There is no assurance that once decontamination of chemical protective clothing is complete, ________ has ceased.

There is no assurance that once decontamination of chemical protective clothing is complete, ________ has ceased.

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

Answer: (A)

The key idea is that surface decontamination only removes what’s on the outside; it doesn’t stop the chemical from moving through the protective material itself. Permeation is the process by which a chemical diffuses through the fabric at the molecular level, and it can continue even after the exterior is decontaminated. The chemical may travel from the outer surface to the inner lining over time, depending on factors like the chemical’s properties, contact duration, temperature, and the fabric’s barrier characteristics. That’s why you can’t assume permeation has stopped just because decontamination is finished. Penetration would require a hole or seam defect for entry, which is a different failure mode. Degradation refers to the material breaking down chemically, potentially compromising protection, but not the ongoing diffusion through intact material. Adsorption is the chemical sticking to the surface, which can desorb later but doesn’t directly describe continuous movement through the material.

The key idea is that surface decontamination only removes what’s on the outside; it doesn’t stop the chemical from moving through the protective material itself. Permeation is the process by which a chemical diffuses through the fabric at the molecular level, and it can continue even after the exterior is decontaminated. The chemical may travel from the outer surface to the inner lining over time, depending on factors like the chemical’s properties, contact duration, temperature, and the fabric’s barrier characteristics. That’s why you can’t assume permeation has stopped just because decontamination is finished.

Penetration would require a hole or seam defect for entry, which is a different failure mode. Degradation refers to the material breaking down chemically, potentially compromising protection, but not the ongoing diffusion through intact material. Adsorption is the chemical sticking to the surface, which can desorb later but doesn’t directly describe continuous movement through the material.