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Nebuliser Elements | Ultrasonic Nebuliser | Piezo Element PZT element with bulls-eye electrode for nebuliser applications Dimensions in mm. Not to Scale SS foil approx. 0.05 mm thick bonded to the radiating face Thickness adjusted to achieve 1.6 or 2.4 MHz frequency Frequency Tolerance : +/- 5% Material : SP-4 (ºPZT4) or SP-8 (ºPZT8) Can be supplied in 25mm dia.