The rubber materials (generally NBR) used in pneumatic equipment may crack depending on the concentration of ozone, and it leads to undesirable situations such as air leakage and malfunction.  What troubles may occur? Photo 1 Cracking of diaphragm Photo 2 Cracking of check valve seal Photo 3 Cracking of main valve seal Types of Damage and Malfunctions Device Damaged parts Phenomenon . Constant air leakage from bleed hole . Unable to adjust pressure . Constant air leakage from bleed hole . Unable to adjust pressure . Unable to adjust flow . Air leakage, malfunction . Air leakage, malfunction Diaphragm Main valve seat Valve seat rubber for check valve Check valve seal Main valve seal Gasket Regulator Speed control valve Solenoid valve Cylinder (Actuator) Photo 1 Photo 2 Photo 3 Seals are coated with lubricating grease, so deterioration due to ozone may not be observed. The lubricated type offers the same effect using oil seals. Even with non-lube types, grease is replenished to protect the seals. Therefore, they do not deteriorate. Anti-ozone Equipment Equipment variations . improved resistance to ozone through use of different rubber materials, etc. 27