Product Description Piezoelectric ceramic elements are widely used in various fields electroacoustics, ultrasonics, communications, test and measurements, automatic control, medical ultrasound, ignition, etc. Types, specifications and characteristics of partial piezoceramic elements produced by our company are listed in the following table for broad customers to choose. Special products can be developed and fabricated according to client's requirementsSpecification:P-81 OD8/ID2.5*1.8Features:fs=250kHz±5% Kp=0.62±6% C=315pF±12.5%P81 is equal to Navy Type III Characters high electromechanical coupling factors (k)high mechanical quality factor (Qm )high stability / low dissipation factorcompatible with high voltages / high mechanical loads1 ring-piezoDimensionRadial frequencyCapacitanceDielectric lossElectromechanical coupling coefficientImpedanceThickness frequencyMechanical(mm)(KHz)(pf)tgδ(%(Kp)Zr(Ω)(KHz)quality factor(Qm)Φ25×Φ10×366.41240±12.5%≤0.3≥0.46≤15683±5%800Φ25×Φ10×466.4930±12.5%≤0.3≥0.46≤15512±5%800Φ40×Φ12×545.92070±12.5%≤0.3≥0.46≤15410±5%800Φ40×Φ15×542.21960±12.5%≤0.3≥0.46≤15323±5%500Φ40×Φ17×640.51555±12.5%≤0.3≥0.46≤15341±5%800Φ40×Φ20×537.91700±12.5%≤0.3≥0.47≤15410±5%800Φ50×Φ20×633.22490±12.5%≤0.3≥0.46≤15341±5%500Φ50×Φ17×6.534.82430±12.5%≤0.3≥0.46≤15315±5%800Φ50×Φ23×631.22340±12.5%≤0.3≥0.47≤15341±5%800Φ50×Φ27×629.32100±12.5%≤0.3≥0.47≤15341±5%800Φ60×Φ30×1025.31922±12.5%≤0.3≥0.47≤18205±5%800