Which material is not an acceptable piping material for medical vacuum systems?

Which material is not an acceptable piping material for medical vacuum systems?

• A. Stainless steel
• B. Hard-drawn copper tubing
• C. Glass
• D. Plastic

Answer: (D)

Materials for medical vacuum piping must stay clean, leak-free, and able to withstand sterilization and the rigors of a vacuum environment. Stainless steel meets these needs with its corrosion resistance, smooth interior for easy cleaning, and durability. Hard-drawn copper tubing provides a clean, rigid metal path with a smooth bore that can maintain vacuum integrity when properly fitted. Glass is inert and nonporous, does not react with medical gases, and can be sterilized, making it suitable in some vacuum applications. Plastics, however, often fall short: many plastics permeate gases or moisture, can outgas under vacuum, and may deform or weaken under negative pressure; they’re also harder to sterilize completely and can shed particulates or leach additives. Because of these compatibility and cleanliness concerns, plastic is not acceptable for the main piping in medical vacuum systems.

Materials for medical vacuum piping must stay clean, leak-free, and able to withstand sterilization and the rigors of a vacuum environment. Stainless steel meets these needs with its corrosion resistance, smooth interior for easy cleaning, and durability. Hard-drawn copper tubing provides a clean, rigid metal path with a smooth bore that can maintain vacuum integrity when properly fitted. Glass is inert and nonporous, does not react with medical gases, and can be sterilized, making it suitable in some vacuum applications. Plastics, however, often fall short: many plastics permeate gases or moisture, can outgas under vacuum, and may deform or weaken under negative pressure; they’re also harder to sterilize completely and can shed particulates or leach additives. Because of these compatibility and cleanliness concerns, plastic is not acceptable for the main piping in medical vacuum systems.