Operation Temperature: -40oC -275oC Power Voltage: ≥15KV Operation Power: ≤4Kgf Electromechanical Coupling Coefficient: KPT=0.62 Relative Dielectric Constant: K33=1750 Piezoelectric Constant: D33=400×10-12C/N Service Life: ≥10,000 Sparks Approval: CE