Hi, I'm currently building a 10Hz low pass filter after an integrator stage to reduce the DC noise before it enters an ADC. It is currently around 20mVpp and I would like to reduce it to around +-1mvp. The filter is a 4th order butterworth. I know which values of capacitors I need to use (from microchips filter lab program). However, I need help which type of caps to use. I've been researching but there is no real concrete answer I could find. I'm leaning toward polypropylene but if anyone has any input or a guide they follow, any reply would be greatly appreciated. Thanks.