Which material is typically not allowed in medical gas systems?

In medical gas systems, the use of materials that can safely handle gases without degrading or reacting with them is crucial for maintaining safety and effectiveness. Plastic is typically not allowed in these systems due to several critical reasons.

Plastics may not provide the same level of durability and strength needed to withstand the high pressures found in medical gas applications. Additionally, plastics can be permeable to gases over time, which could lead to gas leakage and contamination. Moreover, certain plastics may react adversely with the gases they are intended to transport, potentially leading to chemical reactions that can pose safety risks.

In contrast, brass, copper, and steel possess properties that make them suitable for medical gas systems. They offer strong, durable structures that can withstand high pressures, resist corrosion, and do not react adversely with the gases transported. Therefore, these materials are commonly used in the construction of medical gas piping and components, whereas plastic is generally avoided to ensure the integrity and safety of the system.