Dry heat sterilization
Start with the big picture
Hot-air ovens are the most common dry-heat sterilizers, with standard cycles of 160 °C for 120 minutes, 170 °C for 60 minutes, or 180 °C for 30 minutes. Dry heat transfers more slowly than steam, so effective processing depends on a fully dry load, adequate space for air movement, suitable packaging, and sufficient exposure. Glassware, metal instruments, powders, oils, greases, and anhydrous chemicals are suitable; aqueous solutions, culture media, rubber, plastics, and surgical dressings are not. The lesson also introduces alternative methods, biological and chemical monitoring, validation, advantages and limitations, and safe cooling and handling after a cycle.
What you'll learn
- Explain how dry heat destroys microorganisms without moisture.
- Identify standard hot-air oven cycles and alternative dry-heat methods.
- Distinguish suitable items from materials unsuited to dry heat.
- Describe loading, packaging, air circulation, and post-cycle handling considerations.
- Recognize monitoring and validation approaches for dry-heat sterilization.
Continue your study
Work through the complete notes and reinforce the topic with the study tools available in the full lesson.
