What is a main different between aseptic filling and terminal sterilization
A brief comparison between the two could be:
Terminal sterilization is when the sterilization process is done when the product is already sealed within its primary container.
Aseptic process starts with materials and components that are already sterilized individualle and then they are assembled/filled/sealed under controlled conditions (aseptic conditions) to mantain the sterility of the product during process.
I hope this helps.