What characteristic do polypropylene syringes possess?

Polypropylene syringes are known for their ability to withstand high temperatures, making them suitable for autoclaving. Autoclaving is a sterilization method that uses steam under pressure to kill bacteria, viruses, and spores, which is essential in ensuring the syringes are free from contaminants before use in medical or laboratory settings.

This characteristic allows healthcare professionals to maintain a high standard of hygiene and safety when using these syringes for various applications. The use of polypropylene as a material contributes to this durability since it has a high melting point compared to other plastics, which means it can endure the rigorous conditions of autoclaving without degrading.

The other options do not accurately describe polypropylene syringes: they are not biodegradable, as polypropylene is a synthetic polymer designed for durability; they are intended for single use or need proper sterilization before reuse, rather than being reusable without sterilization; and they are not heat-sensitive in the sense that they can't withstand high temperatures, which are integral to their ability to be autoclaved.