The elapsed time between initial contact of a chemical with the outside surface of the protective equipment and detection at the inside surface is called?

• A. Degradation
• B. Permeation
• C. Penetration
• D. Breakthrough time

Answer: (D)

The concept tested is the timing of when a chemical first appears on the inside of protective equipment after contacting the outside surface. Breakthrough time is defined as the elapsed time from initial external contact to the first detection on the inside surface. Permeation describes the overall movement of molecules through the material, including the rate, but it doesn’t specify when detection occurs inside. Degradation refers to damage or loss of material properties, and penetration means the chemical enters through a hole or seam, not through the intact material. So, the elapsed time to inner-surface detection is breakthrough time.