Cellular rubber
Cellular rubber, made from natural and/or synthetic rubber, is commonly used in industrial settings as a vibration absorber or for sealing.
With its closed-cell structure and lack of an outer skin, cellular rubber is foamed into block form like conventional foam material. Its closed-cell structure renders the material impermeable to water and air, making it highly effective for insulation and sealing purposes.
Cellular rubber is a closed-cell type of rubber that is produced in an expansion process. The cells in the material interior are therefore not connected to each other. In contrast to sponge rubber, cellular rubber consequently does not need an outer skin in order to be used as a seal. The cellular rubber block does have a fabrication skin, which is essentially non-functional however and is removed as a waste product during subsequent processing. Due to the lack of an outer skin, the surface of cellular rubber is more sensitive and easier to damage than that of sponge rubber. Nevertheless, neither gases nor liquids can penetrate the closed cells. Cellular rubber is therefore practically air- and water-tight.
Different mixtures can have an influence on the strength and other properties of the materials. The various natural and/or synthetic rubbers provide the base structure for rubber mixtures. The final properties are determined by further additives such as fillers, softeners, ageing inhibitors, and cross-linking chemicals. Rubber mixtures are differentiated into four main groups.
The macro images on this page are intended to provide an overview of the special features of different foam materials. For the sake of clarifying the differences in cell size and structure, the same image excerpt is used throughout. Of course, many other types are available than those highlighted.
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