Crosslinked polyethylenes are either extruded or injection moulded. When degree of crosslinking is deliberately maintained very low, the resulting compound is termed as crosslinkable polymer. Crosslinking can be combined with foaming also. Crosslinking of biopolymers and foaming is very common in food industry. Crosslinking for partially crosslinked extruded profile is commonly employed in furniture. Although crosslinking of thermoplastics such as nylon, polypropylene and styrenics has received attention in literature. Present review is directed to the crosslinking of polyethylenes only. Crosslinkedpolyethylene forms a dense network of high molecular weight, which improves impact strength, environmental stress crack resistance (ESCR), creep and abrasion resistance without influencing tensile strength and density to any appreciable extent. Crosslinked polyethylene finds wide applications in packaging and electrical insulation applications and rotomoulding applications .The degree of crosslinking can applications. Some aspects of crosslinking are
reviewed here.