(through a barrier) typically describes diffusion-based transport through an, at least semi-permeable, obstacle. Sometimes, the term "barrier penetration" is incorrectly used instead.
Refers to the passage of a chemical through a protective clothing material on a molecular level. Gases may be passing through the material leaving no detectable physical signs of damage to the clothing. Unlike degradation, testing for permeation involves elaborate gas detection instruments. It is the highest level of testing available for protective clothing fabrics. Go to top
The movement of gas through a solid. The process always involves diffusion through the solid and may involve surface phenomena such as dissociation, sorption, desorption and migration.
Movement of substance through a thin film, such as a glove, on a molecular level.
Hydrocarbon vapors that escape to the atmosphere by passing through a solid material.
The process by which a chemical moves through a protective clothing material on a molecular level. Permeation involves the following: Sorption of molecules of the chemical into the contacted (outside) surface of a material. Diffusion of sorbed molecules in the material, and Desorption of the molecules from the opposite (inside) surface of the material into the collecting medium.
A chemical action involving the movement of a chemical, on a molecular level, through intact material.
Permeation, in physics, is the penetration of a substance (permeate) through a solid. Primum mobile is the concentration gradient. Permeability is tested by permeation measurement.