As a result of radiation treatment, the polyethylene film acquires a "memory effect", in which its geometric dimensions remain in equilibrium. The dimensions of the film during heating and mechanical stress can be increased (stretched) by 1.5 .... 2.5 times and after cooling to room temperature they are fixed for an unlimited time. At the right time, when reheated to a temperature above 120 ° C, the product returns to its original size.
Radiation treatment of polyethylene, in addition, increases mechanical strength, increases heat
resistance, resistance to solvents.
Filling an extrusion plastic film with 5% black carbon increases its resistance to ultraviolet radiation from the sun, which is necessary for onshore pipelines.
Pipe insulation is carried out by winding a radiation-modified composite polyethylene film onto a metal pipe and shrink it by brief heating to a temperature above 120 ° C, after which the metal pipe is insulated, hardened, hermetically protected by a chemically and mechanically strong and elastic layer of polyethylene