Sterilization Parameters: ethylene_oxide
Sterilization process parameters for medical devices, pharmaceutical equipment, and healthcare facilities. Covers ethylene oxide (EtO standard/low-temp/hospital cartridge), gamma irradiation (VDmax15, VDmax25, substantiation 25 kGy, high dose 35 kGy), electron beam, X-ray, steam autoclave (gravity 121°C, prevacuum 134°C, liquid cycle, terminal, flash, prion), hydrogen peroxide plasma/vapor (VPHP, VHP, accelerated), dry heat (150°C/170°C/HVHA), low-temperature steam formaldehyde (LTSF), ozone, UV-C, and cold plasma. Parameters include temperature, exposure time, radiation dose, gas concentration, relative humidity, sterility assurance level (SAL), material compatibility, and validation standard references.
| sterilization method | process variant | SAL | cycle pressure condition | exposure time max min (min) | exposure time min min (min) | exposure time typical min (min) | gas concentration mg per L max (mg/L) | gas concentration mg per L typical (mg/L) | material compatibility notes | method description | notes | relative humidity pct max (%) | relative humidity pct min (%) | relative humidity pct typical (%) | temperature max C (°C) | temperature min C (°C) | temperature typical C (°C) | validation standard |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| ethylene_oxide | hospital_cartridge | 80 | 1e-6 | 480 | 90 | 240 | 600 | 450 | sub-atmospheric_12_psia | EtO sterilization — small cartridge system for hospitals (Anprolene/3M Steri-Vac) | OSHA 29 CFR 1910.1047; AAMI TIR28 | 50 | 1,000 | 40 | 60 | 37 | 55 | Same material compatibility as industrial EtO; smaller loads; extended aeration time required; 100% EtO cartridges or 10% EtO/90% CO2 mixtures; OSHA 29 CFR 1910.1047 exposure limits apply |
| ethylene_oxide | low_temperature_37C | 80 | 1e-6 | 480 | 90 | 240 | 600 | 450 | sub-atmospheric_10-12_psia | Low-temperature EtO cycle for highly heat-sensitive devices (optics, electronics) | FDA 21 CFR 820 | 55 | 1,000 | 40 | 50 | 37 | 37 | Preferred for temperature-sensitive items; longer cycle time compensates for lower temperature kinetics; all EtO material cautions apply |
| ethylene_oxide | standard_single_dose | 80 | 1e-6 | 360 | 60 | 180 | 700 | 450 | sub-atmospheric_12-15_psia | EtO sterilization at 55°C — most common industrial cycle for heat/moisture sensitive devices | FDA 21 CFR 820; EPA 40 CFR Part 63 Subpart O (NESHAP for EtO) | 60 | 1,200 | 40 | 63 | 50 | 55 | Compatible with most polymers plastics metals; degrades latex natural rubber; attacks polycarbonate; requires aeration post-cycle to remove toxic residuals; EtO is carcinogen — ventilation critical |
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