Sterilization Parameters: dry_heat
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 | cycle pressure condition | exposure time max min (min) | exposure time min min (min) | exposure time typical min (min) | material compatibility notes | method description | notes | temperature max C (°C) | temperature min C (°C) | temperature typical C (°C) | validation standard |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| dry_heat | high_velocity_hot_air | 1e-6 | 60 | 6 | 30 | atmospheric_forced_convection | High-velocity dry heat — forced convection oven for depyrogenation of glassware/pharmaceutical containers | FDA cGMP 21 CFR 211; USP <1229.2>; PDA TR-3 | 260 | 190 | 250 | Pharmaceuticals — glass vials, ampoules, syringes; combined sterilization and depyrogenation; HVHA reduces cycle time; 250°C/30 min standard for 3-log endotoxin reduction |
| dry_heat | low_temperature_150C | 1e-6 | 180 | 120 | 150 | atmospheric | Dry heat sterilization at 150°C — extended cycle for items intolerant of 160-170°C | USP <1229.2> | 160 | 150 | 150 | Anhydrous oils, petroleum jelly, some wax-based preparations; only material impermeable to steam; limited compatibility advantages over steam except moisture-sensitivity |
| dry_heat | standard_170C | 1e-6 | 120 | 60 | 60 | atmospheric_open_oven | Dry heat sterilization at 170°C — most common depyrogenation/sterilization cycle | USP <1229.2>; FDA Guidance on Dry Heat Depyrogenation | 180 | 160 | 170 | Used for glass, metal, powders, oils, waxes — items damaged by moisture; not for plastics, rubber, fabrics; destroys pyrogens (endotoxin) at 250°C; slower kill than steam |
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