When designing an industrial ultrasonic cleaning tank, selecting the correct piezoelectric ultrasonic transducer is critical. The most common options for equipment manufacturers are 28kHz and 40kHz models. Frequency directly determines cavitation behavior, cleaning force, and suitable applications.
28kHz Ultrasonic Transducer
28kHz ultrasonic transducers generate larger cavitation bubbles with higher implosion energy. The strong shock effect can quickly remove heavy grease, carbon deposits, and stubborn contaminants from sturdy metal workpieces. It also provides deeper vibration penetration into blind holes and complex casting structures.
✅ Best for: Heavy-duty cleaning tasks such as automotive engine parts, steel forgings, and mechanical components.
⚠️ Limitations: The strong impact may scratch thin or fragile components with prolonged use; higher operating noise.
40kHz Ultrasonic Transducer
40kHz ultrasonic transducers produce smaller and denser cavitation bubbles. The cleaning effect is more uniform and gentle. Although the impact of a single bubble is weaker, the dense cavitation field can efficiently clean tiny gaps and fine surface residues.
✅ Best for: Precision components, PCB boards, medical parts, optical accessories, small hardware, and delicate materials.
✅ Advantage: Operates more quietly and delivers consistent cleaning results in small and medium-sized tanks.
Important Note: Impedance Matching
In addition to cleaning performance, equipment manufacturers need to consider impedance matching between ultrasonic transducers and generators.
Both 28kHz and 40kHz piezoelectric transducers require matching power drivers to achieve stable output and extend service life. Poor matching may cause overheating, power reduction, or premature transducer failure.
How to Choose?
- 28kHz: Heavy dirt removal for robust metal parts
- 40kHz: Precision cleaning of delicate and small components
- Dual-frequency: Ideal for cleaning mixed workpieces
We supply 28kHz & 40kHz piezoelectric ultrasonic transducers and matching ultrasonic generators for equipment integration. Sample testing is available to verify performance for your cleaning tank project.
If you need technical datasheets or impedance parameters, please contact our team.
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