Sterilization modality picker

FAQ

Which ISO standards cover common sterilization modalities?

Moist heat (steam) sterilization of health-care products is addressed by ISO 17665. Ethylene oxide sterilization is addressed by ISO 11135. Radiation sterilization (gamma, electron beam, X-ray) is addressed by the ISO 11137 series. Vaporized hydrogen peroxide and other low-temperature oxidative processes have their own guidance and standards; materials compatibility and process challenge devices still have to be shown for the load you actually ship.

When is steam the preferred first look?

When the device and sterile barrier system tolerate moist heat in the usual 121–134 °C range, steam is often the cleanest validated modality: no EtO residuals, no radiation dose effects on polymers. Electronics, batteries, many adhesives and heat-labile polymers will not tolerate it, which is why this helper asks about heat and moisture first.

What are the main trade-offs for EtO vs radiation vs VH2O2?

Ethylene oxide (ISO 11135) suits many heat-labile, packaged devices but brings aeration time and residual limits. Radiation (ISO 11137) is dry and penetrating, but dose can embrittle PTFE, some adhesives and battery chemistries; e-beam is typically faster and less penetrating than gamma. Vaporized hydrogen peroxide can work for some lumen and electronics loads when materials and packaging are compatible, but penetration and process challenge design are load-specific.

Does this picker replace sterilization validation?

No. Overkill vs underkill, bioburden, sterility assurance level, process challenge devices, and packaging integrity are decided in a validated process under the applicable ISO standard and your quality system. This page is a materials-first triage before you lock a contract sterilizer.

How do sterilization choices affect biocompatibility and shelf life?

The sterilization process is part of the finished device’s manufacturing history. Residuals, material changes and packaging effects feed ISO 10993 biological evaluation and stability / shelf-life claims. Re-evaluate biocompatibility and aging when you change modality, dose, cycle or sterile barrier.

What about dense metal or battery packs?

Thick metal can shield radiation dose; batteries and some chemistries are sensitive to both heat and radiation. Those constraints often push teams toward EtO or VH2O2, provided materials, lumens and residuals can be validated. Confirm with a materials matrix and sterilizer engineering, not with a web form alone.