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What is the difference between 28khz and 40khz ultrasonic cleaning frequency?

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Frequency is a major factor in choosing an ultrasonic cleaner, and frequency also determines the cleaning strength. Generally speaking, cleaning machines with a frequency of 28KHZ are mostly used for cleaning industries such as hardware, machinery, automobiles and motorcycles, and compressors. Optical optoelectronic cleaning, circuit board cleaning, etc. mostly use 40KHZ frequency.

Granbosonic ultrasonic cleaner

Granbosonic ultrasonic cleaner

Is 40khz more powerful than a 28khz ultrasonic cleaner? 

This is a wrong statement, and the result is just the opposite. The lower the frequency, the stronger the cleaning force and the better the cleaning effect. However, it depends on the cleaning items. For most products, 40Khz frequency is enough. In the case of 28khz low frequency, the time interval of the cleaning liquid being compressed and thinned is longer, so that the bubbles can grow to a larger size, and the force on the surface of the cleaning workpiece is stronger. Therefore, in general, the surface of large parts or the combination of dirt and the surface of the workpiece is high, and the low-frequency ultrasonic cleaning machine is selected, but the low-frequency is more likely to damage and corrode the surface of the workpiece, so it is not suitable to choose a lower frequency for those parts with high surface requirements.

Ultrasonic Frequency

Ultrasonic Frequency

So why can 40KHZ high-frequency cleaning avoid damage to the workpiece?

Everyone knows that the basic principle of ultrasonic cleaning is based on the cavitation effect of the liquid. In fact, the intensity of the cavitation effect is directly related to the frequency. The higher the frequency, the smaller the cavitation bubbles and the weaker the cavitation intensity. And high-frequency penetration is strong, suitable for cleaning precision parts, such as electronic parts, magnetic materials, small bearing processing; those integrated circuit chips, silicon wafer coating use a higher frequency ultrasonic cleaning machine; like those motor vehicle engines, Valves and other large workpieces are generally cleaned with a low-frequency ultrasonic cleaner, while the more moderate frequency used in the market is 40KHZ.

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