Which material is typically NOT allowed for piping in medical vacuum systems?

In medical vacuum systems, the use of materials must adhere to stringent safety and health standards to ensure functionality and reliability. Plastic piping is typically not allowed because it can be susceptible to degradation over time due to various environmental factors such as temperature changes and exposure to the vacuum conditions, which can compromise the integrity of the system. Additionally, plastics can be more challenging to disinfect and may not withstand the rigorous cleaning protocols required in a medical setting.

In contrast, brass, galvanized pipe, and black steel pipe are materials that are generally considered acceptable for use in medical vacuum systems. Brass is durable and resistant to corrosion, while galvanized steel offers strength and a degree of corrosion resistance. Black steel pipe is commonly used due to its strength and suitability for gas services. Each of these materials can withstand the conditions of a medical environment, thereby ensuring both safety and efficacy in the delivery of vacuum services.