Home/FAQ/What makes aseptic different from hot-fill processing?

What makes aseptic different from hot-fill processing?

Aseptic processing and packaging is the filling of commercially-sterilized products into pre-sterilized containers. (1) Commercially-sterile, cooled product is processed separately from the packaging. (2) Incoming packaging is sterilized independently from the product.  (3) Your flexible package then enters a pre-sterilized, enclosed atmosphere that is free of microorganisms, where the cap is removed to begin the filling process. (4) The cap and spout are then re-sterilized with our patented Vapor Sterilant Technology (VST). Filling takes place through the spout. The cap is then hermetically sealed onto the spout, creating a contained sterile package for your aseptic product.

Hot-fill processing fills heated, commercially-sterile product in non-sterile packaging. The product is held for a predetermined time and temperature in order to sterilize the packaging prior to the filling process. The longer hold time at high temperatures reduces quality of the product. Only high-acid products can be hot-filled and held at ambient temperatures without refrigeration.

Retort processing fills non-sterile product in hermetically-sealed, non-sterile packaging. The packaging is loaded into a retort pressure vessel and subjected to pressurized steam.  The product is also exposed to high temperatures for a much longer period than in hot-filling. The additional time can significantly deteriorate the overall quality and nutritional content of the product.

The Aseptic Process for Flexible Packaging

ScholleIPN Simply Flexible

Your total flexible packaging solution from idea to execution.


Packaging for the circular economy

ScholleIPN Circular Economy Icon