https://www.originltd.com/about-us/faqs/#can-plastic-bottles-be-sterilised
Sterilisation is the process of killing microorganisms (and their spores) from the plastic containers. Sterilisation is crucial for many applications.  We can advise you in selecting the best sterilisation process for your package, this may include autoclaving, exposure to ethylene oxide gas, or irradiation by gamma or e-beam.