Reliability is achieved by setting the maximum operating temperature to 150°C.If you want high efficiency, keep the rated DC voltage (URdc) at 500V.-20/+100ppm/Cel ppm/°C is set as the temperature coefficient for the part.
CMR04E270JPDM Features
a -20/+100ppm/Cel ppm/°C temperature coefficient
CMR04E270JPDM Applications
There are a lot of Cornell Dubilier Electronics CMR04E270JPDM applications of Mica & PTFE Capacitors.