Piezoelectric Ceramic is a necessary and important materials which applied inultrasonic cleaner,ultrasonic welding,ultrasonic distance
measure sensor,ultrasonic detector,ultrasonic dental unit,ultrasonic beauty. ultrasonic motor,ultrasonic transformer and other
high-power emanant transducers.

Some Standard Size of Piezo Disc:

Size= Diameter*Thickness(mm)

Kt (%)=Electromechanical coupling coefficient

Size	Thickness Frequency ft(MHz)	Capacitance C(pf)	Impedance Zt(Ω)	Kt (%)
16×0.4	5.0±5%	5400±15%	≤5	≥45
16×2.1	1.0±5%	1000±15%	≤4	≥45
20×1.2	1.65±5%	1180±5%	≤2.5	≥45
20×2.0	1.0±5%	1650±15%	≤4	≥45
25×0.4	5.0±5%	1280±15%	≤4	≥45
25×1.2	1.65±5%	1350±15%	≤2	≥45
25×1.0	2.0±5%	5800±15%	≤4	≥45
25×2.0	1.0±5%	2700±15%	≤4	≥45
28×1.0	2.0±5%	6940±15%	≤4	≥45
28×1.7	1.2±5%	3880±15%	≤3	≥45
28×2	1±5%	3850±15%	≤3	≥45
28×2.0	1.0±5%	3300±15%	≤3	≥45
30×3.0	66.7	2730±12.5%	≤3	≥45
35×3.0	63.0	3100±12.5%	≤3	≥45
38×6.5	59.9	1580±12.5%	≤3	≥45
45×3.0	50.0	5100±12.5%	≤3	≥45
45×3.5	50.0	4700±12.5%	≤3	≥45
50×3.0	46.0	5800±12.5%	≤3	≥45
50×3.5	46.0	6300±12.5%	≤3	≥45
50×5.0	46.0	4150±12.5%	≤3	≥45