The standard “DIN 53428 Testing of cellular materials - Determination of resistance to liquids, vapors, gases and solids” published by the German Institute for Standardization (DIN) describes a procedure for determining the resistance of cellular materials to liquids, vapors, gases and solids.
The term cellular plastics encompasses a range of materials with a wide range of properties and applications. Virtually any polymer, thermoplastic or thermoset, can be converted into a cellular or foamed form, and the resulting products can have densities ranging from 60 pounds to 0,1 pound per cubic foot.
Essentially, cellular plastics can have one of two structural configurations:
Foams can be rigid, semi-rigid or flexible. In general, the properties of the corresponding plastics are present in foamed products, except of course that they are modified by converting them into a cellular structure.
Cellular plastics can be manufactured as sheets, blocks, plates, molded shapes, and sprayed coatings. Some can also be foamed in situ in an open cavity. The type of process used (casting, extrusion, injection molding) affects the properties of the final product. As originally conceived, most foamed plastics were completely cellular in structure; today, it is possible to arrange the cells so that a product can have an essentially solid skin surface and a cellular core.
Tests according to the DIN 53428 standard are used to determine the changes and behavior of cellular plastics when exposed to liquids, vapors and gases, as well as solids under specified conditions such as temperature, time and pressure. The test methods described are based in particular on the determination of changes in the mass and dimensions of the test specimens, changes in their appearance and, where applicable, changes in other physical properties (e.g. compressive stress).
Comparison between values of changes in mass, dimensions and other changes can only be made when using test specimens of the same dimensions taken under the same conditions (e.g. test specimens with molded surfaces). Except in cases agreed upon, no external forces shall act on the test specimens.
Cellular materials are characterized by their porous microstructures consisting of networks of solids and voids. Cellular materials are a powerful material for applications in the workplace, defense, healthcare, automotive, construction, and aerospace. Cellular solids and porous materials have become multifunctional materials used in a wide variety of commercial, biomedical, industrial, and military applications. This is due to the unusual combination of properties derived from their porous cellular structure with the properties of the materials from which they are made. These materials have a porosity greater than 70 percent and consist of a network of interconnected porous solid supports or plates that form the edges and faces of the pores.
Two phases are observed, a discrete or continuous gas phase (cells or pores) and a continuous solid phase (base material or matrix). Their use contributes to a significant weight reduction and material savings, along with other advantages such as excellent performance in vibration damping, sound attenuation, energy absorption, good filtration ability, catalytic properties and insulation.
Our organization, which has been trying to support businesses from every sector with its testing, measurement, analysis and evaluation studies carried out in a wide range for years, has a strong staff that closely follows the developments in the world in the field of science and technology and constantly improves itself. In this context, testing services in accordance with the standard "DIN 53428 Testing of cellular materials - Determination of resistance to liquids, vapors, gases and solid materials" are also provided to businesses.
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