P-8: It belongs to Fe and Ca modified binary system materials. The main characteristics are low dielectric loss in strong fields, high mechanical strength, and good stability. It is mainly used to make large sonars, large cleaning machines, powerful ultrasonic processing, and emulsification. Wait for the transducer. (High Power)
P-4: Fe-barium, manganese-calcium modified lead zirconate titanate, with high electromechanical conversion efficiency, suitable for ultrasonic processing of high-power ultrasonic generators and ultrasonic cleaning of transducer elements. (Medium power)

Different materials, PZT-4, are generally defined as transmitting type, and PZT-8, generally defined as transmitting and receiving type.