intrusion chimique

CONT: Permeation is the most important indicator of the usefulness of a particular chemical protective material. Permeation is the process by which a liquid or gaseous chemical passes through the material at a molecular level. ... The second means of chemical intrusion is degradation. This is the deterioration of the clothing material caused by the action of a chemical. ... Finally, penetration is the flow of a liquid or gaseous chemical through closures, seams, pin-holes or similar types of openings. ... All three of these intrusion methods must be taken into account when choosing protective materials.