Disposable syringes are an integral part of modern healthcare systems, playing a crucial role in administering medications, 

vaccines, and other fluids into the body. Their design and materials have undergone significant advancements over the years 

to ensure safety, efficiency, and patient comfort. 

The primary material used in the construction of disposable syringes is medical-grade plastic, typically polypropylene (PP). 

Polypropylene is a thermoplastic polymer with excellent chemical resistance, durability, and biocompatibility. It is lightweight 

yet strong, allowing for the creation of syringes that are both robust and easy to handle.

The barrel of the syringe, where the medication is drawn and expelled, is made of polypropylene. This material is chosen 

because it can be molded into precise shapes and sizes, ensuring a smooth and consistent flow of fluid. Polypropylene is

 also resistant to chemicals and biological agents, reducing the risk of contamination or degradation during storage and use.

The plunger, which is used to expel the medication from the syringe, is also made of polypropylene. It is designed to fit snugly 

within the barrel, creating a seal that prevents leakage. The plunger is typically equipped with a rubber tip or seal to further 

enhance its sealing capabilities and ensure a smooth, controlled delivery of medication.

The needle attached to the syringe is made of stainless steel. Stainless steel is chosen for its superior strength, durability, 

and corrosion resistance. It can withstand repeated use and sterilization, making it suitable for disposable syringes that are 

intended for single-use applications. The needle is designed to be sharp and precise, allowing for easy penetration into 

the skin or muscle with minimal discomfort for the patient.

Além do polipropileno e aço inoxidável, outros materiais podem ser usados na construção de seringas descartáveis.

Por exemplo, a seringa pode estar equipada com um cubo de plástico ou um conector que prenda a agulha ao barril. Este centro

é tipicamente feito de um plástico de grau médico tal como polietileno (PE) ou nylon, que é escolhido por sua compatibilidade com

polipropileno e capacidade de suportar esterilização repetida.