In crosslinked PE materials, the polymer chains are interconnected at specific points and form a three-dimensional network. There are two types of crosslinking: a) chemical: crosslinking takes place through additives b) physical: crosslinking takes place through bombardment with electrons Crosslinked PE foam has a fine, regular and closed cell structure. The closed-cell structure offers excellent heat and cold insulation properties. In addition, crosslinked PE foam cannot absorb water. With different color variations, it can be designed in a particularly attractive way, e.g. with precisely fitting milled grooves, and has a smooth surface. Almost all crosslinked PE foams have very good thermoplastic properties. Cross-linked PE foam is also available in particularly bright colors and is therefore very suitable for presentation cases, for example.