My project is using pressure sensor BMP581. The PCBA has to withstand Ammonia environment. To resist Ammonia, we plan to do Parylene coating on the PCBA. A search on internet says Parylene C coating should be good on MEMS pressure sensor. Can someone ensure me that a 15um Parylene C coating by CVD on the complete PCBA including the BMP581 will not affect the pressure sensing function?