Radiation cross-linking comprised of gamma rays from a Co60 source and even high-energy electron cross-linking from > 1 MeV accelerators have been commercial since 1960s. These applications were mostly for the wire and cable industry, rubber tires and some high-barrier shrink film applications for meat packaging introduced by Cryovac. Since the development of low-voltage electron beam accelerators in the range of less than 300 kV – in particular in the 125 kV range – EB cross-linking has found new applications and markets, particularly in the packaging industry. This report will discuss these markets, along with the properties achieved by electron beam irradiation of polyolefin films used in packaging. In addition, theory of electron beam cross-linking will be discussed in detail.