Internal parts: stainless steel Seals: NBR, EPDM, FPM Viscosity: max 21 mm2/s Response times: opening 0.05 - 1 s; closing 0.5 - 4 s Duty cycle: continuous (ED100%) Cycling rate: 10 - 100 cycles/min Electrical protection: IP65 (with plug to ISO 6952 / ISO 4400) Long term use in humid environment requires the use of sealing sets.