Handbook  of  Cable & Wire  Producer                                 


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Cross Linked Polyethylene (XLPE)

Plastic Type Thermoplastic
Melting Temp 150-170 0C
Density 0,93 g/cm3
Tensile Strength

18 MPa

Dielectric constant 2,2@1MHz
Resistance (ohm.cm)


Polyethylene(PE) is one of the most common thermoplastic that used in cable production. Cross linked Polyethylene is abbreviated either XLPE or PEX.  In cable production XLPE is more common. PE has good electrical properties and a high electric resistivity, that gives it potential for use at much higher voltages than PVC. Plus, cross linking results in better mechanical properties which makes XLPE the most compatible for cable types rated over 0,60/1 kV and higher.

Almost all XLPE used in cable industry is made of LDPE,   cross linking process is turns thermoplastic LDPE to thermoset.  Curing is done after extrusion head.

There are a few different ways to cross link polyethylene.  Irradiating LDPE with an elctron beam is one and it was the first.  Dry silane process is patented in 1974 is the most common.