This process
has been very well known and examined and allowed to control processing parameters e.g. melt flow index [21,22].
The crosslinking of polyethylene with peroxides is also more favored than crosslinking by UV radiation because it is
slower process, needed to use photo-initiators like benzophenone, and a depth of UV polymer penetration is only a few
millimeters [23]. Moreover the peroxide method gives up to 90% degree of crosslinking while radiation crosslinking yields
are between 34% and 75% [24].