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Breakthrough Time: The elapsed time between initial contact of the chemical on the glove surface and the analytical detection on the inside of the glove. Typically expressed as a greater than symbol (>), this shows the test ran for 480 minutes and then stopped. Also may be expressed as "ND" for "None Detected".
Degradation: A change in one or more of the physical properties of a glove due to contact with a chemical. Can appear as a swelling, shrinkage or cracking of the material. Rating example is "E" for excellent, meaning the glove has little or no signs of degradation when exposed to the challenge chemical. A good degradation rating does not guarantee an acceptable breakthrough time.
Permeation Rate: The rate at which a chemical passes through a glove material. The process involves absorption on the glove surface, diffusion of the chemical through the material, and desorption on the inside surface of the glove. This is a complex measurement µg/cm2/MIN (micrograms per square centimeter per minute). This measurement is also limited to the "LDL" or Lower Detection Limit of the equipment used. The example give is .001, but is sometimes expressed as "E" or "P" for excellent or poor.