____________ is the flow of a hazardous material through zippers, pinholes, or other material imperfections found in chemical protective clothing.

• A. Penetration
• B. Permeation
• C. Degradation
• D. Diffusion

Answer: (A)

Penetration is the flow of a hazardous material through zippers, pinholes, or other material imperfections found in chemical protective clothing. This happens when there are physical openings in the garment that allow the chemical to pass through, bypassing the barrier altogether. Permeation, by contrast, is the chemical moving through the intact material at the molecular level—absorbing into the fabric and diffusing through it—without holes. Diffusion is the mechanism that drives permeation, the movement of molecules from higher to lower concentration within the material. Degradation refers to chemical damage to the fabric that weakens its protective properties and can lead to breakthrough, but it doesn’t describe flow through actual openings. So the flow through defects is penetration.