What object should not be placed in an autoclave for sterilization?

The glass high-frequency attachment should not be placed in an autoclave for sterilization because glass can withstand high temperatures but may be damaged or broken in the autoclave's high-pressure steam environment. Autoclaves operate by using steam at a high temperature to achieve sterilization, which can cause certain materials, especially delicate or thin glass, to crack or shatter.

In contrast, stainless steel instruments, plastic surgical tools, and wooden spatulas are generally more suitable for autoclaving or have alternative sterilization methods. Stainless steel is specifically designed to endure high heat and pressure. Plastic tools often have guidelines for sterilization; some varieties can be autoclaved if they are heat-resistant. Wooden spatulas can be sanitized through other means, as wood can absorb moisture and may not withstand the autoclave conditions as effectively. Nonetheless, they are not as delicate as glass and can occasionally be sterilized with proper care.