminants. The low frequency phase should last for a short period of time only. The high frequency phase should last long. This is the ideal way to clean items with varying types and sizes of contaminants. By not exposing an item to low frequency for a long period of time, cavitation erosion can be prevented.