What material is the EEBD mask made of?

• A. Carbon
• B. Teflon
• C. Glass
• D. Rubber

Answer: (B)

The mask in an emergency escape breathing device is designed to stay reliable in hazardous and potentially hot or chemically aggressive environments, so the material chosen for the mask body needs to be highly inert and thermally stable. Teflon, or PTFE, fits that need well because it’s extremely chemically resistant and has a wide temperature range, which helps prevent degradation of the mask and maintains a good seal under stress. It also provides a smooth surface that’s comfortable against the skin and less prone to wear over time.

Carbon is primarily used for adsorbing contaminants in the canister, not as the mask material. Glass is brittle and inflexible, making it unsuitable for a form-tight facepiece. Rubber is common for gaskets and flexible components, but it can degrade with certain chemicals and heat, reducing durability of the mask. So, Teflon stands out as the most appropriate material for the EEBD mask due to its inertness and stability in challenging conditions.