Methods

Permeation testing

Permeation tests on plastics are carried out to characterize the penetration or migration behaviour of various substances through a material. These types of tests are important for assessing the suitability of plastics for certain applications, especially when the interaction with different substances, such as gases or liquids, is of great importance.

Permeation behavior, which is usually referred to as diffusion behavior when considering gaseous substances, is influenced both by the substance itself (the so-called permeate) and by the properties of the material to be permeated. In materials science and chemistry, diffusion refers to the process by which molecules or atoms move from an area of high concentration to an area of low concentration. In addition to the oxygen transmission rate (OTR) and water vapor transmission rate (WVTR), we also test the water resistance (WR) of plastics and plastic products. The permeation properties of plastics play a decisive role here. Generally speaking, permeation describes the penetration and permeation of gases or liquids through a material, whereby the chemical composition, thickness and pore size are the main influencing factors on the material side. Permeation and diffusion analyses are therefore indispensable methods for evaluating the barrier effect of plastics and optimizing their use in different environments.

Ulli Eisenhut

Group Manager | Special Services and Expert Reports

Würzburg

+49 931 4104-430

u.eisenhut@skz.de

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Further information

New test option for the gas permeability of hydrogen

You can also find out more about permeation in our white paper

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