Autoclave works on which type of objects?

• A. Large metallic objects
• B. Small metallic objects
• C. Small plastic objects
• D. All glassware

Answer: (B)

Autoclaving relies on saturated steam under pressure to kill microbes, so what you’re sterilizing must tolerate high heat and moisture and allow the steam to reach every surface. Small metallic objects are ideal because metal conducts heat well, so they heat up quickly and steam penetrates all surfaces evenly. Their small size also makes it easier to fit them in racks and ensure full contact with steam, leading to reliable sterilization. In contrast, many plastics can warp or melt under autoclave conditions, and some glassware can crack from thermal shock. Large objects can create shadowed areas where steam may not reach, reducing sterilization effectiveness. So, small metallic objects best fit the autoclave’s sterilization mechanism.